Latest in astro-ph.ga

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Massive star feedback in clusters: variation of the FUV interstellar radiation field in time and spaceJun 13 2019We investigate radiative feedback from a 34 M$_\odot$ star in a $10^4$ M$_\odot$ turbulent cloud using three-dimensional radiation-hydrodynamics (RHD) models. We use Monte Carlo radiative transfer to accurately compute photoionization equilibrium and ... More
Paleo-Detectors for Galactic Supernova NeutrinosJun 13 2019Paleo-detectors are a proposed experimental technique in which one would search for traces of recoiling nuclei in ancient minerals. Natural minerals on Earth are as old as $\mathcal{O}(1)$ Gyr and, in many minerals, the damage tracks left by recoiling ... More
Theoretical Study of Interstellar Heterocyclic MoleculesJun 13 2019Because of their importance in biological systems, in our understanding of the solar system and in other applications, seven heterocycles; furan, imidazole, pyridine, pyrimidine, pyrrole, quinoline and isoquinoline have been astronomically searched for ... More
Cosmic snow clouds: self-gravitating gas spheres manifesting hydrogen condensationJun 13 2019We present hydrostatic equilibrium models of spherical, self-gravitating clouds of helium and molecular hydrogen, focusing on the cold, high-density regime where solid- or liquid-hydrogen can form. The resulting structures have masses from 0.1 Msun down ... More
Resolved neutral carbon emission in nearby galaxies: [CI] Lines as Total Molecular Gas TracersJun 13 2019We present maps of atomic carbon [CI](1-0) and [CI](2-1) at a linear resolution ~1kpc scale for a sample of one HII, six LINER, three Seyfert and five starburst galaxies observed with Herschel. We compare spatial distributions of two [CI] lines with that ... More
When H II Regions are ComplicatedJun 13 2019We argue that photoionisation feedback from massive stars is very efficient at driving outflows from molecular clouds in cases where the peaked density structure around young massive stars is considered at radii between $\sim$0.1 and 10-100 pc. Winds, ... More
Ultimate Merging at z~0.1Jun 13 2019We present a study of 58 double-peaked emission line galaxies for which one of the components is suppressed in [OIII]5008 or significantly weaker than the other one. Accordingly, the two components are classified differently in the BPT diagram. We show ... More
Chemical and radiative transfer modeling of Propylene OxideJun 13 2019The recent identification of the first complex chiral molecule, propylene oxide (PrO) in space opens up a new window to further study the origin of homochirality on the Earth. There are some recent studies to explain the formation of PrO however additional ... More
UBVRI-KC Photometry of NGC~2323 and NGC~2539 Open ClustersJun 13 2019The open clusters NGC 2323 and NGC 2539 have been analysed using CCD UBV(RI)KC photometric data, observed at the San Pedro Martir Observatory. Cluster memberships have been determined with the proper motion and parallax measures from the GaiaDR2 astrometric ... More
A comprehensive and uniform sample of broad-line active galactic nuclei from the SDSS DR7Jun 13 2019A new, complete sample of 14,584 broad-line AGNs at $z<0.35$ is presented, which are uncovered homogeneously from the complete database of galaxies and quasars observed spectroscopically in the Sloan Digital Sky Survey Seventh Data Release. The stellar ... More
The specific angular momentum radial profile in dense cores: improved initial conditions for disk formationJun 13 2019Determination of the specific angular momentum radial profile, $j(r)$, in the early stages of star formation is crucial to constrain star and circumstellar disk formation theories. The specific angular momentum is directly related to the largest Keplerian ... More
HL Tau disk in HCO+ (3-2) and (1-0) with ALMA: gas density, temperature, gap, and one-arm spiralJun 13 2019We present our observational results of the 1.1 mm continuum and the HCO+ (3-2) line in HL Tau at angular resolutions of 0.1" obtained with ALMA and our data analysis of the 2.9 mm and 1.1 mm continuum and the HCO+ (3-2) and (1-0) lines of the HL Tau ... More
