Latest in astro-ph

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The variation of the magnetic field of the Ap star HD~50169 over its 29 year rotation periodFeb 15 2019Context. The Ap stars that rotate extremely slowly, with periods of decades to centuries, represent one of the keys to the understanding of the processes leading to the differentiation of stellar rotation. Aims. We characterise the variations of the magnetic ... More
Photoionization Emission Models for the Cyg X-3 X-ray SpectrumFeb 14 2019We present model fits to the X-ray line spectrum of the well known High Mass X-ray binary Cyg X-3. The primary observational dataset is a spectrum taken with the $Chandra$ X-ray Observatory High Energy Transmission Grating (HETG) in 2006, though we compare ... More
Accretion disk versus jet orientation in H$_{2}$O megamaser galaxiesFeb 14 2019An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc sized accretion disks. Because of the small linear and angular scales involved, this alignment has ... More
Orientation effects on the near-infrared broad band emission of quasarsFeb 14 2019We recently proposed the equivalent width (EW) of the narrow [OIII]5007{\AA} emission line as an orientation indicator for active galactic nuclei. We tested this method on about $12,300$ optically selected broad line quasars from the SDSS 7th Data Release ... More
On structure formation from a small-scales-interacting dark sectorFeb 14 2019We consider a cosmological model with an interaction between dark matter and dark energy which leaves the background cosmology unaffected and only affects the evolution of the perturbations. This is achieved by introducing a coupling given in terms of ... More
A Code to Make Your Own Synthetic ObservaTIonS (MYOSOTIS)Feb 14 2019We introduce our new code MYOSOTIS (Make Your Own Synthetic ObservaTIonS) which is designed to produce synthetic observations from simulated clusters. The code can synthesise observations from both ground- and spaced-based observatories, for a range of ... More
Searching for Highly Magnified Stars at Cosmological Distances: Discovery of a Redshift 0.94 Blue Supergiant in Archival Images of the Galaxy Cluster MACS J0416.1-2403Feb 14 2019Individual highly magnified stars have been recently discovered at lookback times of more than half the age of the Universe, in lensed galaxies that straddle the critical curves of massive galaxy clusters. Having confirmed their detectability, it is now ... More
Neutrino Physics with the PTOLEMY projectFeb 14 2019The PTOLEMY project aims to develop a scalable design for a Cosmic Neutrino Background (CNB) detector, the first of its kind and the only one conceived that can look directly at the image of the Universe encoded in neutrino background produced in the ... More
Bayesian modeling of the nuclear equation of state for neutron star tidal deformabilities and GW170817Feb 14 2019We present predictions for neutron star tidal deformabilities obtained from a Bayesian analysis of the nuclear equation of state. The Bayesian posterior probability distribution is constructed from priors obtained from microscopic many-body theory based ... More
A semi-analytical perspective on massive galaxies at $z\sim0.55$Feb 14 2019The most massive and luminous galaxies in the Universe serve as powerful probes to study the formation of structure, the assembly of mass, and cosmology. However, their detailed formation and evolution is still barely understood. Here we extract a sample ... More
A comprehensive statistical study on gamma-ray burstsFeb 14 2019In order to obtain an overview of the gamma-ray bursts (GRBs), we need a full sample. In this paper, we collected 6289 GRBs (from GRB 910421 to GRB 160509A) from the literature, including prompt emission, afterglow and host galaxy properties. We hope ... More
Cosmological evolution of quasar radio emission in the view of multifractalityFeb 14 2019Variations in scaling behavior in the flux and emissions of distant astronomical sources with respect to their cosmic time are important l phenomena that can provide valuable information about the dynamics within the sources and their cosmological evolution ... More
Near-infrared spectroscopy of the massive stellar population of W51: evidence for multi-seeded star formationFeb 14 2019The interplay between the formation of stars, stellar feedback and cloud properties strongly influences the star formation history of giant molecular clouds. The formation of massive stars leads to a variety of stellar clusters, ranging from low stellar ... More
