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Solving the puzzle of discrepant quasar variability on monthly
time-scales implied by SDSS and CRTS data sets: We present an improved photometric error analysis for the 7,100 CRTS
(Catalina Real-Time Transient Survey) optical light curves for quasars from the
SDSS (Sloan Digital Sky Survey) Stripe 82 catalogue. The S... | astro-ph_GA |
Understanding Galaxy Mergers & AGN Feedback with UVIT: Simulations expect an enhanced star-formation and active galactic nuclei
(AGN) activity during galaxy mergers, which can lead to formation of
binary/dual AGN. AGN feedback can enhance or suppress star-formation. We have
carried out a pilot study of a sample of 10 d... | astro-ph_GA |
Investigating 16 Open Clusters in the Kepler/K2-Gaia DR3 field. I.
Membership, Binary, and Rotation: Using data from the Gaia Data Release 3 (Gaia DR3) and Kepler/K2, we present
a catalog of 16 open clusters with ages ranging from 4 to 4000 Myr, which
provides detailed information on membership, binary systems, and r... | astro-ph_GA |
Searching for shocks in high-mass starless clump candidates: In order to search for shocks in the very early stage of star formation, we
performed single-point surveys of SiO J=1-0, 2-1 and 3-2 lines and the H$_2$CO
$2_{12}-1_{11}$ line toward a sample of 100 high-mass starless clump candidates
(SCCs) by using the Kore... | astro-ph_GA |
Properties of the Circumgalactic Medium in Cosmic Ray-Dominated Galaxy
Halos: We investigate the impact of cosmic rays (CRs) on the circumgalactic medium
(CGM) in FIRE-2 simulations, for ultra-faint dwarf through Milky Way (MW)-mass
halos hosting star-forming (SF) galaxies. Our CR treatment includes injection
by supe... | astro-ph_GA |
Preliminary results on SiO v=3 J=1-0 maser emission from AGB stars: We present the results of SiO maser observations at 43GHz toward two AGB
stars using the VLBA. Our preliminary results on the relative positions of the
different J=1-0 SiO masers (v=1,2 and 3) indicate that the current ideas on SiO
maser pumping could ... | astro-ph_GA |
Lyman-$α$ emission from a WISE-selected optically faint powerful
radio galaxy M151304.72-252439.7 at $z$ = 3.132: We report the detection of a large ($\sim90$ kpc) and luminous
$\mathrm{Ly\alpha}$ nebula [$L\mathrm{_{Ly\alpha}}$ = $(6.80\pm0.08)\times
10^{44}$] $\rm{\,erg\,s^{-1}}$ around an optically faint (r$>23$ m... | astro-ph_GA |
A Characteristic Mass Scale in the Mass-Metallicity Relation of Galaxies: We study the shape of the gas-phase mass-metallicity relation (MZR) of a
combined sample of present-day dwarf and high-mass star-forming galaxies using
IZI, a Bayesian formalism for measuring chemical abundances presented in Blanc
et al. 2015. We... | astro-ph_GA |
The creation and persistence of a misaligned gas disc in a simulated
early-type galaxy: Massive early-type galaxies commonly have gas discs which are kinematically
misaligned with the stellar component. These discs feel a torque from the stars
and the angular momentum vectors are expected to align quickly. We present... | astro-ph_GA |
Milky Way's Thick and Thin disk: Is there distinct thick disk?: This article is based on our discussion session on Milky Way models at the
592 WE-Heraeus Seminar, Reconstructing the Milky Way's History: Spectroscopic
Surveys, Asteroseismology and Chemodynamical models. The discussion focused on
the following question: ... | astro-ph_GA |
Galaxy to cloud scales: Simulations from the scales of isolated galaxies to clouds have been
instrumental in informing us about molecular cloud formation and evolution.
