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Photometry and Kinematics of Self-Gravitating Eccentric Nuclear Disks: The Andromeda Galaxy hosts an elongated nucleus with (at least) two distinct
brightness peaks. The double nucleus can be explained by the projection of a
thick, apsidally-aligned eccentric nuclear disk of stars in orbit about the
central black hole.... | astro-ph_GA |
Infrared Contributions of X-Ray Selected Active Galactic Nuclei in Dusty
Star-Forming Galaxies: We investigate the infrared contribution from supermassive black hole
activity versus host galaxy emission in the mid to far-infrared (IR) spectrum
for a large sample of X-ray bright active galactic nuclei (AGN) residing i... | astro-ph_GA |
Photoemission of spin-polarized electrons from aligned grains and chiral
symmetry breaking: The unique biosignature of life on Earth is the homochirality of organic
compounds such as amino acids, proteins, and sugars. The origin of this
homochirality has remained a mystery for over a century. While high-energy
spin-p... | astro-ph_GA |
Direct $N$-body simulations of globular clusters - II. Palomar 4: We use direct $N$-body calculations to study the evolution of the unusually
extended outer halo globular cluster Palomar 4 (Pal~4) over its entire lifetime
in order to reproduce its observed mass, half-light radius, velocity dispersion
and mass function ... | astro-ph_GA |
Profiling filaments: comparing near-infrared extinction and
submillimetre data in TMC-1: Interstellar filaments are an important part of star formation. To understand
the structure of filaments, cross-section profiles are often fitted with
Plummer profiles. This profiling is often done with submm studies, such as
Her... | astro-ph_GA |
A photometric and astrometric study of the open clusters NGC 1664 and
NGC 6939: This study calculated astrophysical parameters, as well as kinematic and
galactic orbital parameters, of the open clusters NGC 1664 and NGC 6939. The
work is based on CCD UBV and Gaia photometric and astrometric data from ground
and space... | astro-ph_GA |
COOL-LAMPS I. An Extraordinarily Bright Lensed Galaxy at Redshift 5.04: We report the discovery of COOL J1241+2219, a strongly-lensed galaxy at
redshift $z$=5.043$\pm$0.002 with observed magnitude $z_{AB}=20.47$, lensed by
a moderate-mass galaxy cluster at $z$=1.001$\pm$0.001. COOL J1241+2219 is the
brightest lensed ga... | astro-ph_GA |
Alignment of dense molecular core morphology and velocity gradients with
ambient magnetic fields: Studies of dense core morphologies and their orientations with respect to gas
flows and the local magnetic field have been limited to only a small sample of
cores with spectroscopic data. Leveraging the Green Bank Ammoni... | astro-ph_GA |
Variability-selected Active Galactic Nuclei in the VST-SUDARE/VOICE
Survey of the COSMOS Field: Optical variability has proven to be an effective way of detecting AGNs in
imaging surveys, lasting from weeks to years. In the present work we test its
use as a tool to identify AGNs in the VST multi-epoch survey of the C... | astro-ph_GA |
Gaseous Spiral Structure and Mass Drift in Spiral Galaxies: We use hydrodynamic simulations to investigate nonlinear gas responses to an
imposed stellar spiral potential in disk galaxies. The gaseous medium is
assumed to be infinitesimally thin, isothermal, and unmagnetized. We consider
various spiral-arm models with d... | astro-ph_GA |
Following the Cosmic Evolution of Pristine Gas II: The search for Pop
III-Bright Galaxies: Direct observational searches for Population III (Pop III) stars at high
redshift are faced with the question of how to select the most promising
targets for spectroscopic follow-up. To help answer this, we use a large-scale
co... | astro-ph_GA |
High-precision astrometry with VVV -- II. A near-infrared extension of
Gaia into the Galactic plane: Aims. We use near-infrared, ground-based data from the VISTA Variables in the
Via Lactea (VVV) survey to indirectly extend the astrometry provided by the
Gaia catalog to objects in heavily-extincted regions towards th... | astro-ph_GA |
What Makes Quadruply Lensed Quasars Quadruple?: Among known strongly lensed quasar systems, ~25% have gravitational
potentials sufficiently flat (and sources sufficiently well aligned) to produce
four images rather than two. The projected flattening of the lensing galaxy and
tides from neighboring galaxies both contrib... | astro-ph_GA |
Formation and Evolution of the Disk System of the Milky Way: [alpha/Fe]
Ratios and Kinematics of the SEGUE G-Dwarf Sample: We employ measurements of the [alpha/Fe] ratio derived from low-resolution
(R~2000) spectra of 17,277 G-type dwarfs from the SEGUE survey to separate them
into likely thin- and thick-disk subsamp... | astro-ph_GA |
HSCO$^+$ and DSCO$^+$: a multi-technique approach in the laboratory for
the spectroscopy of interstellar ions: Protonated molecular species have been proven to be abundant in the
interstellar gas. This class of molecules is also pivotal for the determination
of important physical parameters for the ISM evolution (e.g... | astro-ph_GA |
Photoinduced polycyclic aromatic hydrocarbon dehydrogenation: The
competition between H- and H2-loss: PAHs constitute a major component of the interstellar medium carbon budget,
locking up to 10--20% of the elemental carbon. Sequential fragmentation induced
by energetic photons leads to the formation of new species, ... | astro-ph_GA |
The local standard of rest and the well in the velocity distribution: It is now recognised that the traditional method of calculating the LSR
fails. We find an improved estimate of the LSR by making use of the larger and
more accurate database provided by XHIP and repeating our preferred analysis
from Francis & Anderso... | astro-ph_GA |
Environmental Quenching of Low Surface Brightness Galaxies near Milky
Way mass Hosts: Low Surface Brightness Galaxies (LSBGs) are excellent probes of quenching and
other environmental processes near massive galaxies. We study an extensive
sample of LSBGs near massive hosts in the local universe that are distributed
a... | astro-ph_GA |
Hot gas in massive halos drives both mass quenching and environment
quenching: Observations indicate that galaxies with high stellar masses or in dense
environments have low specific star formation rates, i.e. they are quenched.