Spatially Resolved Water Emission from Gravitationally Lensed Dusty Star Forming Galaxies at z $\sim$ 3Jun 13 2019Water ($\rm H_{2}O$), one of the most ubiquitous molecules in the universe, has bright millimeter-wave emission lines easily observed at high-redshift with the current generation of instruments. The low excitation transition of $\rm H_{2}O$, p$-$$\rm ... More
ALMA observations of molecular gas in the host galaxy of AT2018cowJun 13 2019We investigate the molecular gas in, and star-formation properties of, the host galaxy (CGCG 137-068) of a mysterious transient, AT2018cow, at kpc and larger scales, using archival band-3 data from the Atacama Large Millimeter/submillimeter Array (ALMA). ... More
Dynamical Friction in Interacting Relativistic SystemsJun 12 2019We study dynamical friction in interacting relativistic systems with arbitrary mean free paths and medium constituent masses. Our novel framework recovers the known limits of ideal gas and ideal fluid when the mean free path goes to infinity or zero, ... More
Statistical stellar mass corrections for high-z galaxies observed with JWST broad-band filters due to template degeneraciesJun 12 2019Stellar masses in future James Webb Space Telescope (JWST) deep blank-fields will be mainly derived fitting the spectral energy distribution with theoretical galaxy templates. We investigate the uncertainties and biases of the stellar masses derived by ... More
The energetics of starburst-driven outflows at z=1 from KMOSJun 12 2019We present an analysis of the gas outflow energetics of 529 main-sequence star-forming galaxies at z~1 using KMOS observations of the broad, underlying H-alpha and forbidden lines of [N II] and [S II]. Based on the stacked spectra for a sample with median ... More
ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z\approx 6.2$Jun 12 2019We present kpc-scale ALMA and HST imaging of the quasar PJ308-21 at $z$=$6.2342$, tracing dust, gas (via the [CII] 158 $\mu$m line) and young stars. At a resolution of $\sim0.3''$ ($\approx1.7$ kpc), the system is resolved over $>4''$ ($>$20 kpc). In ... More
Probing the shape of the mixing profile and of the thermal structure at the convective core boundary through asteroseismologyJun 12 2019Aims: We investigate from a theoretical perspective if space asteroseismology can be used to distinguish between different thermal structures and shapes of the near-core mixing profiles for different types of coherent oscillation modes in massive stars ... More
Signatures of stellar accretion in MaNGA early-type galaxiesJun 12 2019The late assembly of massive galaxies is thought to be dominated by stellar accretion in their outskirts (beyond 2 effective radii Re) due to dry, minor galaxy mergers. We use observations of 1010 passive early-type galaxies (ETGs) within z<0.15 from ... More
Variations in $α$-element ratios trace the chemical evolution of the diskJun 12 2019It is well established that the chemical structure of the Milky Way exhibits a bimodality with respect to the $\alpha$-enhancement of stars at a given [Fe/H]. This has been studied largely based on a bulk $\alpha$ abundance, computed as a summary of several ... More
A Correlated Search for Local Dwarf Galaxies in GALFA-HI and Pan-STARRSJun 12 2019In recent years, ultrafaint dwarf (UFD) galaxies have been found through systematic searches of large optical surveys. However, the existence of Leo T, a nearby gas-rich dwarf, suggests that there could be other nearby UFDs that are optically obscured ... More
Linear Analysis of the Nonaxisymmetric Secular Gravitational InstabilityJun 12 2019In protoplanetary discs (PPDs) consisting of gas and dust particles, fluid instabilities induced by the drag force, including secular gravitational instability (SGI) can facilitate planet formation. Although SGI subject to the axisymmetric perturbations ... More
Flying far and fast: the distribution of distant hypervelocity star candidates from Gaia DR2 dataJun 12 2019Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000 km/s. These can be easily induced at the ... More
A novel analytical model of the magnetic field configuration in the Galactic CenterJun 12 2019The magnetic field in the Galactic Center (GC) is challenging to measure in detail due to its large distance in combination with a difficult foreground estimate. More precise knowledge is, however, required in particular in the context of proper modeling ... More
