Latest in astro-ph.ga

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What Determines the Sizes of Bars in Spiral Galaxies?Aug 22 2019I use volume- and mass-limited subsamples and recently published data from the Spitzer Survey of Stellar Structure in Galaxies (S4G) to investigate how the size of bars depends on galaxy properties. The known correlation between bar semi-major-axis $a$ ... More
ALMA CO Observations of a Giant Molecular Cloud in M33: Evidence for High-Mass Star Formation Triggered by Cloud-Cloud CollisionsAug 22 2019We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M33 using ... More
Properties of barred galaxies in the MaNGA galaxy surveyAug 22 2019We present the initial results of a census of 684 barred galaxies in the MaNGA galaxy survey. This large sample contains galaxies with a wide range of physical properties, and we attempt to link bar properties to key observables for the whole galaxy. ... More
A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-ray Transient with a Strong Oxygen Line in NGC 6946Aug 22 2019We discovered and studied an ultraluminous X-ray source (CXOU J203451.1+601043) that appeared in the spiral galaxy NGC 6946 at some point between 2008 February and 2012 May, and has remained at luminosities $\approx$2-4 $\times 10^{39}$ erg s$^{-1}$ in ... More
Into the Darkness: Classical and Type II Cepheids in the Zona Galactica IncognitaAug 22 2019The far side of the Milky Way's disk is one of the most concealed parts of the known Universe due to extremely high interstellar extinction and point source density toward low Galactic latitudes. Large time-domain photometric surveys operating in the ... More
Constraints on Quasi-dilaton Massive GravityAug 22 2019The last decade has seen great advancements in the field of modified gravity, motivated by the dark energy problem, or by the search for a fundamental quantum gravity theory. With a phenomenologically-driven approach, we consider dRGT theory and its extension, ... More
Not so different after all: Properties and Spatial Structure of Column Density Peaks in the Pipe and Orion A CloudsAug 22 2019We present a comparative study of the physical properties and the spatial distribution of column density peaks in two Giant Molecular Clouds (GMC), the Pipe Nebula and Orion A, which exemplify opposite cases of star cluster formation stages. The density ... More
HII versus HI in the `green valley' galaxies: direct comparisonAug 21 2019We study the morphology and kinematics of the ionization state of the gas in four 'green valley' early-type galaxies at different stages of their transition from a 'blue cloud' of star-forming galaxies to the sequence of passive evolution. The previous ... More
X-ray properties of z>4 blazarsAug 21 2019We present the X-ray analysis of the largest flux-limited complete sample of blazar candidates at z>4 selected from the Cosmic Lens All Sky Survey (CLASS). After obtaining a nearly complete (24/25) X-ray coverage of the sample (from Swift-XRT, XMM-Newton ... More
Consistency of the Infrared Variability of Sgr A* over 22 yearsAug 21 2019We report new infrared measurements of the supermassive black hole at the Galactic Center, Sgr A*, over a decade that was previously inaccessible at these wavelengths. This enables a variability study that addresses variability timescales that are ten ... More
Impact of Cosmic-Ray Feedback on Accretion and Chemistry in Circumstellar DisksAug 21 2019We use the gas-grain chemistry code UCLCHEM to explore the impact of cosmic-ray feedback on the chemistry of circumstellar disks. We model the attenuation and energy losses of the cosmic-rays as they propagate outwards from the star and also consider ... More
Bias to CMB lensing from lensed foregroundsAug 21 2019Extragalactic foregrounds are known to constitute a limiting systematic in temperature-based CMB lensing with AdvACT, SPT-3G, Simons Observatory and CMB S4. Furthermore, since these foregrounds are emitted at cosmological distances, they are also themselves ... More
The Progenitors of Calcium-Strong TransientsAug 21 2019A new class of faint, spectroscopically peculiar transients has emerged in the last decade. We term these events "calcium-strong transients" (CaSTs) because of their atypically high calcium-to-oxygen nebular line ratios. Previous studies have struggled ... More