Simulations are able to investigate the roles of gravity, feedback, turbulence,
heating and cooling, and magnetic fields on the physics of the interste... | astro-ph_GA |
A population of galaxy-scale jets discovered using LOFAR: The effects of feedback from high luminosity radio-loud AGN have been
extensively discussed in the literature, but feedback from low-luminosity
radio-loud AGN is less well understood. The advent of high sensitivity, high
angular resolution, large field of view t... | astro-ph_GA |
The VVV Open Cluster Project. Near-infrared sequences of NGC6067,
NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20: Open clusters are central elements of our understanding of the Galactic disk
evolution, as an accurate determination of their parameters leads to an
unbiased picture of our Galaxy's structure. Ext... | astro-ph_GA |
Massive Galaxies Impede Massive Outflows: A set of 66 3D hydrodynamical simulations explores how galactic stellar mass
affects three-phase, starburst-driven outflows. Simulated velocities are
compared to two basic analytic models: with (Johnson \& Axford 1971) and
without (Chevalier \& Clegg 1985) a gravitational poten... | astro-ph_GA |
Structural parameters and possible association of the Ultra-Faint Dwarfs
Pegasus III and Pisces II from deep Hubble Space Telescope photometry: We present deep Hubble Space Telescope (HST) photometry of the ultra-faint
dwarf (UFD) galaxies Pegasus III (Peg III) and Pisces II (Psc II), two of the
most distant satellit... | astro-ph_GA |
Selection bias in dynamically-measured supermassive black hole samples:
Scaling relations and correlations between residuals in semi-analytic galaxy
formation models: Recent work has confirmed that the masses of supermassive black holes,
estimated from scaling relations with global properties such as the stellar
ma... | astro-ph_GA |
Tracing the Local Volume galaxy halo-to-stellar mass ratio with
satellite kinematics: Rapid advance has been made recently in accurate distance measurements for
nearby ($D < 11$ Mpc) galaxies based on the magnitude of the tip of red giant
branch stars resolved with the Hubble Space Telescope. We use observational
pro... | astro-ph_GA |
A law of motion for spherical shells in special relativity: Self-similar solutions to the problem of a special relativistic law of motion
for thin shells of matter are calculated. These solutions represent the special
relativistic generalization of momentum conservation for the thin layer
approximation in classical phy... | astro-ph_GA |
A z=2.5 protocluster associated with the radio galaxy MRC 2104-242: star
formation and differing mass functions in dense environments: We present results from a narrow-band survey of the field around the high
redshift radio galaxy MRC 2104-242. We have selected Halpha emitters in a
7sq.arcmin field and compared the m... | astro-ph_GA |
Lessons from Comparisons between the Nuclear Region of the Milky Way &
Those in Nearby Spirals: The Milky Way appears is a typical barred spiral, and comparisons can be made
between its nuclear region and those of structurally similar nearby spirals.
Maffei 2, M83, IC 342 and NGC 253 are nearby systems whose nuclear ... | astro-ph_GA |
Radio Jet Feedback and Star Formation in Heavily Obscured Quasars at
Redshifts ~0.3-3, I: ALMA Observations: We present ALMA 870 micron (345 GHz) data for 49 high redshift (0.47<z<2.85),
luminous (11.7 < log L(bol) (Lsun) < 14.2) radio-powerful AGN, obtained to
constrain cool dust emission from starbursts concurrent ... | astro-ph_GA |
On the distribution of the Cold Neutral Medium in galaxy discs: The Cold Neutral Medium (CNM) is an important part of the galactic gas cycle
and a precondition for the formation of molecular and star forming gas, yet its
distribution is still not fully understood. In this work we present extremely
high resolution simul... | astro-ph_GA |
On estimating angular momenta of infalling protostellar cores from
observations: We use numerical simulations of molecular cloud formation in the colliding
flow scenario to investigate the reliability of observational estimates of the
angular momenta of early-state, low-mass protostellar cores. We show that, with
sui... | astro-ph_GA |
Narrow double-peaked emission lines of SDSS J131642.90+175332.5:
signature of a single or a binary AGN in a merger, jet-cloud interaction, or
unusual narrow-line region geometry: We present an analysis of the active galaxy SDSS J131642.90+175332.5, which
is remarkable because all of its narrow emission lines are do... | astro-ph_GA |
