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SDSS-IV MaNGA: Spatially resolved star-formation histories and the
connection to galaxy physical properties: A key task of observational extragalactic astronomy is to determine where --
within galaxies of diverse masses and morphologies -- stellar mass growth
occurs, how it depends on galaxy properties and what proce... | astro-ph_GA |
Revisiting the Mass-Excitation (MEx) diagram using the MaNGA dataset: The diagram comparing the flux ratio of the [OIII] and H$\beta$ emission
lines with the total stellar mass of galaxies (also known as the
mass-excitation diagram, MEx) has been widely used to classify the ionization
mechanism in high redshift galaxie... | astro-ph_GA |
Dynamic Localised Turbulent Diffusion and its Impact on the Galactic
Ecosystem: Modelling the turbulent diffusion of thermal energy, momentum, and metals is
required in all galaxy evolution simulations due to the ubiquity of turbulence
in galactic environments. The most commonly employed diffusion model, the
Smagorin... | astro-ph_GA |
Trans-cis molecular photoswitching in interstellar Space: As many organic molecules, formic acid (HCOOH) has two conformers (trans and
cis). The energy barrier to internal conversion from trans to cis is much
higher than the thermal energy available in molecular clouds. Thus, only the
most stable conformer (trans) is e... | astro-ph_GA |
Extracting galaxy merger timescales I: Tracking haloes with WhereWolf
and spinning orbits with OrbWeaver: Hierarchical models of structure formation predict that dark matter halo
assembly histories are characterised by episodic mergers and interactions with
other haloes. An accurate description of this process will p... | astro-ph_GA |
HST imaging of the brightest z~8-9 galaxies from UltraVISTA: the extreme
bright end of the UV luminosity function: We report on the discovery of three especially bright candidate $z_{phot}
\gtrsim 8$ galaxies. Five sources were targeted for follow-up with HST/WFC3,
selected from a larger sample of 16 bright ($24.8 \l... | astro-ph_GA |
The chemical evolution of local star forming galaxies: Radial profiles
of ISM metallicity, gas mass, and stellar mass and constraints on galactic
accretion and winds: The radially averaged metallicity distribution of the ISM and the young
stellar population of a sample of 20 disk galaxies is investigated by means o... | astro-ph_GA |
Study of rotation curves of spiral galaxies with a scalar field dark
matter model: In this work we study rotation curves of spiral galaxies using a model of
dark matter based on a scalar-tensor theory of gravity. We show how to estimate
the scalar field dark matter parameters using a sample of observed rotation
curve... | astro-ph_GA |
Understanding inverse metallicity gradients in galactic discs as a
consequence of inside-out formation: The early stages of a galaxy's evolution leave an imprint on its metallicity
distribution. We discuss the origins and evolution of radial metallicity
gradients in discs of spiral galaxies using an analytical chemic... | astro-ph_GA |
The ACS Nearby Galaxy Survey Treasury: The ACS Nearby Galaxy Survey Treasury (ANGST) is a systematic survey to
establish a legacy of uniform multi-color photometry of resolved stars for a
volume-limited sample of nearby galaxies (D<4 Mpc). The survey volume
encompasses 69 galaxies in diverse environments, including clo... | astro-ph_GA |
Stellar masses, sizes, and radial profiles for 465 nearby early-type
galaxies: an extension to the Spitzer Survey of Stellar Structure in Galaxies
(S$^{4}$G): The Spitzer Survey of Stellar Structure in Galaxies (S$^{4}$G) is a detailed
study of over 2300 nearby galaxies in the near-infrared (NIR), which has been
cr... | astro-ph_GA |
The quasar main sequence and its potential for cosmology: The main sequence offers a method for the systematization of quasar spectral
properties. Extreme FeII emitters (or extreme Population A, xA) are believed to
be sources accreting matter at very high rates. They are easily identifiable
along the quasar main sequen... | astro-ph_GA |
Two sequences of spiral galaxies with different shapes of the
metallicity gradients: We considered two sequences of spiral galaxies with different shapes of the