Structural and Stellar Population Properties vs. Bulge Types in Sloan Digital Sky Survey Central GalaxiesAug 21 2019This paper studies pseudo-bulges (P-bulges) and classical bulges (C-bulges) in Sloan Digital Sky Survey central galaxies using the new bulge indicator $\Delta\Sigma_1$, which measures relative central stellar-mass surface density within 1 kpc. We compare ... More
The case of NGC 6302: The impact of shocks in the derivation of Nitrogen abundancesAug 21 2019High nitrogen abundance is characteristic of Type I planetary nebulae as well as their highly filamentary structure. In the present work we test the hypothesis of shocks as a relevant excitation mechanism for a Type-I nebula, NGC 6302, using recently ... More
Modeling the Gaia Color-Magnitude Diagram with Bayesian Neural Flows to Constrain Distance EstimatesAug 21 2019We demonstrate an algorithm for learning a flexible color-magnitude diagram from noisy parallax and photometry measurements using a normalizing flow, a deep neural network capable of learning an arbitrary multi-dimensional probability distribution. We ... More
Counter-Rotation and High Velocity Outflow in the Parsec-Scale Molecular Torus of NGC 1068Aug 21 2019We present 1.4 pc resolution observations of 256 GHz nuclear radio continuum and HCN ($J=3 \to 2$) in the molecular torus of NGC 1068. The integrated radio continuum emission has a flat spectrum consistent with free-free emission and resolves into an ... More
Main trends of the quasar main sequence -- effect of viewing angleAug 21 2019We address the effect of the viewing angle of the accretion disk plane and the geometry of the broad-line region (BLR) with the goal of interpreting the distribution of quasars along the main sequence (MS). We utilize photoionization code CLOUDY to model ... More
Rotating baryonic dark halosAug 21 2019Galactic halos are of great importance for our understanding of both the dark matter nature and primordial non-Gaussianity in the perturbation spectrum, a powerful discriminant of the physical mechanisms that generated the cosmological fluctuations observed ... More
Spitzer catalog of Herschel-selected ultrared dusty, star-forming galaxiesAug 21 2019The largest Herschel extragalactic surveys, H-ATLAS and HerMES, have selected a sample of "ultrared" dusty, star-forming galaxies (DSFGs) with rising SPIRE flux densities ($S_{500} > S_{350} > S_{250}$; so-called "500 $\mu$m-risers") as an efficient way ... More
Graphene Oxide Nanoparticles in the Interstellar MediumAug 21 2019Dust particles play a major role in the formation, evolution and chemistry of interstellar clouds, stars and planetary systems. Commonly identified forms include amorphous and crystalline carbon-rich particles and silicates. Also present in many astrophysical ... More
Stellar population astrophysics (SPA) with the TNG. GIANO-B spectroscopy of red supergiants in Alicante 7 and Alicante 10Aug 21 2019The Scutum complex in the inner disk of the Galaxy hosts a number of young clusters and associations of red supergiant stars that are heavily obscured by dust extinction. These stars are important tracers of the recent star formation and chemical enrichment ... More
The ALPINE-ALMA [CII] Survey: A Triple Merger at z~4.56Aug 21 2019We report the detection of [CII]158um emission from a system of three closely-separated sources in the COSMOS field at z~4.56, as part of the ALMA Large Program to INvestigate CII at Early times (ALPINE). The two dominant sources are closely associated, ... More
Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum inter-band delaysAug 21 2019We investigate the contribution of reprocessed continuum emission (1000A - 10,000A) originating in broad line region (BLR) gas, the diffuse continuum (DC), to the wavelength-dependent continuum delays measured in AGN disk reverberation mapping experiments. ... More
First clear detection of the CCS Zeeman splitting toward the pre-stellar core, Taurus Molecular Cloud-1Aug 21 2019We report a first clear detection of the Zeeman splitting of a CCS emission line at 45 GHz toward a nearby prestellar dense filament, Taurus Molecular Cloud-1. We observed HC$_3$N non-Zeeman line simultaneously as the CCS line, and did not detect any ... More
A wind-based unification model for NGC 5548: spectral holidays, non-disk emission, and implications for changing-look quasarsAug 21 2019The 180-day Space Telescope and Optical Reverberation Mapping campaign on NGC 5548 discovered an anomalous period, the broad-line region (BLR) holiday, in which the emission lines decorrelated from the continuum variations. This is important since the ... More