Dynamics of Starbursting Dwarf Galaxies. III. A HI study of 18 nearby
objects: We investigate the dynamics of starbursting dwarf galaxies, using both new
and archival HI observations. We consider 18 nearby galaxies that have been
resolved into single stars by HST observations, providing their star formation
history a... | astro-ph_GA |
Mapping the Interstellar Reddening and Extinction towards Baade's Window
Using Minimum Light Colors of ab-type RR Lyrae Stars. Revelations from the
De-reddened Color-Magnitude Diagrams: We have obtained repeated images of 6 fields towards the Galactic bulge in 5
passbands (u, g, r, i, z) with the DECam imager on th... | astro-ph_GA |
PAH Spectroscopy from 1-5 $μ$m: The PAH model predicts many weak emission features in the 1-5 $\mu$m region
that can resolve significant questions that it has faced since its inception in
the mid-80s. These features contain fundamental information about the PAH
population that is inaccessible via the much stronger PAH ... | astro-ph_GA |
Heavy Element Absorption Systems at $5.0<z<6.8$: Metal-Poor Neutral Gas
and a Diminishing Signature of Highly Ionized Circumgalactic Matter: Ratios of different ions of the same element encode ionization information
independently from relative abundances in quasar absorption line systems,
crucial for understanding th... | astro-ph_GA |
Chemical Diversity in the Ultra-faint Dwarf Galaxy Tucana II: We present the first detailed chemical abundance study of the ultra-faint
dwarf galaxy Tucana II based on high-resolution Magellan/MIKE spectra of four
red giant stars. The metallicity of these stars ranges from [Fe/H] = -3.2 to
-2.6, and all stars are low i... | astro-ph_GA |
Water emission from the high-mass star-forming region IRAS 17233-3606.
High water abundances at high velocities: We investigate the physical and chemical processes at work during the
formation of a massive protostar based on the observation of water in an
outflow from a very young object previously detected in H2 and... | astro-ph_GA |
TREX: Kinematic Characterisation of a High-Dispersion Intermediate-Age
Stellar Component in M33: The dwarf galaxy Triangulum (M33) presents an interesting testbed for
studying stellar halo formation: it is sufficiently massive so as to have
likely accreted smaller satellites, but also lies within the regime where
fee... | astro-ph_GA |
Self-similarity in the chemical evolution of galaxies and the delay time
distribution of SNe Ia: Recent improvements in the age dating of stellar populations and single stars
allow us to study the ages and abundance of stars and galaxies with
unprecedented accuracy. We here compare the relation between age and
\alpha... | astro-ph_GA |
Line shapes in narrow-line Seyfert 1 galaxies: a tracer of physical
properties?: Line profiles can provide fundamental information on the physics of active
galactic nuclei (AGN). In the case of narrow-line Seyfert 1 galaxies (NLS1s)
this is of particular importance since past studies revealed how their
permitted line... | astro-ph_GA |
Inferring the star formation histories of the most massive and passive
early-type galaxies at z<0.3: Massive galaxies are key probes to understand how the baryonic matter evolves
within the dark matter halos. We use the "archaeological" approach to infer the
stellar population properties and star formation histories ... | astro-ph_GA |
A Search For Supernova Remnants in The Nearby Spiral Galaxy M74 (NGC
628): We have identified nine new SNR candidates in M74 with [S II]/H$\alpha$
$\geq$ 0.4 as the basic criterion. We obtain [S II]/H$\alpha$ ratio in the
range from 0.40 to 0.91 and H$\alpha$ intensities from 2.8 $\times$ $10^{-15}$
erg cm$^{-2}$ s$^... | astro-ph_GA |
Abundance gradients in spiral disks: is the gradient inversion at high
redshift real?: We compute the abundance gradients along the disk of the Milky Way by means
of the two-infall model: in particular, the gradients of oxygen and iron and
their temporal evolution. First, we explore the effects of several physical
pr... | astro-ph_GA |
Impact of turbulence intensity and fragmentation velocity on dust
particle size evolution and non-ideal magnetohydrodynamics effects: We investigate the influence of dust particle size evolution on non-ideal
magnetohydrodynamic effects during the collapsing phase of star-forming cores,
taking both the turbulence inte... | astro-ph_GA |
Stellar Dynamics and Stellar Phenomena Near A Massive Black Hole: Most galactic nuclei harbor a massive black hole (MBH), whose birth and