radial gas-phase oxygen abundance distributions from the galaxies in the MaNGA
survey: (1) Galaxies in which the gradient is well approximated by a single
li... | astro-ph_GA |
New constraints on the 1.4 GHz source number counts and luminosity
functions in the Lockman Hole field: We present a study of the 1173 sources brighter than $S_{1.4\,\rm GHz}=
120\,\mu$Jy detected over an area of $\simeq 1.4\,\hbox{deg}^{2}$ in the
Lockman Hole field. Exploiting the multi-band information available i... | astro-ph_GA |
The Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop: We observed the northern rim of the Cygnus Loop with the \textit{Suzaku}
observatory in 5 pointings (P21-P25). From the spatially resolved analysis, all
the spectra are well fitted by the single component of the non-equilibrium
ionization plasma model.... | astro-ph_GA |
Mapping the stellar population and gas excitation of MaNGA galaxies with
MEGACUBES. Results for AGN versus control sample: We present spaxel-by-spaxel stellar population fits for the $\sim$10 thousand
MaNGA datacubes. We provide multiple extension fits files, nominated as
MEGACUBES, with maps of several properties as... | astro-ph_GA |
Chemical evolution in the early phases of massive star formation II:
Deuteration: The chemical evolution in high-mass star-forming regions is still poorly
constrained. Studying the evolution of deuterated molecules allows to
differentiate between subsequent stages of high-mass star formation regions due
to the strong... | astro-ph_GA |
VLT/X-Shooter Survey of BAL Quasars: Large Distance Scale and AGN
Feedback: We conducted a survey of quasar outflows using the VLT/X-shooter
spectrograph. When choosing the 14 BAL and mini-BALs comprising this sample,
the data did not cover the S IV and S IV* troughs, whose ratio can be used to
determine the distance... | astro-ph_GA |
The discovery of lensed radio and X-ray sources behind the Frontier
Fields cluster MACS J0717.5+3745 with the JVLA and Chandra: We report on high-resolution JVLA and Chandra observations of the HST
Frontier Cluster MACS J0717.5+3745. MACS J0717.5+3745 offers the largest
contiguous magnified area of any known cluster,... | astro-ph_GA |
Estimation of the size and structure of the broad line region using
Bayesian approach: Understanding the geometry and kinematics of the broad line region (BLR) of
active galactic nuclei (AGN) is important to estimate black hole masses in AGN
and study the accretion process. The technique of reverberation mapping (RM)... | astro-ph_GA |
The Magnetic Field of the Milky Way Galaxy: Cosmic magnetic fields are an integral component of the interstellar medium
(ISM), having influence on scales ranging from star formation to galactic
dynamics. While observations of external galaxies offer a `birds-eye-view' of
magnetic fields within galaxies, it is equally i... | astro-ph_GA |
The Bardeen-Petterson effect in accreting supermassive black-hole
binaries: a systematic approach: Disc-driven migration is a key evolutionary stage of supermassive black-hole
binaries hosted in gas-rich galaxies. Besides promoting the inspiral, viscous
interactions tend to align the spins of the black holes with the... | astro-ph_GA |
Theoretical Models of the Atomic Hydrogen Content in Dark Matter Halos: Atomic hydrogen (H I) gas, mostly residing in dark matter halos after cosmic
reionization, is the fuel for star formation. Its relation with properties of
host halo is the key to understand the cosmic H I distribution. In this work,
we propose a fl... | astro-ph_GA |
The effect of the morphological quenching mechanism on star formation
activity at 0.5 < z < 1.5 in 3D-HST/CANDELS: Several mechanisms for the transformation of blue star-forming to red
quiescent galaxies have been proposed, and the green valley (GV) galaxies amid
them are widely accepted in a transitional phase. Thus... | astro-ph_GA |
Standoff Distance of Bow Shocks in Galaxy Clusters as Proxy for Mach
Number: X-ray observations of merging clusters provide many examples of bow shocks
leading merging subclusters. While the Mach number of a shock can be estimated
from the observed density jump using Rankine-Hugoniot condition, it reflects