The COS Absorption Survey of Baryon Harbors: The Galaxy Database and Cross-Correlation Analysis of OVI SystemsAug 21 2019We describe the survey for galaxies in the fields surrounding 9 sightlines to far-UV bright, z~1 quasars that define the COS Absorption Survey of Baryon Harbors (CASBaH) program. The photometry and spectroscopy that comprise the dataset come from a mixture ... More
Siblings, friends and acquaintances: Testing galaxy association methodsAug 20 2019In order to constraint the limitations of association methods applied to galaxy surveys, we analysed the catalogue of halos at $z=0$ of a cosmological simulation, trying to reproduce the limitations that an observational survey deal with. We focused in ... More
Runaway Young Stars in the Orion NebulaAug 20 2019The star forming region of the Orion Nebula (ONC) is ideal to study the stellar dynamics of young stars in a clustered environment. Using Gaia DR2 we search for the pre-main sequence stars with unusually high proper motions that may be representative ... More
Modeling UV Radiation Feedback from Massive Stars: III. Escape of Radiation from Star-forming Giant Molecular CloudsAug 20 2019Using a suite of radiation hydrodynamic simulations of star cluster formation in turbulent clouds, we study the escape fraction of ionizing (Lyman continuum) and non-ionizing (FUV) radiation for a wide range of cloud masses and sizes. The escape fraction ... More
BAT AGN Spectroscopic Survey -- XIII. The nature of the most luminous obscured AGN in the low-redshift universeAug 20 2019We present a multi wavelength analysis of 28 of the most luminous low-redshift narrow-line, ultra-hard X-ray selected active galactic nuclei (AGN) drawn from the 70 month Swift/BAT all-sky survey, with bolometric luminosities of log(L_bol/erg/s) > 45.25. ... More
How to Find Variable Active Galactic Nuclei with Machine LearningAug 20 2019Machine-learning (ML) algorithms will play a crucial role in studying the large datasets delivered by new facilities over the next decade and beyond. Here, we investigate the capabilities and limits of such methods in finding galaxies with brightness-variable ... More
Metal Abundances and Star-Formation Rates of Emission-Line Galaxies in and around the Bootes VoidAug 20 2019We explore the possible dependencies of galaxy metal abundance and star-formation rate (SFR) on local environment, focusing on the volume of space in and around the Bootes Void. Our sample of star-forming galaxies comes from the second catalog of the ... More
The intrinsic reddening of the Magellanic Clouds as traced by background galaxies -- I. The bar and outskirts of the Small Magellanic CloudAug 20 2019We present a method to map the total intrinsic reddening of a foreground extinguishing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement this technique in two distinct regions of ... More
Origin Of Tidal Structures In Modified GravityAug 20 2019The missing mass problem has not been solved decisively yet. Observations show that if gravity is to be modified, then the MOND theory is its excellent approximation on galactic scales. MOND suggests an adjustments of the laws of physics in the limit ... More
Do three-body encounters in galactic nuclei affect compact binary merger rates?Aug 20 2019High-density cusps of compact remnants are expected to form around supermassive black holes (SMBHs) in galactic nuclei via dynamical friction and two-body relaxation. Due to the high density, binaries in orbit around the SMBH can frequently undergo close ... More
A physical model for [CII] line emission from galaxiesAug 20 2019A tight relation between the [CII]158$\mu$m line luminosity and star formation rate is measured in local galaxies. At high redshift ($z>5$), though, a much larger scatter is observed, with a considerable (15-20\%) fraction of the outliers being [CII]-deficient. ... More
Particle acceleration in a nearby galaxy cluster pair: the role of cluster dynamicsAug 20 2019Diffuse radio emission associated with the intra-cluster medium (ICM) is observed in a number of merging galaxy clusters. It is currently believed that in mergers a fraction of the kinetic energy is channeled into non-thermal components, such as turbulence, ... More