evolution are closely linked to those of its host galaxy. The unique conditions
near the MBH: high velocity and density in the steep potential of a massive
singular relativistic obje... | astro-ph_GA |
The angular momentum of disc galaxies at z=1: We investigate the relation between stellar mass and specific stellar angular
momentum, or `Fall relation', for a sample of 17 isolated, regularly rotating
disc galaxies at z=1. All galaxies have a) rotation curves determined from
Halpha emission-line data; b) HST imaging i... | astro-ph_GA |
Evaluating the Magnetorotational Instability's Dependence on Numerical
Algorithms and Resolution: We have studied saturated, MRI-driven turbulence using three-dimensional,
isothermal simulations with resolutions that extend from 64 to 192 zones in
each direction. The simulations were performed with several higher ord... | astro-ph_GA |
Neutral island statistics during reionization from 21-cm tomography: We present the prospects of extracting information about the Epoch of
Reionization by identifying the remaining neutral regions, referred to as
islands, in tomographic observations of the redshifted 21-cm signal. Using
simulated data sets we show that... | astro-ph_GA |
Surface chemistry in the interstellar medium - I - H2 formation by
Langmuir-Hinshelwood and Eley-Rideal mechanisms: H2 formation remains a major issue for the understanding of interstellar
physics. We investigate H2 formation in the interstellar medium at the light of
the most recent experimental and theoretical data... | astro-ph_GA |
Constraining UV Continuum Slopes of Active Galactic Nuclei With CLOUDY
Models of Broad Line Region EUV Emission Lines: Understanding the composition and structure of the broad-line region (BLR) of
active galactic nuclei (AGN) is important for answering many outstanding
questions in supermassive black hole evolution, ... | astro-ph_GA |
The JCMT Gould Belt Survey: First results from SCUBA-2 observations of
the Cepheus Flare Region: We present observations of the Cepheus Flare obtained as part of the James
Clerk Maxwell Telescope (JCMT) Gould Belt Legacy Survey (GBLS) with the SCUBA-2
instrument. We produce a catalogue of sources found by SCUBA-2, an... | astro-ph_GA |
EMPRESS. XI. SDSS and JWST Search for Local and z~4-5 Extremely
Metal-Poor Galaxies (EMPGs): Clustering and Chemical Properties of Local
EMPGs: We search for local extremely metal-poor galaxies (EMPGs), selecting
photometric candidates by broadband color excess and machine-learning
techniques with the SDSS photomet... | astro-ph_GA |
Fullerenes in circumstellar and interstellar environments: In recent years, the fullerene species C60 (and to a lesser extent also C70)
has been reported in the mid-IR spectra of various astronomical objects. Cosmic
fullerenes form in the circumstellar material of evolved stars, and survive in
the interstellar medium (... | astro-ph_GA |
Reconciling the emission mechanism discrepancy in Mira's tail, and its
evolution in an interface with shear: GALEX observations of the Mira AB binary system revealed a surrounding
structure that has been successfully hydrodynamically interpreted as a bow
shock and tail of ram-pressure-stripped material. Even the narr... | astro-ph_GA |
BiPoS1 -- a computer programme for the dynamical processing of the
initial binary star population: The first version of the Binary Population Synthesizer (BiPoS1) is made
publicly available. It allows to efficiently calculate binary distribution
functions after the dynamical processing of a realistic population of bi... | astro-ph_GA |
A universal, turbulence-regulated star formation law: from Milky Way
clouds to high-redshift disk and starburst galaxies: Whilst the star formation rate (SFR) of molecular clouds and galaxies is key
in understanding galaxy evolution, the physical processes which determine the
SFR remain unclear. This uncertainty abou... | astro-ph_GA |
The THESAN project: Lyman-alpha emitter luminosity function calibration: The observability of Lyman-alpha emitting galaxies (LAEs) during the Epoch of
Reionization can provide a sensitive probe of the evolving neutral hydrogen gas
distribution, thus setting valuable constraints to distinguish different
reionization mod... | astro-ph_GA |
Morphological evolution in situ: Disk-dominated cluster red sequences at
z ~ 1.25: We have carried out a joint photometric and structural analysis of red
sequence galaxies in four clusters at a mean redshift of z ~ 1.25 using optical
and near-IR HST imaging reaching to at least 3 magnitudes fainter than $M^*$.