only the v... | astro-ph_GA |
A slow lopsided bar in the interacting dwarf galaxy IC 3167: We present surface photometry and stellar kinematics of IC 3167, a dwarf
galaxy hosting a lopsided weak bar and infalling into the Virgo cluster. We
measured the bar radius and strength from broad-band imaging and bar pattern
speed by applying the Tremaine-We... | astro-ph_GA |
Amplification of OAM Radiation by Astrophysical Masers: We extend the theory of astrophysical maser propagation through a medium with
a Zeeman-split molecular response to the case of a non-uniform magnetic field,
and allow a component of the electric field of the radiation in the direction
of propagation: a characteris... | astro-ph_GA |
Superhydrogenated Polycyclic Aromatic Hydrocarbon Molecules: Vibrational
Spectra in the Infrared: Superhydrogenated polycyclic aromatic hydrocarbons (PAHs) may be present in
H-rich and ultraviolet-poor benign regions. The addition of excess H atoms to
PAHs converts the aromatic bonds into aliphatic bonds, the stronge... | astro-ph_GA |
Obscuration in AGNs: near-infrared luminosity relations and dust colors: We combine two approaches to isolate the AGN luminosity at near-infrared
wavelengths and relate the near-IR pure AGN luminosity to other tracers of the
AGN. Using integral-field spectroscopic data of an archival sample of 51 local
AGNs, we estimat... | astro-ph_GA |
The mm-to-cm SED of spiral galaxies. Synergies between NIKA2 and SRT
instruments: The mm-to-cm range of the Spectral Energy Distribution of spiral galaxies
remains largely unexplored. Its coverage is required to disentangle the
contribution of dust emission, free-free and synchrotron radiation and can
provide constra... | astro-ph_GA |
Interaction effects on galaxy pairs with GeminiGMOS-III: Stellar
population synthesis: We present an observational study of the impacts of the interactions on the
stellar population in a sample of galaxy pairs. Long-slit spectra in the
wavelength range 3440-7300 {\AA} obtained with the Gemini Multi-Object
Spectrograp... | astro-ph_GA |
ALMA Observations toward the starburst dwarf galaxy NGC 5253: I.
Molecular cloud properties and scaling relations: We present high-spatial-resolution ($\sim 0\farcs2$, or $\sim$3\,pc) CO(2--1)
observations of the nearest young starburst dwarf galaxy, NGC\,5253, taken with
the Atacama Large Millimeter/submillimeter Ar... | astro-ph_GA |
Star formation properties of galaxy cluster A1767: Abell 1767 is a dynamically relaxed, cD cluster of galaxies with a redshift
of 0.0703. Among 250 spectroscopically confirmed member galaxies within a
projected radius of 2.5r_{200}, 243 galaxies (~ 97%) are spectroscopically
covered by the Sloan Digital Sky Survey (SDS... | astro-ph_GA |
Molecular clouds in M51 from high-resolution extinction mapping: Here we present the cloud population extracted from M51, following the
application of our new high-resolution dust extinction technique to the galaxy
(Faustino Vieira et al. 2023). With this technique, we are able to image the
gas content of the entire di... | astro-ph_GA |
Methyl Acetate and its singly deuterated isotopomers in the interstellar
medium: Methyl acetate (CH_3COOCH_3) has been recently observed by IRAM 30 m radio
telescope in Orion though the presence of its deuterated isotopomers is yet to
be confirmed. We therefore study the properties of various forms of methyl
acetate,... | astro-ph_GA |
Diversity of Type Ia Supernovae Imprinted in Chemical Abundances: A time delay of Type Ia supernova (SN Ia) explosions hinders the imprint of
their nucleosynthesis on stellar abundances. However, some occasional cases
give birth to stars that avoid enrichment of their chemical compositions by
massive stars and thereby ... | astro-ph_GA |
Photometric properties of intermediate redshift Type Ia Supernovae
observed by SDSS-II Supernova Survey: We have analyzed multi-band light curves of 328 intermediate redshift (0.05
<= z < 0.24) type Ia supernovae (SNe Ia) observed by the Sloan Digital Sky
Survey-II Supernova Survey (SDSS-II SN Survey). The multi-band... | astro-ph_GA |
Comparing semi-analytic particle tagging and hydrodynamical simulations
of the Milky Way's stellar halo: Particle tagging is an efficient, but approximate, technique for using