Kernel formalism applied to Fourier based Wave Front Sensing in presence of residual phasesFeb 14 2019In this paper, we show how it is possible to understand Fourier-based Wave Front Sensors (WFS) as Linear Integral Operators. Indeed optical laws allow to identify quantities called "Kernels" which are the continuous version of well-known interaction matrices ... More
Pebble accretion in self-gravitating protostellar discsFeb 14 2019Pebble accretion has become a popular component to core accretion models of planet formation, and is especially relevant to the formation of compact, resonant terrestrial planetary systems. Pebbles initially form in the inner protoplanetary disc, sweeping ... More
Transparent tiles of silica aerogels for high-energy physicsFeb 14 2019Silica aerogels are important to be used as photon radiators in Cherenkov counters for high-energy-physics experiments because of their optical transparency and intermediate refractive indices between those of gases and liquids or solids. Cherenkov counters ... More
A Proposed Method for a Photon-Counting Laser Coherence Detection System to Complement Optical SETIFeb 14 2019The detection of laser radiation originating from space is a positive indicator of Extra Terrestrial Intelligence (ETI). Thus far the optical search for ETI (OSETI) has looked for enhanced brightness in the form of either narrow-band spectral emission ... More
Galaxy Evolution in ClustersFeb 14 2019In this thesis, we aim to further elucidate the phenomenon of galaxy evolution in the environment of galaxy clusters using the methodology of numerical simulations. For that, we have developed hydrodynamic models in which idealized gas-rich galaxies move ... More
Carbon star wind models at solar and sub-solar metallicities: a comparative study. I. Mass loss and the properties of dust-driven windsFeb 14 2019The atmospheres and winds of C-type AGB stars are modeled with the 1D spherically symmetric radiation-hydrodynamical code DARWIN. To explore the metallicity-dependence of mass loss we calculate model grids at three different chemical abundances. Since ... More
A VLT/FLAMES survey for massive binaries in Westerlund 1: VI. Properties of X-ray bright massive cluster membersFeb 14 2019Despite the first detection of X-rays from massive stars occurring four decades ago, the physical dependence of the emission mechanism(s) on the underlying stellar and binary properties of the emitters remains uncertain. The young massive cluster Westerlund ... More
The central 1000 AU of a pre-stellar core revealed with ALMA. I. 1.3 mm continuum observationsFeb 14 2019Stars like our Sun form in self-gravitating dense and cold structures within interstellar clouds, called pre-stellar cores. Although much is known about the physical structure of dense clouds just before and soon after the switch-on of a protostar, the ... More
Solar cycle activity: an early prediction for cycle #25Feb 14 2019Solar activity forecasting is an important topic for numerous scientific and technological areas, such as space mission operations, electric power transmission lines, power transformation stations and earth geophysical and climatic impact. Nevertheless, ... More
Cosmic Inflation: Trick or Treat?Feb 14 2019Discovered almost forty years ago, inflation has become the leading paradigm for the early universe. Originally invented to avoid the fine-tuning puzzles of the standard model of cosmology, the so-called hot Big Bang phase, inflation has always been the ... More
A morphological study of galaxies in ZwCl0024+1652, a galaxy cluster at redshift z $\sim$ 0.4Feb 14 2019The well-known cluster of galaxies ZwCl0024+1652 at z $\sim$ 0.4, lacks an in-depth morphological classification of its central region. While previous studies provide a visual classification of a patched area, we used the public code called galaxy Support ... More
The tilt of the velocity ellipsoid in the Milky Way with Gaia DR2Feb 14 2019The velocity distribution of stars is a sensitive probe of the gravitational potential of the Galaxy, and hence of its dark matter distribution. In particular, the shape of the dark halo (e.g. spherical, oblate, prolate) determines velocity correlations, ... More