PICO: Probe of Inflation and Cosmic OriginsAug 20 2019The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting of an imaging polarimeter operating in frequency bands between 20 and 800 GHz. We describe the science achievable by PICO, which has sensitivity equivalent ... More
Optical follow-up of the tidal disruption event iPTF16fnl: new insights from X-shooter observationsAug 20 2019We present the results from Nordic Optical Telescope and X-shooter follow-up campaigns of the tidal disruption event (TDE) iPTF16fnl, covering the first $\sim$100 days after the transient discovery. We followed the source photometrically until the TDE ... More
Radio-loudness along the quasar main sequenceAug 20 2019Following the established view of the AGNs inner workings, an AGN is radio-loud (RL) if associated with relativistic ejections emitting a radio synchrotron spectrum (i.e., a jetted AGN). If large samples of optically-selected quasars are considered, AGNs ... More
The collision between the Milky Way and Andromeda and the fate of their Supermassive Black HolesAug 20 2019Our Galaxy and the nearby Andromeda Galaxy (M31) form a bound system, even though the relative velocity vector of M31 is currently not well constrained. Their orbital motion is highly dependent on the initial conditions, but all the reliable scenarios ... More
How first hydrostatic cores, tidal forces and gravo-turbulent fluctuations set the characteristic mass of starsAug 20 2019The stellar initial mass function (IMF) is playing a critical role in the history of our universe. We propose a theory that is based solely on local processes, namely the dust opacity limit, the tidal forces and the properties of the collapsing gas envelope. ... More
Non-thermal emission from cosmic rays accelerated in HII regionsAug 20 2019Aug 21 2019Radio observations at metre-centimetre wavelengths shed light on the nature of the emission of HII regions. Usually this category of objects is dominated by thermal radiation produced by ionised hydrogen, namely protons and electrons. However, a number ... More
Non-thermal emission from cosmic rays accelerated in HII regionsAug 20 2019Radio observations at metre-centimetre wavelengths shed light on the nature of the emission of HII regions. Usually this category of objects is dominated by thermal radiation produced by ionised hydrogen, namely protons and electrons. However, a number ... More
The Physical and chemical structure of Sagittarius B2 -- V. Non-thermal emission in the envelope of Sgr B2Aug 20 2019The giant molecular cloud Sagittarius B2 (hereafter SgrB2) is the most massive region with ongoing high-mass star formation in the Galaxy. In the southern region of the 40-pc large envelope of SgrB2, we encounter the SgrB2(DS) region which hosts more ... More
The physical and chemical structure of Sagittarius B2 -- V. Non-thermal emission in the envelope of Sgr B2Aug 20 2019Aug 22 2019The giant molecular cloud Sagittarius B2 (hereafter SgrB2) is the most massive region with ongoing high-mass star formation in the Galaxy. In the southern region of the 40-pc large envelope of SgrB2, we encounter the SgrB2(DS) region which hosts more ... More
When does the onset of multiple stellar populations in star clusters occur-II: No evidence of multiple stellar populations in Lindsay 113Aug 20 2019The presence of multiple populations (MPs) in almost all globular clusters (GCs) older than ~10 Gyr, has caught lots of attention. Recently, cumulative evidence indicates that extragalactic GCs that are older than 2 Gyr, seem to also harbor MPs, however, ... More
Modified Gravity Theories in Light of the Anomalous Velocity Dispersion of NGC1052-DF2Aug 20 2019Recent observations of ultra-dwarf galaxy NGC1052-DF2 started an interesting discussion between dark matter hypothesis and modified gravity theories. Reported low velocity dispersion (< 10.5 km/s at 90% confidence level) derived from the kinematic data ... More
The Origin of the X-ray Emission in Two Well-Aligned Extragalactic Jets: The Case for IC/CMBAug 20 2019Aug 22 2019Over the past two decades, the most commonly adopted explanation for high and hard X-ray emission in resolved quasar jets has been inverse Compton upscattering of the Cosmic Microwave Background (IC/CMB), which requires jets which remain highly relativistic ... More