cosmological N-body simulations to model the phase-space evolution of the
stellar populations predicted, for example, by a semi-analytic model... | astro-ph_GA |
Isolating signatures of major cloud-cloud collisions using
position-velocity diagrams: Collisions between giant molecular clouds are a potential mechanism for
triggering the formation of massive stars, or even super star clusters. The
trouble is identifying this process observationally and distinguishing it from
othe... | astro-ph_GA |
The role of AGN on the structure, kinematics and evolution of ETGs in
the Horizon simulations: Feedback processes play a fundamental role in the regulation of the star
formation (SF) activity in galaxies and, in particular, in the quenching of
early-type galaxies (ETGs) as has been inferred by observational and numer... | astro-ph_GA |
The Hector Survey: integral field spectroscopy of 100,000 galaxies: In March 2013, the Sydney--AAO Multi-object Integral field spectrograph
(SAMI) began a major survey of 3400 galaxies at the AAT, the largest of its
kind to date. At the time of writing, over a third of the targets have been
observed and the scientific ... | astro-ph_GA |
An enduring puzzle: the width variations of the 2175 Angstrom extinction
band: Graphene, a single infinite, planar, sheet of graphite, has the same
dielectric resonances as bulk graphite, but solid state theory indicates that
its features are about half as wide. Based on this theory, the dielectric
functions of mono-... | astro-ph_GA |
Extreme High-velocity Outflows from High-redshift BOSS Quasars: It is common to assume that all narrow absorption lines (NALs) at extreme
high-velocity shifts form in cosmologically intervening gas or galaxies
unrelated to quasars. However, previous detailed studies of individual quasars
have shown that some NALs at th... | astro-ph_GA |
Detection of anhydrous hydrochloric acid, HCl, in IRC+10216 with the
Herschel SPIRE and PACS spectrometers: We report on the detection of anhydrous hydrochloric acid (hydrogen chlorine,
HCl) in the carbon-rich star IRC+10216 using the spectroscopic facilities
onboard the Herschel satellite. Lines from J=1-0 up to J=7... | astro-ph_GA |
Velocity dispersion measurements of dwarf galaxies in the Coma cluster -
implications for the structure of the fundamental plane: We present intermediate-resolution spectroscopic data for a set of dwarf and
giant galaxies in the Coma Cluster, with -20.6 < M_R < -15.7. The photometric
and kinematic properties of the b... | astro-ph_GA |
X-ray Shadowing Experiments Toward Infrared Dark Clouds: We searched for X-ray shadowing toward two infrared dark clouds (IRDCs) using
the MOS detectors on XMM-Newton to learn about the Galactic distribution of
X-ray emitting plasma. IRDCs make ideal X-ray shadowing targets of 3/4 kev
photons due to their high column d... | astro-ph_GA |
E(B-V), N(H I) and N(H_2): We consider the structure of the N(H I) - E(B-V) relationship when H I is
measured in the 21 cm radio line and \EBV\ is defined by far-IR dust-derived
measures. We derive reddening-dependent corrections to N(H I) based on
interferometric absorption measurements over the past 30 years that fol... | astro-ph_GA |
Dissipation of AGN jets in a clumpy interstellar medium: Accreting supermassive black holes (SMBHs) frequently power jets that
interact with the interstellar/circumgalactic medium (ISM/CGM), regulating
star-formation in the galaxy. Highly supersonic jets launched by active
galactic nuclei (AGN) power a cocoon that conf... | astro-ph_GA |
NIR spectroscopic observation of massive galaxies in the protocluster at
z = 3.09: We present the results of near-infrared spectroscopic observations of the
$K$-band selected candidate galaxies in the protocluster at $z=3.09$ in the
SSA22 field. We observed 67 candidates with $K_{\rm AB}<24$ and confirmed
redshifts o... | astro-ph_GA |
ngVLA: Astrometry and Long Baseline Science: Recent advances in VLBI have led to astrometric accuracy exceeding that of
the Gaia mission goals. This chapter describes some important astrophysical
problems that can be addressed with sub-milliarcsecond imaging and