Galactic rotation curves in Einstein's conformal gravityJun 12 2019We show quantitatively that an exact solution of Einstein's conformal gravity can explain very well the galactic rotation curves for a sample of 104 galaxies without need for dark matter or other exotic modification of gravity. The metric is an overall ... More
A Very Large Array Survey of Luminous Extranuclear Star-forming Regions in Luminous Infrared Galaxies in GOALSJun 12 2019We present the first results of a high-resolution Karl G. Jansky Very Large Array (VLA) imaging survey of luminous and ultra-luminous infrared galaxies (U/LIRGs) in the Great Observatories All-Sky LIRG Survey (GOALS). From the full sample of 68 galaxies, ... More
The Mass Function of Supermassive Black Holes in the Direct-collapse ScenarioJun 12 2019One of the ideas to explain the existence of supermassive black holes (SMBH) that are in place by z~7 is that there was an earlier phase of very rapid accretion onto direct collapse black holes (DCBH) that started their lives with masses ~ 10^4-10^5 M_solar. ... More
Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE gamma-ray observations with H.E.S.SJun 12 2019The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy ($100\,$MeV$<E<100\,$GeV) $\gamma$-ray band, which is continuously monitored with Fermi-LAT. During two periods of high activity in April 2014 and June ... More
Gravitational scalar field with a RAQUAL-like cubic kinetic term and second order self-interactionJun 12 2019The consequences of two unorthodox contributions to the Lagrangian of a (real valued) relativistic scalar field are studied: a cubic kinetic term similar to the "a-quadratic" Lagrangian used in the first attempt of a covariant generalization of Milgrom's ... More
Multiple Stellar Populations in NGC 2808: a Case Study for Cluster AnalysisJun 12 2019In the massive globular cluster NGC 2808, RGB stars form at least five distinct groups in the so-called chromosome map photometric plane, arguably corresponding to different stellar populations. While a human expert can separate the groups by eye relatively ... More
Circumnuclear rings and Lindblad resonances in spiral galaxiesJun 11 2019In order to study the location of circumnuclear rings (CNR) and their possible relation with the inner Lindblad resonances (ILR), we investigate a sample of spiral galaxies. For this purpose, we have obtained and analyzed medium resolution spectra of ... More
Effects of the magnetic field direction on the Tsallis statisticJun 11 2019We extend the use of the Tsallis statistic to measure the differences in gas dynamics relative to the mean magnetic field present from natural eddy-type motions existing in magnetohydrodynamical (MHD) turbulence. The variation in gas dynamics was estimated ... More
Kinetics and clustering of dust particles in supersonic turbulence with self-gravityJun 11 2019We present a simulation of isothermal supersonic (rms Mach number $\mathcal{M}_{\rm rms} \sim 3$) turbulent gas with inertial particles (dust) and self-gravity in statistical steady-state, which we compare with a corresponding simulation without self-gravity. ... More
Detailed chemical composition and orbit of the new globular cluster FSR1758: Implications for the accretion of the Sequoia dwarf galaxy onto the Milky WayJun 11 2019We present detailed chemical abundances, radial velocities and orbital parameters for FSR 1758, a recently discovered star cluster in the direction of the Galactic Bulge. High resolution (R~42,000) spectra were obtained using the Magellan/Clay telescope ... More
CMB foreground measurements through broad-band radio spectro-polarimetry: prospects of the SKA-MPG telescopeJun 11 2019Precise measurement of the foreground synchrotron emission, which contaminates the faint polarized cosmic microwave background radiation (CMB), is a major challenge for the next-generation of CMB experiments. To address this, dedicated foreground measurement ... More
Identifying resonances of the Galactic bar in Gaia DR2: Clues from action spaceJun 11 2019Action space synthesizes the orbital information of stars and is well-suited to analyse the rich amount of kinematic disk substructure in the Gaia DR2 radial velocity sample (RVS). In this work, we revisit one of the strongest perturbers in the Milky ... More