Experimental nuclear astrophysics in ItalyFeb 14 2019Feb 15 2019Nuclear astrophysics, the union of nuclear physics and astronomy, went through an impressive expansion during the last twenty years. This could be achieved thanks to milestone improvements in astronomical observations, cross section measurements, powerful ... More
Experimental nuclear astrophysics in ItalyFeb 14 2019Nuclear astrophysics, the union of nuclear physics and astronomy, went through an impressive expansion during the last twenty years. This could be achieved thanks to milestone improvements in astronomical observations, cross section measurements, powerful ... More
Uncovering the progenitor of the Cetus stream with StarGO -- a low mass dwarf with a nuclear star clusterFeb 14 2019We use a novel cluster identification tool StarGO to explore the metal poor ([Fe/H] $<$ -1.5) outer stellar halo (d $>$ 15 kpc) of the Milky Way using data from Gaia, LAMOST and SDSS. Our method is built using an unsupervised learning algorithm, a self-organizing ... More
Plasma flows in the cool loop systemsFeb 14 2019We study the dynamics of low-lying cool loop systems for three datasets as observed by the Interface Region Imaging Spectrograph (IRIS). Radiances, Doppler shifts and line widths are investigated in and around observed cool loop systems using various ... More
Aggregate Hazes in Exoplanet AtmospheresFeb 14 2019Photochemical hazes have been frequently used to interpret exoplanet transmission spectra that show an upward slope towards shorter wavelengths and weak molecular features. While previous studies have only considered spherical haze particles, photochemical ... More
No-go theorem for static boson starsFeb 14 2019It is proved that self-gravitating static scalar fields whose self-interaction potential $V(\psi^2)$ is a monotonically increasing function of its argument cannot form spherically symmetric asymptotically flat bound matter configurations. Our compact ... More
An enigmatic hump around 30 keV in Suzaku spectra of Aquila X-1 in the Hard StateFeb 14 2019The typical accreting neutron star, Aquila X-1, was observed with Suzaku seven times in the decay phase of an outburst in 2007 September-October. Among them, the second to the fourth observations were performed 10 to 22 days after the outburst peak, when ... More
Investigation of the asteroid-neutron star collision model for the repeating fast radio burstsFeb 14 2019The origin of fast radio bursts (FRBs) is still a mystery. One model proposed to interpret the only known repeating object, FRB 121102, is that the radio emission is generated from asteroids colliding with a highly magnetized neutron star (NS). With N-body ... More
A Comparison of Photometric Redshift Techniques for Large Radio SurveysFeb 14 2019Future radio surveys will generate catalogues of tens of millions of radio sources, for which redshift estimates will be essential to achieve many of the science goals. However, spectroscopic data will be available for only a small fraction of these sources, ... More
Non-thermal emission from the interaction of magnetized exoplanets with the wind of their host starFeb 13 2019We study the non-thermal emission from the interaction between magnetized Jupiter-like exoplanets and the wind from their host star. The supersonic motion of planets through the wind forms a bow shock that accelerates electrons which produces non-thermal ... More
GROJ1750-27: a neutron star far behind the Galactic Center switching into the propeller regimeFeb 13 2019We report on analysis of properties of the X-ray binary pulsar GROJ1750-27 based on X-ray (Chandra, Swift, and Fermi/GBM), and near-infrared (VVV and UKIDSS surveys) observations. An accurate position of the source is determined for the first time and ... More
The Origin of Kepler-419b: A Path to Tidal Migration Via Four-body Secular InteractionsFeb 13 2019We test the high-eccentricity tidal migration scenario for Kepler-419b, a member of the eccentric warm Jupiter class of planets whose origin is debated. Kepler-419 hosts two known planets (b,c). However, in its current configuration, planet c cannot excite ... More
Dust unveils the formation of a mini-Neptune planet in a protoplanetary ringFeb 13 2019Rings and radial gaps are ubiquitous in protoplanetary disks. Their possible connection to planet formation is currently subject to intense debate. In principle, giant planet formation leads to wide gaps which separate the gas and dust mass reservoir ... More