As exp... | astro-ph_GA |
Seeking the growth of the first black hole seeds with JWST: In this paper we provide predictions for the BH population that would be
observable with planned JWST surveys at $5 \le z \le 15$. We base our study on
the recently developed Cosmic Archaeology Tool (CAT), which allows us to model
BH seeds formation and growth... | astro-ph_GA |
Mapping the Galactic Halo VIII: Quantifying substructure: We have measured the amount of kinematic substructure in the Galactic halo
using the final data set from the Spaghetti project, a pencil-beam high
latitude sky survey. Our sample contains 101 photometrically selected and
spectroscopically confirmed giants with a... | astro-ph_GA |
Radio Jet Feedback and Star Formation in Heavily Obscured Quasars at
Redshifts ~0.3-3, I: ALMA Observations: We present ALMA 870 micron (345 GHz) data for 49 high redshift (0.47<z<2.85),
luminous (11.7 < log L(bol) (Lsun) < 14.2) radio-powerful AGN, obtained to
constrain cool dust emission from starbursts concurrent ... | astro-ph_GA |
Evolution of dust extinction curves in galaxy simulation: To understand the evolution of extinction curve, we calculate the dust
evolution in a galaxy using smoothed particle hydrodynamics simulations
incorporating stellar dust production, dust destruction in supernova shocks,
grain growth by accretion and coagulation,... | astro-ph_GA |
30 Years of Star Formation at UKIRT: It's safe to say that UKIRT's contribution to star formation at
near-infrared, mid-infrared, and even sub-millimetre wavelengths has been
considerable. From the early days of single-detector photometers, through the
development of 2-D arrays and complex multi-mode imager-spectromete... | astro-ph_GA |
The cosmic abundance of cold gas in the local Universe: We determine the cosmic abundance of molecular hydrogen (H2) in the local
universe from the xCOLD GASS survey. To constrain the H2 mass function at low
masses and correct for the effect of the lower stellar mass limit of 10^9 Msun
in the xCOLD GASS survey, we use ... | astro-ph_GA |
Black hole mass measurement using ALMA observations of [CI] and CO
emissions in the Seyfert 1 galaxy NGC7469: We present a supermassive black hole (SMBH) mass measurement in the Seyfert 1
galaxy NGC7469 using Atacama Large Millimeter/submillimeter Array (ALMA)
observations of the atomic-${\rm [CI]}$(1-0) and molecula... | astro-ph_GA |
Chemical abundances of distant extremely metal-poor unevolved stars: Aims: The purpose of our study is to determine the chemical composition of a
sample of 16 candidate Extremely Metal-Poor (EMP) dwarf stars, extracted from
the Sloan Digital Sky Survey (SDSS). There are two main purposes: in the first
place to verify t... | astro-ph_GA |
Ionised gas structure of 100 kpc in an over-dense region of the galaxy
group COSMOS-Gr30 at z ~ 0.7: We report the discovery of a 10^4 kpc^2 gaseous structure detected in [OII]
in an over-dense region of the COSMOS-Gr30 galaxy group at z~0.725 thanks to
deep MUSE Guaranteed Time Observations. We estimate the total am... | astro-ph_GA |
Discovery of inverse-Compton X-ray emission and estimate of the
volume-averaged magnetic field in a galaxy group: Observed in a significant fraction of clusters and groups of galaxies,
diffuse radio synchrotron emission reveals the presence of relativistic
electrons and magnetic fields permeating large-scale systems ... | astro-ph_GA |
The PAU Survey: Close galaxy pairs identification and analysis: Galaxy pairs constitute the initial building blocks of galaxy evolution,
which is driven through merger events and interactions. Thus, the analysis of
these systems can be valuable in understanding galaxy evolution and studying
structure formation. In this... | astro-ph_GA |
Update on HI data collection from GBT, Parkes and Arecibo telescopes for
the Cosmic Flows project: Cosmic Flows is an international multi-element project with the goal to map
motions of galaxies in the Local Universe. Kinematic information from
observations in the radio HI line and photometry at optical or near-infra... | astro-ph_GA |
Constraints on the temperature inhomogeneity in quasar accretion discs