Globular clusters as probes of dark matter cusp-core transformationsJun 11 2019Bursty star formation in dwarf galaxies can slowly transform a steep dark matter cusp into a constant density core. We explore the possibility that globular clusters (GCs) retain a dynamical memory of this transformation. To test this, we use the nbody6df ... More
Star-forming clumps in the Lyman Alpha Reference Sample of galaxies -- I. Photometric analysis and clumpinessJun 11 2019We study young star-forming clumps on physical scales of 10-500 pc in the Lyman-Alpha Reference Sample (LARS), a collection of low-redshift (z = 0.03-0.2) UV-selected star-forming galaxies. In each of the 14 galaxies of the sample, we detect clumps for ... More
Inquiring into the nature of the Abell 2667 Brightest Cluster Galaxy: physical properties from MUSEJun 11 2019Based on HST and MUSE data, we probe the stellar and gas properties (i.e. kinematics, stellar mass, star formation rate) of the radio-loud brightest cluster galaxy (BCG) located at the centre of the X-ray luminous cool core cluster Abell 2667 (z = 0.2343). ... More
The GIST Pipeline: A Multi-Purpose Tool for the Analysis and Visualisation of (Integral-field) Spectroscopic DataJun 11 2019We present a convenient, all-in-one framework for the scientific analysis of fully reduced, (integral-field) spectroscopic data. The GIST pipeline (Galaxy IFU Spectroscopy Tool) is entirely written in Python3 and conducts all steps from the preparation ... More
Double-peaked OI profile: a likely signature of the gaseous ring around KH 15DJun 11 2019KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring but the ring itself was never directly detected. We present a new interpretation of the double-peaked ... More
The complex chemistry of hot cores in Sagittarius B2(N): Influence of cosmic-ray ionization and thermal historyJun 11 2019As the number of complex organic molecules (COMs) detected in the interstellar medium increases, it becomes important to place meaningful constraints on the formation pathways of these species. The molecular cloud SgrB2(N) is host to several hot molecular ... More
Re-exploring Molecular Complexity with ALMA (ReMoCA): Interstellar detection of ureaJun 11 2019Urea, NH2C(O)NH2, is a molecule of great importance in organic chemistry and biology. Two searches for urea in the interstellar medium were reported in the past, but neither were conclusive. We want to take advantage of the increased sensitivity and angular ... More
Halpha Nuclear Geyser (Bipolar Outflow) from the Barred Galaxy NGC 1415 (ESO 482-G033)Jun 11 2019A long slit spectrum from the barred galaxy NGC 1415 has been obtained with the 2.1m Guillermo Haro telescope in Cananea, Mexico at position angle 155d (EofN) and shows the kinematics of Na I D lines (in absorption) and Halpha, 6562.8 A, [NII] 6548 A, ... More
Can we believe the strong-line abundances in giant HII regions and emission-line galaxies?Jun 11 2019This review is not a compendium of strong-line methods to derive abundances in giant HII regions. It is mostly intended for readers who wish to use such methods but do not have a solid background on the physics of HII regions. It is also meant to encourage ... More
Extremely High energy peaked BL Lac nature of the TeV blazar Mrk 501Jun 11 2019Extremely High energy peaked BL Lac (EHBL) objects are a special class of blazars with peculiar observational properties at X-ray and $\gamma$--ray energies. The observations of these sources indicate hard X-ray and $\gamma$--ray spectra and absence of ... More
Reddening map and recent star formation {\bf in the} Magellanic Clouds based on OGLE IV CepheidsJun 11 2019In the present study, we examine reddening distribution across the LMC and SMC through largest data on Classical Cepheids provided by the OGLE Phase IV survey. The V and I band photometric data of 2476 fundamental mode (FU) and 1775 first overtone mode ... More
Identifying Galactic Halo Substructure in 6D Phase-space Using $\sim$13,000 LAMOST K GiantsJun 11 2019We construct a large halo K-giant sample by combining the positions, distances, radial velocities, and metallicities of over 13,000 LAMOST DR5 halo K giants with the Gaia DR2 proper motions, which covers a Galactocentric distance range of 5-120 kpc. Using ... More
The metallicity sensitivity of a surface brightness temperature scaleJun 10 2019To obtain the accuracy now sought in the extragalactic distance scale through standard candles and rulers, calibration of stellar photometry must be improved. The sensitivity of the V-K color surface brightness relation is examined here by means of model ... More