The Origin of the X-ray Emission in Two Well-Aligned Extragalactic Jets: The Case for IC/CMBAug 20 2019Over the past two decades, the most commonly adopted explanation for high and hard X-ray emission in resolved quasar jets has been inverse Compton upscattering of the Cosmic Microwave Background (IC/CMB), which requires jets which remain highly relativistic ... More
Substructures in Minor Mergers' Tidal StreamsAug 20 2019In this work, we explore the idea that substructures like stellar clusters could be formed from the tidal stream produced in galactic minor mergers. We use $N$-body and SPH simulations of satellite galaxies interacting with a larger galaxy. We study the ... More
The Third Data Release of the Beijing-Arizona Sky SurveyAug 19 2019The Beijing-Arizona Sky Survey (BASS) is a wide and deep imaging survey to cover a 5400 deg$^2$ area in the Northern Galactic Cap with the 2.3m Bok telescope using two filters ($g$ and $r$ bands). The Mosaic $z$-band Legacy Survey (MzLS) covers the same ... More
A Gaia-Enceladus analogue in the EAGLE simulation: insights into the early evolution of the Milky WayAug 19 2019We identify a simulated Milky Way-analogue in the \eagle{} suite of cosmological hydrodynamical simulations. This galaxy not only shares similar global properties as the Milky Way, but was specifically selected because its merger history resembles that ... More
A Tale of Two Clusters: An Analysis of Gas-Phase Metallicity and Nebular Gas Conditions in Proto-cluster Galaxies at z~2Aug 19 2019The ZFIRE survey has spectroscopically confirmed two proto-clusters using the MOSFIRE instrument on Keck 1: one at z=2.095 in COSMOS and another at z=1.62 in UDS. Here we use an updated ZFIRE dataset to derive the properties of ionized gas regions of ... More
Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomyAug 19 2019The Argentine Institute of Radio astronomy (IAR) is equipped with two single-dish 30mts radio antennas capable of performing daily observations of pulsars and radio transients in the southern hemisphere at 1.4 GHz. We aim to introduce to the international ... More
Machine Learning Classifiers for Intermediate Redshift Emission Line GalaxiesAug 19 2019Classification of intermediate redshift ($z$ = 0.3--0.8) emission line galaxies as star-forming galaxies, composite galaxies, active galactic nuclei (AGN), or low-ionization nuclear emission regions (LINERs) using optical spectra alone was impossible ... More
First sub-arcsecond submillimeter-wave [C I] image of 49 Ceti with ALMAAug 19 2019We present the first sub-arcsecond images of 49 Ceti in the [C I]3P1-3P0 emission and the 614 micron dust continuum emission observed with ALMA, as well as that in the CO(J=3-2) emission prepared by using the ALMA archival data. The spatial distribution ... More
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 $\le$ z $\le$ 7.0Aug 19 2019We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 $\le$ z $\le$ 7.0. This is the tenth in a series of papers from the Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) project, which exploits the deep multi-band imaging ... More
The Astrochemical Impact of Cosmic Rays in Protoclusters II: CI-to-H$_2$ and CO-to-H$_2$ Conversion FactorsAug 19 2019We utilize a modified astrochemistry code which includes cosmic ray attenuation in-situ to quantify the impact of different cosmic-ray models on the CO-to-H$_2$ and CI-to-H$_2$ conversion factors, $X_{\rm CO}$ and $X_{\rm CI}$, respectively. We consider ... More
Warm dark matter chills out: constraints on the halo mass function and the free-streaming length of dark matter with 8 quadruple-image strong gravitational lensesAug 19 2019The free-streaming length of dark matter depends on fundamental dark matter physics, and determines the abundance and central densities of dark matter halos on sub-galactic scales. Using the image positions and flux-ratios from eight quadruply-imaged ... More
Spectroscopic studies of stellar populations in globular clusters and field stars: implications for globular cluster and Milky Way halo formationAug 19 2019We review spectroscopic results concerning multiple stellar populations in globularclusters. The cluster initial mass is the most important parameter determining the fraction of second generation stars. The threshold for the onset of the multiple population ... More