micro-arcsecond astrometry using the ngVLA with long base... | astro-ph_GA |
A $Gaia$ EDR3 search for tidal tails in disintegrating open clusters: We carry out a search for tidal tails in a sample of open clusters with known
relatively elongated morphology. We identify the member stars of these clusters
from the precise astrometric and deep photometric data from $Gaia$ Early Data
Release 3 usin... | astro-ph_GA |
Resolving the shocked gas in HH54 with Herschel: CO line mapping at high
spatial and spectral resolution: The HH54 shock is a Herbig-Haro object, located in the nearby Chamaeleon II
cloud. Observed CO line profiles are due to a complex distribution in density,
temperature, velocity, and geometry. Resolving the HH54 s... | astro-ph_GA |
Surface density effects in quenching: cause or effect?: There are very strong observed correlations between the specific
star-formation rates (sSFR) of galaxies and their mean surface mass densities,
{\Sigma}, as well as other aspects of their internal structure. These strong
correlations have often been taken to indic... | astro-ph_GA |
The pride of lions around Messier 105: We undertook a search for new dwarf galaxies in the Leo-I group using the
data from the DECaLS digital sky survey. Five new presumed members of this
group have been found in a wide vicinity of ${\rm M}\,105 ({\rm NGC}\,3379$).
Currently, the group has a population of $83$ galaxies... | astro-ph_GA |
Dark matter deficient galaxies in the Illustris flat-$Λ$CDM model
structure formation simulation: Surveying dark matter deficient galaxies (those with dark matter mass to
stellar mass ratio $M_{\rm dm}/M_{\rm star}<1$) in the Illustris simulation of
structure formation in the flat-$\Lambda$CDM cosmogony, we find $M_{... | astro-ph_GA |
Simulating MOS science on the ELT: Ly$α$ forest tomography: Mapping of the large-scale structure through cosmic time has numerous
applications in the studies of cosmology and galaxy evolution. At $z > 2$, the
structure can be traced by the neutral intergalactic medium (IGM) by way of
observing the Ly$\alpha$, forest to... | astro-ph_GA |
The H2O southern Galactic Plane Survey(HOPS): NH3 (1,1) and (2,2)
catalogues: The H2O Southern Galactic Plane Survey (HOPS) has mapped a 100 degree strip
of the Galactic plane (-70deg > l > 30deg, |b| < 0.5deg) using the 22-m Mopra
antenna at 12-mm wavelengths. Observations were conducted in on-the-fly mode
using the... | astro-ph_GA |
Understanding the X-ray spectral curvature of Mkn 421 using broadband
AstroSat observations: We present a time-resolved X-ray spectral study of the high energy peaked
blazar Mkn 421 using simultaneous broadband observations from the LAXPC and SXT
instruments on-board AstroSat. The ~ 400 ksec long observation taken du... | astro-ph_GA |
The physical properties of z>2 Lyman limit systems: new constraints for
feedback and accretion models: We study the physical properties of a homogeneous sample of 157
optically-thick absorption line systems at redshifts ~1.8-4.4, selected from a
high-dispersion spectroscopic survey of Lyman limit systems (LLSs). By m... | astro-ph_GA |
Extended narrow-line region in Seyfert galaxies: We present our recent results about the extended narrow-line region (ENLR) of
two nearby Seyfert 2 galaxies (IC 5063 and NGC 7212) obtained by modelling the
observed line profiles and spectra with composite models
(photoionization+shocks) in the different regions surroun... | astro-ph_GA |
SDSS J0159 as an outlier in the Mbh-sigma space: further clues to
support a central tidal disruption event?: In this Letter, properties of black hole (BH) mass are well checked for the
interesting object SDSS J0159, a changing-look AGN and also a host galaxy of a
tidal disruption event (TDE). Through spectral absorpt... | astro-ph_GA |
Herschel SPIRE and PACS observations of the red supergiant VY CMa:
analysis of the molecular line spectra: We present an analysis of the far-infrared and submillimetre molecular
emission line spectrum of the luminous M-supergiant VY CMa, observed with the
SPIRE and PACS spectrometers aboard the Herschel Space Observa... | astro-ph_GA |
The First VLBI Detection of a Spiral DRAGN Core: The existence of spiral DRAGNs challenges standard galaxy formation theories.