from the ultraviolet-optical spectral variability: The physical mechanisms of the quasar ultraviolet (UV)-optical variability
are not well understood despite the long history of observations. Recently,
Dexter & Agol presented a model of quasar UV-... | astro-ph_GA |
Molecular hydrogen in absorption at high redshifts. Science cases for
CUBES: Absorption lines from molecular hydrogen ($\rm H_2$) in the spectra of
background sources are a powerful probe of the physical conditions in
intervening cold neutral medium. At high redshift, $z>2$, $\rm H_2$ lines are
conveniently shifted i... | astro-ph_GA |
Mapping Spatial Variations of HI Turbulent Properties in the Small and
Large Magellanic Cloud: We developed methods for mapping spatial variations of the spatial power
spectrum (SPS) and structure function (SF) slopes, with a goal of connecting
neutral hydrogen (HI) statistical properties with the turbulent drivers. ... | astro-ph_GA |
New Insights into the Evolution of Massive Stars and Their Effects on
Our Understanding of Early Galaxies: The observable characteristics and subsequent evolution of young stellar
populations is dominated by their massive stars. As our understanding of those
massive stars and the factors affecting their evolution imp... | astro-ph_GA |
The physics and modes of star cluster formation: simulations: We review progress in numerical simulations of star cluster formation. These
simulations involve the bottom-up assembly of clusters through hierarchical
mergers, which produces a fractal stellar distribution at young (~0.5 Myr)
ages. The resulting clusters a... | astro-ph_GA |
Herschel/HIFI search for H2-17O and H2-18O in IRC+10216: constraints on
models for the origin of water vapor: We report the results of a sensitive search for the minor isotopologues of
water, H2-17O and H2-18O, toward the carbon-rich AGB star IRC+10216 (a.k.a. CW
Leonis) using the HIFI instrument on the Herschel Spac... | astro-ph_GA |
Young Galaxy Candidates in the Hubble Frontier Fields - III.
MACSJ0717.5+3745: In this paper we present the results of our search for and study of $z
\gtrsim 6$ galaxy candidates behind the third Frontier Fields (FF) cluster,
MACSJ0717.5+3745, and its parallel field, combining data from Hubble and
Spitzer. We select ... | astro-ph_GA |
ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A Hot Corino
Survey toward Protostellar Cores in the Orion Cloud: The presence of complex organic molecules (COMs) in the interstellar medium
(ISM) is of great interest since it may link to the origin and prevalence of
life in the universe. Aiming to investi... | astro-ph_GA |
The HI Gas Disk Thickness of the Ultra-diffuse Galaxy AGC 242019: Ultra-diffuse galaxies (UDGs) are as faint as dwarf galaxies but whose sizes
are similar to those of spiral galaxies. A variety of formation mechanisms have
been proposed, some of which could result in different disk thicknesses. In
this study, we measur... | astro-ph_GA |
The Spitzer Space Telescope Survey of the Orion A and B Molecular Clouds
II: the Spatial Distribution and Demographics of Dusty Young Stellar Objects: We analyze the spatial distribution of dusty young stellar objects (YSOs)
identified in the Spitzer Survey of the Orion Molecular clouds, augmenting
these data with Ch... | astro-ph_GA |
Dust temperature uncertainties hamper the inference of dust and
molecular gas masses from the dust continuum emission of quiescent
high-redshift galaxies: Single flux density measurements at observed-frame sub-millimeter and
millimeter wavelengths are commonly used to probe dust and gas masses in
galaxies. In this ... | astro-ph_GA |
Galactic fountains and the rotation of disc-galaxy coronae: In galaxies like the Milky Way, cold (~ 10^4 K) gas ejected from the disc by
stellar activity (the so-called galactic-fountain gas) is expected to interact
with the virial-temperature (~ 10^6 K) gas of the corona. The associated
transfer of momentum between co... | astro-ph_GA |
Evolution of dust grain size distribution and grain porosity in galaxies: The radiative properties of interstellar dust are affected not only by the