Strong Lensing considerations for the LSST observing strategyFeb 13 2019Strong gravitational lensing enables a wide range of science: probing cosmography; testing dark matter models; understanding galaxy evolution; and magnifying the faint, small and distant Universe. However to date exploiting strong lensing as a tool for ... More
Discovery of Strongly-lensed Gravitational Waves - Implications for the LSST Observing StrategyFeb 13 2019LSST's wide-field of view and sensitivity will revolutionize studies of the transient sky by finding extraordinary numbers of new transients every night. The recent discovery of a kilonova counterpart to LIGO/Virgo's first detection of gravitational waves ... More
The source number counts at high energies: SWIFT vs. NuSTARFeb 13 2019The hard X-ray sky at energies above 10 keV, has been extensively explored by the Swift and the NuSTAR missions in the 14-195 keV and the 3-24 keV bands respectively. The major population of the hard X-ray detected sources are AGN. We compare the number ... More
Herschel water maps towards the vicinity of the black hole Sgr A*Feb 13 2019Aims: We study the spatial distribution and kinematics of water emission in a ~64 pc$^2$ region of the Galactic Center (GC) around Sgr A*. We also analyze the water excitation to derive the physical conditions and water abundances in the CND and the `quiescent ... More
Hunting for the Dark Matter Wake Induced by the Large Magellanic CloudFeb 13 2019Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. The recent infall of the Milky Way's (MW) most massive satellite galaxy, ... More
$R_h=ct$ and the eternal coasting cosmological modelFeb 13 2019We point out that the nonempty $R_h=ct$ cosmological model has some known antecedents in the literature. Some of those eternal coasting models are published even before the discovery of the accelerated expansion of the universe and were shown to have ... More
Using Commensurabilities and Orbit Structure to Understand Barred Galaxy EvolutionFeb 13 2019We interpret simulations of secularly-evolving disc galaxies through orbit morphology. Using a new geometric algorithm that rapidly isolates commensurate (resonant) orbits, we identify phase-space regions occupied by different orbital families. Compared ... More
Constraining the neutron star equation of state using multi-band independent measurements of radii and tidal deformabilitiesFeb 13 2019Using a Bayesian approach, we combine measurements of neutron star macroscopic observables obtained by astrophysical and gravitational observations, to derive joint constraints on the equation of state (EoS) of matter at supranuclear density. In our analysis ... More
Modelling the observed luminosity function and clustering evolution of Lyman-$α$ emitters: growing evidence for late reionizationFeb 13 2019We model the high redshift (z > 5) Lyman-$\alpha$ emitting (LAE) galaxy population using the empirical rest-frame equivalent width distribution. We calibrate to the observed luminosity function and angular correlation function at z = 5.7 as measured by ... More
Revisiting the Dark Photon Explanation of the Muon g-2 AnomalyFeb 13 2019A massive $U(1)^{\prime}$ gauge boson, "dark photon" or $A^{\prime}$, has long been proposed as a potential explanation of the muon $g-2$ anomaly ($g_{\mu} - 2$). However, recent experimental results have excluded this possibility for a dark photon exhibiting ... More
X-Ray Spectral Variability of Ultraluminous X-Ray Sources in Extragalactic Globular ClustersFeb 13 2019A number of ultraluminous X-ray sources (ULXs) are physically associated with extragalactic globular clusters (GCs). We undertake a systematic X-ray analysis of eight of the brightest of these sources. We fit the spectra of the GC ULXs to single power ... More
A class of partly burnt runaway stellar remnants from peculiar thermonuclear supernovaeFeb 13 2019We report the discovery of three stars that, along with the prototype LP 40-365, form a distinct class of chemically peculiar runaway stars that are the survivors of thermonuclear explosions. Spectroscopy of the four confirmed LP 40-365 stars finds ONe-dominated ... More