We present the first observation of 0313$-$192, the archetypal spiral DRAGN, at
VLBI resolutions. Spiral DRAGNs are Double Radio Sources Associated with
Galactic Nuclei (DRAGNs) that are hosted... | astro-ph_GA |
The mass-metallicity relation of local active galaxies: We systematically measure the gas-phase metallicities and the
mass-metallicity relation of a large sample of local active galaxies for the
first time. Observed emission-line fluxes from the Sloan Digital Sky Survey
(SDSS) are compared to a four-dimensional grid of... | astro-ph_GA |
On the possible common origin of M16 and M17: It has been suggested that the well-studied giant HII regions M16 and M17 may
have had a common origin, being an example of large-scale triggered star
formation. While some features of the distribution of the interstellar medium
in the region support this interpretation, no... | astro-ph_GA |
A Number of Nearby Moving Groups may be Fragments of Dissolving Open
Clusters: We propose that fourteen co-moving groups of stars uncovered by Kounkel &
Covey (2019) may be related to known nearby moving groups and bridge those and
nearby open clusters with similar ages and space velocities. This indicates
that known... | astro-ph_GA |
The Behavior of Selected Diffuse Interstellar Bands with Molecular
Fraction in Diffuse Atomic and Molecular Clouds: We study the behavior of eight diffuse interstellar bands (DIBs) in different
interstellar environments, as characterized by the fraction of hydrogen in
molecular form [$f$(H$_2$)], with comparisons to ... | astro-ph_GA |
Photon-Dominated Region Modeling of the [C I],[C II], and CO Line
Emission from a Boundary in the Taurus Molecular Cloud: We present [Ci] and [Cii] observations of a linear edge region in the Taurus
molecular cloud, and model this region as a cylindrically symmetric PDR exposed
to a low-intensity UV radiation field. ... | astro-ph_GA |
Constraining nuclear star cluster formation using MUSE-AO observations
of the early-type galaxy FCC47: Nuclear star clusters (NSCs) are found in at least 70% of all galaxies, but
their formation path is still unclear. In the most common scenarios, NSCs form
in-situ from the galaxy's central gas reservoir, through mer... | astro-ph_GA |
A 95 GHz Methanol Emission Survey Toward Eight Small Supernova Remnants: We report on a 95 GHz ($8_0-7_1$ A$^{+}$) methanol (CH$_3$OH) emission survey
with the Purple Mountain Observatory Delingha 13.7 m telescope. Eight supernova
remnants (SNRs) with angular size $\lesssim$ 10' were observed, but emission
was only det... | astro-ph_GA |
A sharp rise in the detection rate of broad absorption line variations
in a quasar SDSS J141955.26+522741.1: We present an analysis of the variability of broad absorption lines (BALs) in
a quasar SDSS J141955.26+522741.1 at $z=2.145$ with 72 observations from the
Sloan Digital Sky Survey Data Release 16 (SDSS DR16). ... | astro-ph_GA |
Chemical abundances in Seyfert galaxies -- V. The discovery of shocked
emission outside the AGN ionization axis: We present maps for the electron temperature in the inner kpc of three
luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini
GMOS-IFU observations at spatial resolutions of 110-280 p... | astro-ph_GA |
Mapping kiloparsec-scale structures in the extended HI disc of the
galaxy UGC 00439 by HI 21-cm absorption: We study the properties of HI gas in the outer regions (~2r_25) of a spiral
galaxy, UGC 00439 (z = 0.01769), using HI 21-cm absorption towards different
components of an extended background radio source, J0041$... | astro-ph_GA |
IMF radial gradients in most massive early-type galaxies: Using new long-slit spectroscopy obtained with X-Shooter at ESO-VLT, we
study, for the first time, radial gradients of optical and Near-Infrared
IMF-sensitive features in a representative sample of galaxies at the very
high-mass end of the galaxy population. The... | astro-ph_GA |
The density variance -- Mach number relation in supersonic, isothermal
turbulence: We examine the relation between the density variance and the mean-square Mach
number in supersonic, isothermal turbulence, assumed in several recent analytic
models of the star formation process. From a series of calculations of
supers... | astro-ph_GA |