No signs of star formation being regulated in the most luminous quasars at z~2 with ALMAJun 10 2019We present ALMA Band~7 observations at $850\mu$m of 20 luminous ($\log\, L_{\rm bol}>46.9$ [erg s$^{-1}$]) unobscured quasars at $z\sim2$. We detect continuum emission for 19/20 quasars. After subtracting an AGN contribution, we measure the total far-IR ... More
Discovery of the first heavily obscured QSO candidate at $z>6$ in a close galaxy pairJun 10 2019While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting $z>6$ quasars (QSOs) are strongly biased against obscured QSOs, ... More
Ultra light Thomas-Fermi Dark MatterJun 10 2019We investigate the viability of a simple dark matter (DM) model consisting of a single fermion in the context of galactic dynamics. We use a consistent approach that does not presume a particular DM density profile but instead requires that the DM+baryon ... More
Antlia2's role in driving the ripples in the outer gas disk of the GalaxyJun 10 2019We employ the observed Gaia proper motions of the newly discovered Antlia 2 dwarf galaxy to calculate its orbital distribution in the cosmologically recent past. Using these observationally motivated orbits, we calculate the effect of the Antlia 2 dwarf ... More
Classifying galaxies according to their HI contentJun 10 2019We use machine learning to classify galaxies according to their HI content, based on both their optical photometry and environmental properties. The data used for our analyses are the outputs in the range $z = 0-1$ from MUFASA cosmological hydrodynamic ... More
Maximally Rotating Supermassive Stars at the Onset of Collapse: Effects of Gas PressureJun 10 2019Jun 12 2019The "direct collapse" scenario has emerged as a promising evolutionary track for the formation of supermassive black holes early in the Universe. In an idealized version of such a scenario, a uniformly rotating supermassive star spinning at the mass-shedding ... More
Spiral instabilities: Mechanism for recurrenceJun 10 2019We argue that self-excited instabilities are the cause of spiral patterns in simulations of unperturbed stellar discs. In previous papers, we have found that spiral patterns were caused by a few concurrent waves, which we claimed were modes. The superposition ... More
Maximally Rotating Supermassive Stars at the Onset of Collapse: Effects of Gas PressureJun 10 2019The "direct collapse" scenario has emerged as a promising evolutionary track for the formation of supermassive black holes early in the Universe. In an idealized version of such a scenario, a uniformly rotating supermassive star spinning at the mass-shedding ... More
The possible hierarchical scales of observed clumps in high-redshift disc galaxiesJun 10 2019Giant clumps on ~kpc scales and with masses of 10^8-10^9 Msol are ubiquitous in observed high-redshift disc galaxies. Recent simulations and observations with high spatial resolution indicate the existence of substructure within these clumps. We perform ... More
Characterizing the Infall Times and Quenching Timescales of Milky Way Satellites with $Gaia$ Proper MotionsJun 10 2019Observations of low-mass satellite galaxies in the nearby Universe point towards a strong dichotomy in their star-forming properties relative to systems with similar mass in the field. Specifically, satellite galaxies are preferentially gas poor and no ... More
3D simulations of clump formation in stellar wind collisionsJun 10 2019The inner parsec of our Galaxy contains tens of Wolf-Rayet stars whose powerful outflows are constantly interacting while filling the region with hot, diffuse plasma. Theoretical models have shown that, in some cases, the collision of stellar winds can ... More
An observational link between AGN Eddington ratio and [NII]λ6583/Ha at 0.6<z<1.7Jun 10 2019We present an observed relationship between Eddington ratio ({\lambda}Edd) and optical narrow-emission-line ratio ([N II]{\lambda}6583/H{\alpha}) of X-ray-selected broad-line active galactic nuclei (AGN) at 0.6 < z < 1.7. We use 27 near-infrared spectra ... More
A 5D view of the Alpha Per, Pleiades, and Praesepe clustersJun 10 2019Aims: Our scientific goal is to provide revised membership lists of the Alpha Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (ra, dec, parallax, pmRA, pmDEC) of these clusters. Methods: ... More