The Evolution of Magnetic Rayleigh-Taylor Unstable Plumes and Hybrid KH-RT Instability into A Loop-like Eruptive ProminenceFeb 13 2019MRT unstable plumes are observed in a loop-like eruptive prominence using SDO/AIA observations. The small-scale cavities are developed within the prominence, where perturbations trigger dark plumes (P1 \& P2) propagating with the speed of 35-46 km s$^{-1} ... More
CHIANTI - an atomic database for emission lines - Paper XV: Version 9, improvements for the X-ray satellite linesFeb 13 2019CHIANTI contains a large quantity of atomic data for the analysis of astrophysical spectra. Programs are available in IDL and Python to perform calculation of the expected emergent spectrum from these sources. The database includes atomic energy levels, ... More
Gamma rays from red giant wind bubbles entering the jets of elliptical host blazarsFeb 13 2019Blazars in elliptical hosts have a population of red giants surrounding their jet. These stars can carry large wind-blown bubbles into the jets, leading to gamma-ray emission through bubble-jet interactions. We study the interaction dynamics and the gamma-ray ... More
Relationship between the Line Width of the Atomic and Molecular ISM in M33Feb 13 2019We investigate how the spectral properties of atomic (HI) and molecular (H$_2$) gas, traced by CO(2-1), are related in M33 on $80$ pc scales. We find the HI and CO(2-1) velocity at peak intensity to be highly correlated, consistent with previous studies. ... More
Thermodynamics of Element Volatility and its Application to Planetary ProcessesFeb 13 2019Despite its importance in geological sciences, our understanding of interactions between gas and condensed phases (comprising solids and liquids) remains clouded by the fact that, often, only indirect evidence remains for their occurrence. This arises ... More
Squeezed tensor non-Gaussianity in non-attractor inflationFeb 13 2019We investigate primordial tensor non-Gaussianity in single field inflation, during a phase of non-attractor evolution when the spectrum of primordial tensor modes can be enhanced to a level detectable at interferometer scales. Making use of a tensor duality ... More
Effective field theory for gravitational radiation in scalar-tensor gravityFeb 13 2019A light scalar degree of freedom, as the one possibly responsible for the accelerated expansion of the Universe, could leave observable traces in the inspiral gravitational wave signal of binary systems. In order to study these effects, we extend the ... More
A reduced chemical scheme for modelling warm to hot hydrogen-dominated atmospheresFeb 13 2019Three dimensional models that account for chemistry are useful tools to predict the chemical composition of (exo)planet and brown dwarf atmospheres and interpret observations of future telescopes. Recent Juno observations of the NH3 tropospheric distribution ... More
Accelerating parameter inference with graphics processing unitsFeb 13 2019Gravitational wave Bayesian parameter inference involves repeated comparisons of GW data to generic candidate predictions. Even with algorithmically efficient methods like RIFT or reduced-order quadrature, the time needed to perform these calculations ... More
Limit on the population of repeating fast radio bursts from the ASKAP/CRAFT lat50 surveyFeb 13 2019A method is presented to limit the volumetric density of repeating fast radio bursts based on the number (or lack) of repeating bursts identified in a survey. The method incorporates the instantaneous sensitivity of the instrument, its beam pattern, and ... More
Two-mediator dark matter models and cosmic electron excessFeb 13 2019The cosmic electron energy spectrum recently observed by the DAMPE experiment exhibits two interesting features, including a break around 0.9 TeV and a sharp resonance near 1.4 TeV. In this analysis, we propose a dark matter explanation to both exotic ... More
Spectral analysis of the barium central star of the planetary nebula Hen 2-39Feb 13 2019Barium stars are peculiar red giants characterized by an overabundance of s-process elements along with an enrichment in carbon. These stars are discovered in binaries with white dwarf companions. The more recently formed of these stars are still surrounded ... More
Estimating the Integrated Bispectrum from Weak Lensing MapsFeb 13 2019We use a recently introduced statistic called Integrated Bispectrum (IB) to probe the gravity-induced non-Gaussianity at the level of the bispectrum from weak lensing convergence or $\kappa$ maps. We generalize the concept of the IB to spherical coordinates, ... More