Revealing Hidden Substructures in the $M_{BH}$-$σ$ Diagram, and Refining the Bend in the $L$-$σ$ RelationAug 19 2019Using 143 early- and late-type galaxies (ETGs and LTGs) with directly-measured super-massive black hole masses ($M_{BH}$), we build upon our previous discoveries that: (i) LTGs, most of which have been alleged to contain a pseudobulge, follow the relation ... More
The role of a top-heavy integrated galactic IMF on the chemical evolution of high-redshift starburstsAug 19 2019We apply a top-heavy integrated galactic initial mass function (IGIMF) to the chemical evolution of spheroids and compare our results with high redshift starburst galaxies. These objects are, in fact, very likely to be elliptical galaxies suffering their ... More
Smaller stellar disc scale lengths in rich environmentsAug 19 2019We investigate the dependence of stellar disc scale lengths on environment for a sample of Sloan Digital Sky Survey Data Release 7 galaxies with published photometric bulge-disc decompositions. We compare disc scale lengths at fixed bulge mass for galaxies ... More
UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?Aug 19 2019The so-called ultraviolet (UV) upturn of elliptical galaxies is a phenomenon characterised by the up-rise of their fluxes in bluer wavelengths, typically in the 1,200-2,500A range. This work aims at estimating the rate of occurrence of the UV upturn over ... More
Scalar field effects on the orbit of S2 starAug 19 2019Precise measurements of the S-stars orbiting SgrA* have set strong constraints on the nature of the compact object at the centre of the Milky Way. The presence of a black hole in that region is well established, but its neighboring environment is still ... More
Multiple Stellar Populations of Globular Clusters from Homogeneous Ca--CN--CH Photometry. V. $cn^\prime_{\rm JWL}$ as a Surrogate $cn_{\rm JWL}$ Index and NGC 6723Aug 19 2019We introduce new color indices $cn^\prime_{\rm JWL}$ (= $Ca_{\rm CTIO} - Ca_{\rm JWL}$) and $ch_{\rm JWL}$ [=$(JWL43 - b) - (b-y)$], accurate photometric measures of the CN band at $\lambda$3883 and the CH G band, respectively, in the study of the multiple ... More
The beamed jet and quasar core of the distant blazar 4C 71.07Aug 19 2019The object 4C 71.07 is a high-redshift blazar whose spectral energy distribution shows a prominent big blue bump and a strong Compton dominance. We present the results of a two-year multiwavelength campaign led by the Whole Earth Blazar Telescope (WEBT) ... More
The Nuclear Source of the Galactic Wind in NGC 253Aug 18 2019We present Br$\gamma$ emission line kinematics of the nuclear region of NGC 253, recently known to host a strong galactic wind that limits the global star formation of the galaxy. We obtained high-resolution long-slit spectroscopic data with PHOENIX at ... More
Stellar rotation bifurcation caused by tidal locking in the open cluster NGC 2287?Aug 18 2019We present a detailed analysis of the projected stellar rotational velocities of the well-separated double main sequence (MS) in the young, $\sim200$Myr-old Milky Way open cluster NGC 2287 and suggest that stellar rotation may drive the split MSs in NGC ... More
Tidal-locking-induced stellar rotation dichotomy in the open cluster NGC 2287?Aug 18 2019Stars spend most of their lifetimes on the `main sequence' (MS) in the Hertzsprung--Russell diagram. The obvious double MSs seen in the equivalent color--magnitude diagrams characteristic of Milky Way open clusters pose a fundamental challenge to our ... More
Slowly rotating Bose-Einstein Condensate confronted with the rotation curves of 12 dwarf galaxiesAug 18 2019We assemble a database of 12 dwarf galaxies, for which optical (R-band) and near-infrared ($3.6\mu m$) surface brightness density together with spectroscopic rotation curve data are available, in order to test the slowly rotating Bose-Einstein Condensate ... More
Radio continuum emission from local analogs of high-z faint LAEs: Blueberry galaxiesAug 18 2019We present a radio continuum study of a population of extremely young and starburst galaxies, termed as blueberries at ${\sim}$ 1 GHz using the upgraded Giant Metrewave Radio Telescope (uGMRT). We find that their radio-based star formation rate (SFR) ... More
Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters. II. The Case of Terzan 5Aug 18 2019Using archival {\it Chandra} observations with a total effective exposure of 734 ks, we derive an updated catalog of point sources in the massive globular cluster Terzan 5. Our catalog covers an area of $58.1\, \rm arcmin^{2}$ ($R\leq 4.3 \, \rm arcmin$) ... More
Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 GrismAug 17 2019The magnifications of compact-source lenses are extremely sensitive to the presence of low mass dark matter halos along the entire sight line from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational ... More
The Wolf-Rayet Content of the Galaxies of the Local Group and BeyondAug 17 2019Wolf-Rayet stars (WRs) represent the end of a massive star's life as it is about to turn into a supernova. Obtaining complete samples of such stars across a large range of metallicities poses observational challenges, but presents us with an exacting ... More
How Drag Force Evolves in Global Common Envelope SimulationsAug 16 2019We compute the forces, torque and rate of work on the companion-core binary due to drag in global simulations of common envelope (CE) evolution for three different companion masses. Our simulations help to delineate regimes when conventional analytic ... More
On the optimal calibration of VVV photometryAug 16 2019Prompted by some inconsistencies in the photometry of the VISTA Variables in the V\'ia L\'actea (VVV) survey, we conduct a revision of the standard calibration procedure of VISTA data in the $J$, $H$, and $K_S$ passbands. Two independent sources of bias ... More
The Carnegie-Chicago Hubble Program. VII. The Distance to M101 via the Optical Tip of the Red Giant Branch MethodAug 16 2019The Carnegie-Chicago Hubble Program (CCHP) is building a direct path to the Hubble constant (H0) using Population II stars as the calibrator of the SN Ia-based distance scale. This path to calibrate the SN Ia is independent of the systematics in the traditional ... More
Abundance ratios in GALAH DR2 and their implications for nucleosynthesisAug 16 2019Using a sample of 70 924 stars from the second data release of the GALAH optical spectroscopic survey, we construct median sequences of [X/Mg] vs. [Mg/H] for 21 elements, separating the low-Ia (high-$\alpha$) and high-Ia (low-$\alpha$) stellar populations ... More
The Intrinsic Scatter of the Radial Acceleration RelationAug 16 2019We present a detailed Monte Carlo model of observational errors in observed galaxy scaling relations to recover the intrinsic (cosmic) scatter driven by galaxy formation and evolution processes. We apply our method to the stellar radial acceleration relation ... More
The impact of stars stripped in binaries on the integrated spectra of stellar populationsAug 16 2019Stars stripped of their envelopes from interaction with a binary companion emit a significant fraction of their radiation as ionizing photons. They are potentially important stellar sources of ionizing radiation, however, they are still often neglected ... More
A young and obscured AGN embedded in the giant radio galaxy Mrk 1498Aug 16 2019Mrk 1498 is part of a sample of galaxies with extended emission line regions (extended outwards up to a distance of $\sim$7 kpc) suggested to be photo-ionized by an AGN that has faded away or that is still active but heavily absorbed. Interestingly, the ... More
Gaia Parallax of Milky Way Globular Clusters -- A Solution of Mixture ModelAug 16 2019We have established a mixture model approach to derive the parallax of the Milky Way globular clusters. It avoids the problem of cluster membership determination and provides a completely independent astrometrical solution by purely using the parallax ... More
Habitability of galaxies and application of merger trees in astrobiologyAug 16 2019Galaxies represent the main form of organization of matter in our universe. Therefore, they are of obvious interest for the new multidisciplinary field of astrobiology. In particular, to study habitability of galaxies represents one of the main emerging ... More
Electron Impact Excitation of S III: an AssessmentAug 16 2019In a recent paper, Tayal et al. [{\em Astrophys. J. Suppl.} {\bf 2019}, {\emph 242}, 9] have reported results for energy levels, radiative rates (A-values) and effective collision strengths ($\Upsilon$) for transitions among the 198 levels of Si-like ... More
The aromatic UniverseAug 16 2019The rich molecular structures of polycyclic aromatic hydrocarbons -- essentially planar flakes of fused benzene rings -- and their fullerene cousins are revealed through their vibrational and electronic spectra.