Anatomy of a buckling galactic barJun 10 2019Using $N$-body simulations we study the buckling instability in a galactic bar forming in a Milky Way-like galaxy. The galaxy is initially composed of an axisymmetric, exponential stellar disk embedded in a spherical NFW dark matter halo. The parameters ... More
Chemical and Kinematic Properties of the Galactic Disk from the LAMOST and Gaia Sample StarsJun 10 2019We determined the chemical and kinematic properties of the Galactic thin and thick disk using a sample of 307,246 A/F/G/K-type giant stars from the LAMOST spectroscopic survey and Gaia DR2 survey. Our study found that the thick disk globally exhibits ... More
RadioGAN - Translations between different radio surveys with generative adversarial networksJun 10 2019Radio surveys are widely used to study active galactic nuclei. Radio interferometric observations typically trade-off surface brightness sensitivity for angular resolution. Hence, observations using a wide range of baseline lengths are required to recover ... More
Targeted search for young radio pulsars in the SMC: Discovery of two new pulsarsJun 10 2019We report the first rotation powered pulsars discovered in the Small Magellanic Cloud (SMC) in more than a decade. PSR J0043-73 and PSR J0052-72 were discovered during a Parkes Multi-Beam (PMB) survey of MCSNR J0127-7332, and five new, optically selected, ... More
Dynamical properties of binary stars hosting planets in the Galactic CenterJun 09 2019We present some preliminary results of our work about the close encounter of binary stars hosting planets on S-type orbits with the Sgr A* supermassive black hole in the center of our Galaxy.
GASP XVII. HI imaging of the jellyfish galaxy JO206: gas stripping and enhanced star formationJun 09 2019We present VLA HI observations of JO206, a prototypical ram-pressure stripped galaxy in the GASP sample. This massive galaxy (M$_{\ast} =$ 8.5 $\times$ 10$^{10}$ M$_{\odot}$) is located at a redshift of $z =$ 0.0513, near the centre of the low-mass galaxy ... More
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic CloudsJun 09 2019Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the Weak Equivalence ... More
A 6.7 GHz Methanol Maser Survey II. Low Galactic LatitudesJun 09 2019We report the results of our systematic survey for Galactic 6.7 GHz Class II CH$_3$OH maser emission toward a sample of young stellar objects. The survey was conducted with the Shanghai Tianma Radio Telescope (TMRT). The sample consists of 3348 sources ... More
Warm gas in protostellar outflows. II. EHV jet and outflows from OMC-2/3Jun 08 2019OMC-2/3 is one of the nearest embedded cluster-forming region that includes intermediate-mass protostars at early stages of evolution. A previous CO (3--2) mapping survey towards this region revealed outflow activity related to sources at different evolutionary ... More
JCMT BISTRO Survey observations of the Ophiuchus Molecular Cloud: Dust grain alignment properties inferred using a Ricean noise modelJun 08 2019The dependence of polarization fraction $p$ on total intensity $I$ in polarized submillimeter emission measurements is typically parameterized as $p\propto I^{-\alpha}$ $(\alpha \leq 1)$, and used to infer dust grain alignment efficiency in star-forming ... More
The search for multiple populations in Magellanic Clouds clusters - V. Correlation between cluster age and abundance spreadsJun 07 2019In our HST photometric survey, we have been searching for multiple stellar populations (MPs) in Magellanic Clouds (MCs) massive star clusters which span a significant range of ages ($\sim 1.5-11$ Gyr). In the previous papers of the series, we have shown ... More
Efficient Production of Sound Waves by AGN Jets in the Intracluster MediumJun 07 2019We investigate the interaction between active galactic nuclei (AGN) jets and the intracluster medium (ICM) of galaxy clusters. Specifically, we study the efficiency with which jets can drive sound waves into the ICM. Previous works focused on this issue ... More
A Census Star Formation in the Outer Galaxy: the SMOG fieldJun 07 2019In this paper we undertake a study of the 21 square degree SMOG field, a Spitzer cryogenic mission Legacy program to map a region of the outer Milky Way towards the Perseus and Outer spiral arms with the IRAC and MIPS instruments. We identify 4648 YSOs ... More