grain size distribution but also by the grain porosity. We develop a model for
the evolution of size-dependent grain porosity and grain size distribution over
the entire h... | astro-ph_GA |
The Galactic Center Lobe Filled with Thermal Plasma: An observational result of a radio continuum and H92$\alpha$ radio
recombination line of the Galactic Center Lobe (GCL), using the Yamaguchi 32 m
radio telescope, is reported. The obtained spatial intensity distribution of
the radio recombination line shows two disti... | astro-ph_GA |
VVV Survey Microlensing: the Galactic Longitude Dependence: We completed the search for microlensing events in the zero latitude area of
the Galactic bulge using the VVV Survey near-IR data obtained between 2010 and
2015. We have now a total sample of N = 630 events Using the near-IR
Color-Magnitude Diagram we selected... | astro-ph_GA |
Is there a maximum mass for black holes in galactic nuclei?: The largest observed supermassive black holes (SMBHs) have a mass of M_BH ~
10^{10} M_sun, nearly independent of redshift, from the local (z~0) to the
early (z>6) Universe. We suggest that the growth of SMBHs above a few 10^{10}
M_sun is prevented by small-sc... | astro-ph_GA |
A refined search for high-velocity gas in the Cygnus Loop supernova
remnant: We present the results of a sensitive search for high-velocity gas in
interstellar absorption lines associated with the Cygnus Loop supernova remnant
(SNR). We examine high-resolution, high signal-to-noise ratio optical spectra
of six stars ... | astro-ph_GA |
Ly-alpha Radiative Transfer: A Stokes Vector Approach to Ly-alpha
Polarization: Ly-alpha emitting galaxies and giant Ly-alpha blobs (LABs) have been
extensively observed to study the formation history of galaxies. However, the
origin of their extended Ly-alpha emission, especially of LABs, remains
controversial. Pola... | astro-ph_GA |
No Evidence for [O III] Variability in Mrk 142: Using archival data from the 2008 Lick AGN Monitoring Project, Zhang & Feng
(2016) claimed to find evidence for flux variations in the narrow [O III]
emission of the Seyfert 1 galaxy Mrk 142 over a two-month time span. If
correct, this would imply a surprisingly compact s... | astro-ph_GA |
New Limits on an Intermediate Mass Black Hole in Omega Centauri: I.
Hubble Space Telescope Photometry and Proper Motions: We analyze data from the Hubble Space Telescope's Advanced Camera for Surveys
of the globular cluster Omega Cen. We construct a photometric and proper-motion
catalog using the GO-9442, GO-10252, a... | astro-ph_GA |
SAMI-HI: The HI view of the H$α$ Tully-Fisher relation and data
release: We present SAMI-HI, a survey of the atomic hydrogen content of 296 galaxies
with integral field spectroscopy available from the SAMI Galaxy Survey. The
sample spans nearly 4 dex in stellar mass ($M_\star = 10^{7.4}-10^{11.1}~ \rm
M_\odot$), reds... | astro-ph_GA |
Another Look at the EBS: A Stellar Debris Stream and a Possible
Progenitor: Using the Sloan Digital Sky Survey Data Release 7, we reexamine the Eastern
Banded Structure (EBS), a stellar debris stream first discovered in Data
Release 5 and more recently detected in velocity space by Schlaufman et al. The
visible porti... | astro-ph_GA |
Toward an Empirical Theory of Pulsar Emission. IX. On the Peculiar
Properties and Geometric Regularity of Lyne & Manchester's "Partial Cone"
Pulsars: Lyne & Manchester (1988) identified a group of some 50 pulsars they called
"partial cones" which they found difficult to classify and interpret. They were
notable for... | astro-ph_GA |
Predicting Images for the Dynamics Of stellar Clusters (π-DOC): a
deep learning framework to predict mass, distance and age of globular
clusters: Dynamical mass estimates of simple systems such globular clusters (GCs) still
suffer from up to a factor of 2 uncertainty. This is primarily due to the
oversimplification... | astro-ph_GA |
First [NII]122$μ$m line detection in a QSO-SMG pair BRI 1202-0725 at
$z=4.69$: We report the first detection obtained with ALMA of the [N II] 122$\mu$m line
emission from a galaxy group BRI 1202-0725 at $z=4.69$ consisting of a QSO and
a submilimeter-bright galaxy (SMG). Combining with a detection of [N II]