What determines the shape of the local (z<0.1) infrared galaxy luminosity function?Feb 13 2019We investigate what shapes the infrared luminosity function of local galaxies by comparing it to the local infrared AGN luminosity function. The former corresponds to emission from dust heated by stars and AGN, whereas the latter includes emission from ... More
The Role of a Tiny Brightening in a Huge Geo-effective Solar Eruption Leading to the St Patrick's Day StormFeb 13 2019The largest magnetic storm in solar cycle 24 was caused by a fast coronal mass ejection (CME) that was related to a small C9.1 flare that occurred on 15 March 2015 in solar active region (AR) NOAA 12297. The purpose of this study is to understand the ... More
HADES RV Programme with HARPS-N at TNG. X. The non-saturated regime of the stellar activity-rotation relationship for M-DwarfsFeb 13 2019Aims. We aim to extend the relationship between X-ray luminosity (Lx) and rotation period (Prot) found for main-sequence FGK stars and test whether it also holds for early-M dwarfs, especially in the non-saturated regime (Lx {\alpha} P_{rot}^{-2}) which ... More
Layered semi-convection and tides in giant planet interiors - II. Tidal dissipationFeb 13 2019Recent Juno observations have suggested that the heavy elements in Jupiter could be diluted throughout a large fraction of its gaseous envelope, providing a stabilising compositional gradient over an extended region of the planet. This could trigger layered ... More
Results from the SuperModel Analysis of the X-COP Galaxy Clusters SampleFeb 13 2019In this work, the analysis of the stacked projected temperature profile of twelve galaxy clusters of the X-COP sample is performed via the SuperModel, a tool for investigating the intracluster medium thermodynamic properties already tested on many clusters ... More
Delayed Outburst of H 1743--322 in 2003 and relation with its other outburstsFeb 13 2019The Galactic transient black hole candidate H 1743--322 exhibited a long duration outburst in 2003 after more than two and a half decades of inactivity. The 2003 event was extensively studied in multi-wavelength bands by many groups. The striking feature ... More
Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM CepheiFeb 13 2019UX Orionis stars (UXors) are Herbig Ae/Be or T Tauri stars exhibiting sporadic occultation of stellar light by circumstellar dust. GM\,Cephei is such a UXor in the young ($\sim4$~Myr) open cluster Trumpler\,37, showing prominent infrared excess, emission-line ... More
Self-similar expansion model of cylindrical flux ropes combined with Alfven wave current systemFeb 13 2019Magnetic flux ropes in space are generally connected to some regions electromagnetically. We consider the whole closed current system of the expanding flux ropes including the electric current associated with them. By combining the theories regarding ... More
Detailed study of detection method for ultra-low-frequency gravitational waves with pulsar spin-down rate statisticsFeb 13 2019A new detection method for gravitational waves (GWs) with ultra-low frequencies ($f_{\rm GW} \lesssim 10^{-10}~{\rm Hz}$), which is much lower than the range of pulsar timing arrays (PTAs), was proposed in Yonemaru et al. (2016). This method utilizes ... More
Cavities, shocks and a cold front around 3C 320Feb 13 2019We present results obtained from the analysis of a total of 110 ks Chandra observations of 3C 320 FR II radio galaxy, located at the centre of a cluster of galaxies at a redshift $z=0.342$. A pair of X-ray cavities have been detected at an average distance ... More
Compositional differences between the component stars of eclipsing close binary systems showing chemical peculiaritiesFeb 13 2019A spectroscopic study was carried out on the surface chemical abundances of CNO and several heavier elements in the primary and secondary components of 5 eclipsing close binaries around A-type (AR Aur, beta Aur, YZ Cas, WW Aur, and RR Lyn), in order to ... More
Minimalist shear-driven large scale dynamoFeb 13 2019We show that non-axisymmetric, non-helical perturbations in an unstratified shear flow produce a shear-plane averaged electromotive force (EMF) rigorously proportional to a spatially dependent kinetic helicity. This new "shear-driven $\alpha$-effect" ... More