A Robust Measure of Dark Matter Halo Ellipticities: In simulations of the standard cosmological model (LCDM), dark matter halos
are aspherical. However, so far the asphericity of an individual galaxy's halo
has never been robustly established. We use the Jeans equations to define a
quantity which robustly characterizes... | astro-ph_GA |
A binning-free method reveals a continuous relationship between
galaxies' AGN power and offset from main sequence: Studies investigating the relationship between AGN power and the star
formation rates (SFRs) of their host galaxies often rely on averaging
techniques -- such as stacking -- to incorporate information fr... | astro-ph_GA |
Schwarzschild dynamical model of the Fornax dwarf spheroidal galaxy: We present a full dynamical model of the Fornax dwarf spheroidal galaxy
obtained with the spherically symmetric Schwarzschild orbit superposition
method applied to the largest kinematic data set presently available. We
modelled the total mass content ... | astro-ph_GA |
Symplectic coarse graining approach to the dynamics of spherical
self-gravitating systems: We investigate the evolution of the phase-space distribution function around
slightly perturbed stationary states and the process of violent relaxation in
the context of the dissipationless collapse of an isolated spherical
sel... | astro-ph_GA |
Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2: We use a sample of ~350 RR Lyrae stars with radial velocities and Gaia DR2
proper motions to study orbital properties of the Hercules-Aquila Cloud (HAC)
and Virgo Over-density (VOD). We demonstrate that both structures are dominated
by stars on highly ecce... | astro-ph_GA |
Studying the late evolution of a radio-loud AGN in a galaxy group with
LOFAR: Feedback by radio-loud active galactic nuclei (AGN) in galaxy groups is not
fully understood. Open questions include the duty cycle of the AGN, the spatial
extent of the radio lobes, the effect they have on the intragroup medium, and
the fa... | astro-ph_GA |
Circum-galactic medium in the halo of quasars: The properties of circum-galactic gas in the halo of quasar host galaxies are
investigated analyzing Mg II 2800 and C IV 1540 absorption-line systems along
the line of sight close to quasars. We used optical spectroscopy of closely
aligned pairs of quasars (projected dista... | astro-ph_GA |
The dimensionality of stellar chemical space using spectra from the
Apache Point Observatory Galactic Evolution Experiment: Chemical tagging of stars based on their similar compositions can offer new
insights about the star formation and dynamical history of the Milky Way. We
investigate the feasibility of identifyin... | astro-ph_GA |
The Astrochemical Impact of Cosmic Rays in Protoclusters I: Molecular
Cloud Chemistry: We present astrochemical photo-dissociation region models in which cosmic ray
attenuation has been fully coupled to the chemical evolution of the gas. We
model the astrochemical impact of cosmic rays, including those accelerated by... | astro-ph_GA |
Angular momentum evolution of bulge stars in disc galaxies in NIHAO: We study the origin of bulge stars and their angular momentum (AM) evolution
in 10 spiral galaxies with baryonic masses above $10^{10}$M$_\odot$ in the
NIHAO galaxy formation simulations. The simulated galaxies are in good
agreement with observations ... | astro-ph_GA |
Herschel-PACS spectroscopy of the intermediate mass protostar NGC7129
FIRS 2: Aims: We present preliminary results of the first Herschel spectroscopic
observations of NGC7129 FIRS2, an intermediate mass star-forming region. We
attempt to interpret the observations in the framework of an in-falling
spherical envelope.... | astro-ph_GA |
Star Cluster Classification using Deep Transfer Learning with PHANGS-HST: Currently available star cluster catalogues from HST imaging of nearby
galaxies heavily rely on visual inspection and classification of candidate
clusters. The time-consuming nature of this process has limited the production
of reliable catalogue... | astro-ph_GA |
Chemodynamical evolution of the Milky Way disk II: Variations with
Galactic radius and height above the disk plane: [Abridge] In the first paper of this series (paper I) we presented a new