A new formulation of the external field effect in MOND and numerical simulations of ultra-diffuse dwarf galaxies $-$ application to NGC 1052-DF2 and NGC 1052-DF4Jun 07 2019The ultra-diffuse dwarf galaxy NGC 1052-DF2 (DF2) has ten (eleven) measured globular clusters (GCs) with a line-of-sight velocity dispersion of $\sigma=7.8^{+5.2}_{-2.2}\,$km/s ($\sigma=10.6^{+3.9}_{-2.3}\,$km/s). Our conventional statistical analysis ... More
Detecting Thin Stellar Streams in External Galaxies: Resolved Stars & Integrated LightJun 07 2019The morphology of thin stellar streams can be used to test the nature of dark matter. It is therefore crucial to extend searches for globular cluster streams to other galaxies than the Milky Way. In this paper, we investigate the current and future prospects ... More
The M101 Satellite Luminosity Function and the Halo to Halo Scatter Among Milky Way AnaloguesJun 07 2019We have obtained deep Hubble Space Telescope (HST) imaging of 19 dwarf galaxy candidates in the vicinity of M101. Advanced Camera for Surveys HST photometry for 2 of these objects showed resolved stellar populations and Tip of the Red Giant Branch derived ... More
Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formationJun 07 2019Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we study the structure of massive clumps at different scales, analyze the fragmentation process, and investigate the possibility ... More
An adaptive scheduling tool to optimize measurements to reach a scientific objective: methodology and application to the measurements of stellar orbits in the Galactic CenterJun 07 2019In various fields of physics and astronomy, access to experimental facilities or to telescopes is becoming more and more competitive and limited. It becomes therefore important to optimize the type of measurements and their scheduling to reach a given ... More
Non-thermal desorption of complex organic moleculesJun 07 2019The occurrence of complex organic molecules (COMs) in the gas phase at low temperature in the dense phases of the ISM suggests that a non-thermal desorption mechanism is at work because otherwise, COMs should condense within a short timescale onto dust ... More
The future Milky Way and Andromeda galaxy mergerJun 07 2019According to our current knowledge about physical and dynamical properties of the Milky Way-M31 system, it seems likely that these two galaxies will collide and eventually merge in a time very sensitive to initial conditions. Using the HiGPUs code, we ... More
SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxyJun 07 2019As hybrids of narrow-line Seyfert 1 (NLS1) galaxies and blazars, {\gamma}-ray emitting NLS1s are important probes of jet physics in the high Eddington-ratio regime. Only very few of them are known to date; the majority of them below redshift z = 0.5. ... More
Multiphase quasar-driven outflows in PG 1114+445. I. Entrained ultra-fast outflowsJun 06 2019Substantial evidence in the last few decades suggests that outflows from supermassive black holes (SMBH) may play a significant role in the evolution of galaxies. Large-scale outflows known as warm absorbers (WA) and fast disk winds known as ultra-fast ... More
Multiple components of the Jhelum stellar streamJun 06 2019In simple models of the Milky Way, tidally disrupting satellites produce long and thin---nearly one-dimensional---stellar streams. Using astrometric data from the Gaia second data release and photometry from the Dark Energy Survey, we demonstrate that ... More
The relationship between black hole mass and galaxy properties: Examining the black hole feedback model in IllustrisTNGJun 06 2019Supermassive black hole feedback is thought to be responsible for the lack of star formation, or quiescence, in a significant fraction of galaxies. We explore how observable correlations between the specific star formation rate (sSFR), stellar mass (M$_{\rm{star}}$), ... More
The role of atom tunneling in gas-phase reactions in planet-forming disksJun 06 2019This paper investigates the impact of the increased reaction rate constant due to tunneling effects on planet-forming disks. Our aim is to quantify the astrophysical implications of atom tunneling for simple molecules that are frequently used to infer ... More