A limited habitable zone for complex lifeFeb 13 2019The habitable zone (HZ) is defined as the range of distances from a host star within which liquid water, a key requirement for life, may exist at a planet's surface. Substantially more CO2 than present in Earth's modern atmosphere is required to maintain ... More
Bell-Instability-Mediated Spectral Modulation of Hadronic Gamma Rays from a Supernova Remnant Interacting with a Molecular CloudFeb 13 2019Supernova remnants (SNRs) are believed to be the site of galactic cosmic-ray acceleration. However, the details of the cosmic-ray acceleration are still not well understood. Gamma ray observation is a promising method to study cosmic-ray acceleration ... More
The substructures in the local stellar halo from Gaia and LAMOSTFeb 13 2019Based on the second Gaia data release (Gaia DR2) and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we identified 20,089 halo stars kinematically and chemically. The halo streams in the solar neighborhood ... More
Wideband polarized radio emission from the newly revived radio magnetar XTE J1810$-$197Feb 13 2019The anomalous X-ray pulsar XTE J1810$-$197 was the first magnetar found to emit pulsed radio emission. After spending almost a decade in a quiescent, radio-silent state, the magnetar was reported to have undergone a radio outburst in early 2018 December. ... More
A model of high-energy emission from jets of microquasars of Population IIIFeb 12 2019Current research indicates that the radiation of the first stars alone would not have been suficient to ionize the intergalactic medium on long distances because of the high columnar density of the clouds in which they formed. It becomes necessary, then, ... More
Hydrodynamic and Magnetohydrodynamic Simulations of Wire TurbulenceFeb 12 2019We report on simulations of laboratory experiments in which magnetized supersonic flows are driven through a wire mesh. The goal of the study was to investigate the ability of such a configuration to generate supersonic, MHD turbulence. We first report ... More
Magnetic Properties and Flow Angle of the Inverse Evershed Flow at Its Downflow PointsFeb 12 2019We determined the direction and strength of the photospheric and lower chromospheric magnetic field in the umbra and penumbra of a sunspot from inversions of spectropolarimetric observations of photospheric lines at 617\,nm and 1565\,nm, and the chromospheric ... More
The survivability of planetary systems in young and dense star clustersFeb 12 2019We perform a simulation using the Astrophysical Multipurpose Software Environment of the Orion Trapezium star cluster in which the evolution of the stars and the dynamics of planetary systems are taken into account. The initial conditions are selected ... More
Spin evolution and feedback of supermassive black holes in cosmological simulationsFeb 12 2019It is well established that the properties of supermassive black holes and their host galaxies are correlated through scaling relations. While hydrodynamical cosmological simulations have begun to account for the co-evolution of BHs and galaxies, they ... More
Scattered moonlight observations with X-Shooter: Implications for the aerosol properties at Cerro Paranal and the ESO sky background modelFeb 12 2019Estimating the sky background is critical for ground-based astronomical research. In the optical, scattered moonlight dominates the sky background, when the moon is above the horizon. The most uncertain component of a scattered moonlight model is the ... More
Modular Inflation at Higher Level $N$Feb 12 2019We introduce the framework of modular inflation with level structure, generalizing the level one theory considered previously to higher levels. We analyze the modular structure of CMB observables in this framework and show that the nontrivial geometry ... More
Filaments in VIPERS: galaxy quenching in the infalling regions of groupsFeb 12 2019We study the quenching of galaxies in different environments and its evolution in the redshift range $0.43 \leq z \leq 0.89$. For this purpose, we identify galaxies inhabiting filaments, the isotropic infall region of groups, the field, and groups in ... More