EZOA -- A catalogue of EBHIS HI detected galaxies in the northern Zone of AvoidanceAug 16 2019We present a catalogue of galaxies in the northern Zone of Avoidance (ZoA), extracted from the shallow version of the blind HI survey with the Effelsberg 100 m radio telescope, EBHIS, that has a sensitivity of 23 mJy/beam at 10.24 km/s velocity resolution. ... More
Probing Massive Black Hole Binary Populations with LISAAug 15 2019ESA and NASA are moving forward with plans to launch LISA around 2034. With data from the Illustris cosmological simulation, we provide analysis of LISA detection rates accompanied by characterization of the merging massive black hole population. Massive ... More
The impact of the observed baryon distribution in haloes on the total matter power spectrumAug 15 2019The interpretation of upcoming weak gravitational lensing surveys depends critically on our understanding of the matter power spectrum on scales $k < 10 h/\mathrm{Mpc}$, where baryonic processes are important. In this paper we study the impact of gas ... More
The Formation of Ultra-Diffuse Galaxies from Passive Evolution in the RomulusC Galaxy Cluster SimulationAug 15 2019We study the origins of 122 ultra-diffuse galaxies (UDGs) in the RomulusC zoom-in cosmological simulation of a galaxy cluster (M$_{200} = 1.15 \times 10^{14}$ M$_{\odot}$), one of the only such simulations capable of resolving the evolution and structure ... More
The Hubble Legacy Field GOODS-S Photometric CatalogAug 15 2019This manuscript describes the public release of the Hubble Legacy Fields (HLF) project photometric catalog for the extended GOODS-South region from the Hubble Space Telescope (HST) archival program AR-13252. The analysis is based on the version 2.0 HLF ... More
IRC+10216 mass loss properties through the study of $λ$3mm emission: Large spatial scale distribution of SiO, SiS, and CSAug 15 2019The study of the gas in the envelopes surrounding asymptotic giant branch (AGB) stars through observations in the millimetre wavelength range provides information about the history and nature of these molecular factories. Here we present ALMA observations ... More
[OII] emitters in MultiDark-Galaxies and DEEP2Aug 15 2019We use three semi-analytic models (SAMs) of galaxy formation and evolution run on the same $1 h^{-1}$Gpc MultiDark Planck 2 cosmological simulation to investigate the properties of [OII] emission line galaxies over the redshift range $0.6<z<1.2$. We compare ... More
An Improved Distance to NGC 4258 and its Implications for the Hubble ConstantAug 15 2019NGC 4258 is a critical galaxy for establishing the extragalactic distance scale and estimating the Hubble constant (Ho). Water masers in the nucleus of the galaxy orbit about its supermassive black hole, and VLBI observations of their positions, velocities ... More
The Distribution of Dense Cores near HII RegionsAug 15 2019An investigation of dust emission associated with a large sample of HII regions has been carried out. Stacked results from this sample suggest that each HII region is at or near the center of a cluster of dense cores, that extends far beyond the HII region, ... More
Using failed supernovae to constrain the Galactic r-process element productionAug 15 2019Rapid neutron capture process (r-process) elements have been detected in a large fraction of metal-poor halo stars, with abundances relative to iron (Fe) that vary by over two orders of magnitude. This scatter is reduced to less than a factor of 3 in ... More
Theoretical ISM pressure and electron density diagnostics for local and high-redshift galaxiesAug 15 2019Aug 16 2019We derive new self-consistent theoretical UV, optical, and IR diagnostics for the ISM pressure and electron density in the ionized nebulae of star-forming galaxies. Our UV diagnostics utilize the inter-combination, forbidden and resonance lines of silicon, ... More
Theoretical ISM pressure and electron density diagnostics for local and high-redshift galaxiesAug 15 2019We derive new self-consistent theoretical UV, optical, and IR diagnostics for the ISM pressure and electron density in the ionized nebulae of star-forming galaxies. Our UV diagnostics utilize the inter-combination, forbidden and resonance lines of silicon, ... More