The Evolution and Origin of Ionized Gas Velocity Dispersion from $z\sim2.6$ to $z\sim0.6$ with KMOS$^{\rm 3D}$Jun 06 2019We present the $0.6<z<2.6$ evolution of the ionized gas velocity dispersion in 175 star-forming disk galaxies based on data from the full KMOS$^{\rm 3D}$ integral field spectroscopic survey. In a forward-modelling Bayesian framework including instrumental ... More
Inferring black hole spins and probing accretion/ejection flows in AGNs with the Athena X-ray Integral Field UnitJun 06 2019Active Galactic Nuclei (AGN) display complex X-ray spectra which exhibit a variety of emission and absorption features, that are commonly interpreted as a combination of i) a relativistically smeared reflection component, resulting from the irradiation ... More
Dust properties and star formation of about a thousand local galaxiesJun 06 2019[ABRIDGED] We derive the dust properties for 753 local galaxies and examine how these relate to some of their physical properties. We model their global dust-SEDs, treated statistically as an ensemble within a hierarchical Bayesian dust-SED modeling approach. ... More
Star Formation Efficiency in Low Surface Brightness RegionsJun 06 2019Low surface brightness regions are found not only in dwarf and ultra-diffuse galaxies, but also on the outer parts of giant spirals, or in galaxy extensions (tidal or ram-pressure tails, outflows or jets). Sometimes molecular gas is detected in sufficient ... More
The impact of inhomogeneous subgrid clumping on cosmic reionizationJun 06 2019Cosmic reionization was driven by the imbalance between early sources and sinks of ionizing radiation, both of which were dominated by small-scale structure and are thus usually treated in cosmological reionization simulations by subgrid modelling. The ... More
SOFIA Far-infrared [O III] and [O I] Observations of Dense CO-knots in the Supernova Remnant Cassiopeia A: Multi-phase EjectaJun 06 2019Dense, fast-moving ejecta knots in supernova remnants are prime sites for molecule and dust formation. We present SOFIA far-IR spectrometer FIFI-LS observations of CO-rich knots in Cas A which cover a ~1 square arc minute area of the northern shell, in ... More
The [CII]/[NII] ratio in 3 < z < 6 sub-millimetre galaxies from the South Pole Telescope surveyJun 05 2019We present Atacama Compact Array and Atacama Pathfinder Experiment observations of the [N II] 205 $\mu$m fine-structure line in 40 sub-millimetre galaxies lying at redshifts z = 3 to 6, drawn from the 2500 deg$^2$ South Pole Telescope survey. This represents ... More
The EDGE-CALIFA Survey: Exploring the Star Formation Law through Variable SelectionJun 05 2019We present a multilinear analysis to determine the significant predictors of star formation in galaxies using the combined EDGE-CALIFA sample of galaxies. We analyze 1845 kpc-scale lines of sight across 39 galaxies with molecular line emission measurements ... More
The EDGE-CALIFA Survey: Exploring the Star Formation Law through Variable SelectionJun 05 2019Jun 07 2019We present a multilinear analysis to determine the significant predictors of star formation in galaxies using the combined EDGE-CALIFA sample of galaxies. We analyze 1845 kpc-scale lines of sight across 39 galaxies with molecular line emission measurements ... More
Microlensing optical depth and event rate toward the Galactic bulge from eight years of OGLE-IV observationsJun 05 2019The number and properties of observed gravitational microlensing events depend on the distribution and kinematics of stars and other compact objects along the line of sight. In particular, precise measurements of the microlensing optical depth and event ... More
Insights into formation scenarios of massive Early-Type galaxies from spatially resolved stellar population analysis in CALIFAJun 05 2019We perform spatially resolved stellar population analysis for a sample of 69 early-type galaxies (ETGs) from the CALIFA integral field spectroscopic survey, including 48 ellipticals and 21 S0's. We generate and quantitatively characterize profiles of ... More
The dust content of the Crab NebulaJun 05 2019We have modelled the near-infrared to radio images of the Crab Nebula with a Bayesian SED model to simultaneously fit its synchrotron, interstellar and supernova dust emission. We infer an interstellar dust extinction map with an average $A_{\text{V}}$=1.08$\pm$0.38 ... More