Spatial segregation of dust grains in transition disks. SPHERE observations of 2MASS J16083070-3828268 and RXJ1852.3-3700Feb 12 2019Context. The mechanisms governing the opening of cavities in transition disks are not fully understood. Several processes have been proposed but their occurrence rate is still unknown. Aims. We present spatially resolved observations of two transition ... More
Super-Eddington accretion discs with advection and outflows around magnetized neutron starsFeb 12 2019We present a model for a super-Eddington accretion disc around a magnetized neutron star taking into account advection of heat and the mass loss by the wind. The model is semi-analytical and predicts radial profiles of all basic physical characteristics ... More
Gravitational Waves from Compact Dark Objects in Neutron StarsFeb 12 2019Dark matter could be composed of compact dark objects (CDOs). We find that the oscillation of CDOs inside neutron stars can be a detectable source of gravitational waves (GWs). The GW strain amplitude depends on the mass of the CDO, and its frequency ... More
The consequences of planetary migration on the minor bodies of the early Solar SystemFeb 12 2019Pebble accretion is an efficient mechanism able to build up the core of the giant planets within the lifetime of the protoplanetary disc gas-phase. The core grows via this process until the protoplanet reaches its pebble isolation mass and starts to accrete ... More
Rediscovery of the Sixth Star Cluster in the Fornax Dwarf Spheroidal GalaxyFeb 12 2019Since first noticed by Shapley in 1939, a faint object coincident with the Fornax dwarf spheroidal has long been discussed as a possible sixth globular cluster system. However, debate has continued over whether this overdensity is a statistical artifact ... More
CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303Feb 12 2019We present the results of $^{12}$CO($J$=1-0) and $^{13}$CO($J$=1-0) simultaneous mappings toward the nearby barred spiral galaxy NGC 4303 as a part of the CO Multi-line Imaging of Nearby Galaxies (COMING) project. Barred spiral galaxies often show lower ... More
External photoevaporation of protoplanetary discs in Cygnus OB2: linking discs to star formation dynamical historyFeb 12 2019Many stars form in regions of enhanced stellar density, wherein the influence of stellar neighbours can have a strong influence on a protoplanetary disc (PPD) population. In particular, far ultraviolet (FUV) flux from massive stars drives thermal winds ... More
A Dark Matter Interpretation of the ANITA Anomalous EventsFeb 12 2019The ANITA collaboration recently reported the detection of two anomalous upward-propagating extensive air showers exiting the Earth with relatively large emergence angles and energies in the range $\mathcal{O}(0.5\!-\!1)~\mathrm{EeV}$. We interpret these ... More
Cosmic voids uncovered -- first-order statistics of depressions in the biased density fieldFeb 12 2019Cosmic voids are the major volume component in the matter distribution of the Universe. They posses great potential for constraining dark energy as well as for testing theories of gravity. Nevertheless, in spite of their growing popularity as cosmological ... More
Can supernova kicks trigger EMRIs in the Galactic Centre?Feb 12 2019One of the most promising gravitational wave (GW) sources detectable by the forthcoming LISA observatory are the so-called extreme-mass ratio inspirals (EMRIs), i.e. GW-driven inspirals of stellar-mass compact objects onto supermassive black holes (SMBHs). ... More
The formation and evolution of low-surface-brightness galaxiesFeb 12 2019Our statistical understanding of galaxy evolution is fundamentally driven by objects that lie above the surface-brightness limits of current wide-area surveys (mu ~ 23 mag arcsec^-2). While both theory and small, deep surveys have hinted at a rich population ... More
The FeII/MgII flux ratio of low-luminosity quasars at z~3Feb 12 2019The FeII/MgII line flux ratio has been used to investigate the chemical evolution of high redshift active galactic nuclei (AGNs). No strong evolution has been found out to z~6, implying that the type 1a supernova activity has been already occurred in ... More
New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5 $Feb 12 2019We present the results of a model-independent investigation of the rest-frame UV spectra from a comprehensive sample of $394$ quasars in the redshift range $1.5\leq z \leq 7.5$. We fit the main Broad Emission Lines (BELs) in the rest-frame range $1280$ ... More