approach for studying the chemo-odynamical evolution in disk galaxies, focusing
on the Milky Way. Here we extend these results to... | astro-ph_GA |
The SKA view of the Neutral Interstellar Medium in Galaxies: Two major questions in galaxy evolution are how star-formation on small
scales leads to global scaling laws and how galaxies acquire sufficient gas to
sustain their star formation rates. HI observations with high angular
resolution and with sensitivity to ver... | astro-ph_GA |
The Bizarre Chemical Inventory of NGC 2419, An Extreme Outer Halo
Globular Cluster: We present new Keck/HIRES observations of six red giants in the globular
cluster NGC 2419. Although the cluster is among the most distant and most
luminous in the Milky Way, it was considered chemically ordinary until very
recently. O... | astro-ph_GA |
Young stellar clusters in the Rosette molecular cloud. Arguments against
triggered star formation: The Rosette complex is a well studied region of the galactic plane which
presents the apparent characteristics of a triggered star forming region. This
is however still debated as no strong evidence corroborates this st... | astro-ph_GA |
Dwarf galaxy archaeology from chemical abundances and star formation
histories: We model the stellar abundances and ages of two disrupted dwarf galaxies in
the Milky Way stellar halo: Gaia-Sausage Enceladus (GSE) and Wukong/LMS-1.
Using a statistically robust likelihood function, we fit one-zone models of
galactic ch... | astro-ph_GA |
Comparison of the Orbital Properties of the Milky Way Globular Clusters
from the Data of the Gaia DR2 and EDR3 Catalogs: We provide new values of the orbital parameters of 152 globular clusters,
which are calculated using the new mean proper motions obtained from the Gaia
EDR3 catalog data. The orbits were integrated... | astro-ph_GA |
The Evolution Of The Faint End Of The UV Luminosity Function During The
Peak Epoch Of Star Formation (1<z<3): [Abridged] We present a robust measurement of the rest-frame UV luminosity
function (LF) and its evolution during the peak epoch of cosmic star formation
at 1<z<3. We use our deep near ultraviolet imaging fro... | astro-ph_GA |
Formation of galactic bulges from the cold gas filaments in
high-redshift dark matter halos: Formation process(es) of galactic bulges are not yet clarified although
several mechanisms have been proposed. In a previous study, we suggested one
possibility that galactic bulges have been formed from the cold gas inflowin... | astro-ph_GA |
Two distinct halo populations in the solar neighborhood. III. Evidence
from stellar ages and orbital parameters: In Papers I and II of this series, the existence of two distinct halo
populations of stars have been found in the solar neighborhood. Precise
relative ages and orbital parameters are determined for 67 halo... | astro-ph_GA |
Analyzing temporal variations of AGN emission line profiles in the
context of (dusty) cloud structure formation in the broad line region: The formation processes and the exact appearance of the dust torus and broad
line region (BLR) of active galactic nuclei (AGN) are under debate. Theoretical
studies show a possible... | astro-ph_GA |
Fast rotating and low-turbulence discs at $z\simeq 4.5$: Dynamical
evidence of their evolution into local early-type galaxies: Massive starburst galaxies in the early Universe are estimated to have
depletion times of $\sim 100$ Myr and thus be able to convert their gas very
quickly into stars, possibly leading to a r... | astro-ph_GA |
HST/WFC3 Observations of Low-Mass Globular Clusters AM 4 and Palomar 13:
Physical Properties and Implications for Mass Loss: We investigate the loss of low-mass stars in two of the faintest globular
clusters known, AM 4 and Palomar 13 (Pal 13), using HST/WFC3 F606W and F814W
photometry. To determine the physical prop... | astro-ph_GA |
A sensitive search for predicted methanol maser transitions with the
Australia Telescope Compact Array: We have used the Australia Telescope Compact Array (ATCA) to search for a
number of centimetre wavelength methanol transitions which are predicted to
show weak maser emission towards star formation regions. Sensiti... | astro-ph_GA |
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