205$\mu$m... | astro-ph_GA |
The role of the Galactic bar in the chemical evolution of the Milky Way: In the absence of an interaction, central bars might be the most effective
mechanism for radial motions of gas in barred spiral galaxies, which represent
two-thirds of disc galaxies. The dynamical effects induced by bars in the first
few kpc of di... | astro-ph_GA |
The impact of stripped Nuclei on the Super-Massive Black Hole number
density in the local Universe: The recent discovery of super-massive black holes (SMBHs) in the centers of
high-mass ultra compact dwarf galaxies (UCDs) suggests that at least some UCDs
are the stripped nuclear star clusters of lower mass galaxies. ... | astro-ph_GA |
Gas accretion onto the disc of a simulated Milky Way-mass galaxy: In the standard paradigm of galaxy formation and evolution, the baryonic
component of galaxies forms from the collapse and condensation of gas within
dark matter haloes, and later grows from continuous accretion of gaseous mass,
both in diffuse form and ... | astro-ph_GA |
Hierarchical Bayesian inference of the Initial Mass Function in
Composite Stellar Populations: The initial mass function (IMF) is a key ingredient in many studies of galaxy
formation and evolution. Although the IMF is often assumed to be universal,
there is continuing evidence that it is not universal. Spectroscopic ... | astro-ph_GA |
Reproducing sub-millimetre galaxy number counts with cosmological
hydrodynamic simulations: Matching the number counts of high-$z$ sub-millimetre-selected galaxies
(SMGs) has been a long standing problem for galaxy formation models. In this
paper, we use 3D dust radiative transfer to model the sub-mm emission from
ga... | astro-ph_GA |
A High Resolution Study of the Atomic Hydrogen in CO-Rich Early-Type
Galaxies: We present an analysis of new and archival VLA HI observations of a sample of
eleven early-type galaxies rich in CO, with detailed comparisons of CO and HI
distributions and kinematics. The early-type sample consists of both lenticular
and... | astro-ph_GA |
Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254):
Enhanced [C II] emission in the collisionally-formed bridge: Using the PACS and SPIRE spectrometers on-board Herschel, we obtained
observations of the Taffy galaxies (UGC 12914/12915) and bridge. The Taffy
system is believed to be the result of a... | astro-ph_GA |
No evidence for large-scale outflows in the extended ionised halo of
ULIRG Mrk273: We present deep new GTC/OSIRIS narrow-band images and optical WHT/ISIS
long-slit spectroscopy of the merging system Mrk273 that show a spectacular
extended halo of warm ionised gas out to a radius of $\sim45$ kpc from the
system nucleu... | astro-ph_GA |
Differences in Halo-Scale Environments between Type 1 and Type 2 AGNs at
Low Redshift: Using low-redshift (z<0.09) samples of AGNs, normal galaxies and groups of
galaxies selected from the Sloan Digital Sky Survey (SDSS), we study the
environments of type 1 and type 2 AGNs both on small and large scales.
Comparisons ... | astro-ph_GA |
HI absorption spectra for Supernova Remnants in the VGPS survey: The set of supernova remnants (SNR) from Green's SNR catalog which are found
in the VLA Galactic Plane Survey (VGPS) are the objects considered in this
study. For these SNR, we extract and analyse HI absorption spectra in a uniform
way and construct a cat... | astro-ph_GA |
Outflows, Accretion, and Clustered Protostellar Cores around a Forming O
Star: We present a Submillimeter Array study in the 1.3 mm waveband of the NGC 7538
IRS 1--3 massive star-forming region. The brightest core in the mm continuum
map, MM1, harbors the IRS 1 young O star. The core has a gas temperature of
about 24... | astro-ph_GA |
Stochastic 2-D Models of Galaxy Disk Evolution. The Galaxy M33: We have developed a fast numerical 2-D model of galaxy disk evolution
(resolved along the galaxy radius and azimuth) by adopting a scheme of
parameterized stochastic self-propagating star formation. We explore the
parameter space of the model and demonstra... | astro-ph_GA |
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