Based on cosmological hydrodynamic simulations that include a prescription
where quenchin... | astro-ph_GA |
OH 18 cm Transition as a Thermometer for Molecular Clouds: We have observed the four hyperfine components of the 18 cm OH transition
toward the translucent cloud eastward of Heiles Cloud 2 (HCL2E), the cold dark
cloud L134N, and the photodissociation region of the $\rho$-Ophiuchi molecular
cloud with the Effelsberg 100... | astro-ph_GA |
A New Concept of Transonic Galactic Outflows in a Cold Dark Matter Halo
with a Central Super-Massive Black Hole: We study fundamental properties of isothermal, steady and spherically
symmetric galactic outflow in the gravitational potential of a cold dark matter
halo and a central super-massive black hole. We find th... | astro-ph_GA |
LBT/MODS spectroscopy of globular clusters in the irregular galaxy NGC
4449: We present intermediate-resolution (R$\sim$1000) spectra in the
$\sim$3500-10,000 A range of 14 globular clusters in the magellanic irregular
galaxy NGC 4449 acquired with the Multi Object Double Spectrograph on the Large
Binocular Telescope... | astro-ph_GA |
Stellar Over-densities in the Outer Halo of the Milky Way: This study presents a tomographic survey of a subset of the outer halo (10-40
kpc) drawn from the Sloan Digital Sky Survey Data Release 6. Halo substructure
on spatial scales of $>3$ degrees is revealed as an excess in the local density
of sub-giant stars. With... | astro-ph_GA |
An HI study of NGC 3521 - a galaxy with a slow-rotating halo: A study is presented of HI line observations of the nearby spiral galaxy NGC
3521 observed with the VLA as part of The HI Nearby Galaxy Survey. Clearly
evident in the HI data cube is the presence of an anomalous HI component that
is both diffuse and slow-rot... | astro-ph_GA |
SiO maser emission from red supergiants across the Galaxy: I. Targets in
massive star clusters: Aims. Red supergiants (RSGs) are among the most luminous of all stars, easily
detectable in external galaxies, and may ideally serve as kinematic tracers of
Galactic structure. Some RSGs are surrounded by circumstellar env... | astro-ph_GA |
Constraints on the Shape of the Milky Way Dark Matter Halo from Jeans
Equations Applied to SDSS Data: We search for evidence of dark matter in the Milky Way by utilizing the
stellar number density distribution and kinematics measured by the Sloan
Digital Sky Survey (SDSS) to heliocentric distances exceeding ~10 kpc. ... | astro-ph_GA |
One hundred SMUDGes in S-PLUS: ultra-diffuse galaxies flourish in the
field: We present the first systematic study of the stellar populations of
ultra-diffuse galaxies (UDGs) in the field, integrating the large area search
and characterization of UDGs by the SMUDGes survey with the twelve-band optical
photometry of t... | astro-ph_GA |
Distances to PHANGS Galaxies: New Tip of the Red Giant Branch
Measurements and Adopted Distances: PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies
within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other
multiwavelength data, the dataset will provide an unprecedented look ... | astro-ph_GA |
Nebular spectroscopy: A guide on H II regions and planetary nebulae: We present a tutorial on the determination of the physical conditions and
chemical abundances in gaseous nebulae. We also include a brief review of
recent results on the study of gaseous nebulae, their relevance for the study
of stellar evolution, gal... | astro-ph_GA |
The oldest stars of the bulge: new information on the ancient Galaxy: Recently the search for the oldest stars have started to focus on the Bulge
region. The Galactic bulge hosts extremely old stars, with ages compatible with
the ages of the oldest halo stars. The data coming from these recent
observations present new ... | astro-ph_GA |
Tidal Limit of Stellar Systems in Two-Power Density Models: As the generalization of gravitational effects on the point mass systems, we
want to study the tidal effect exerted on an extended stellar system using
spherical and axisymmetric elliptical models. Considering the Isochrone and
Plummer models for a passing ext... | astro-ph_GA |
Supernova enhanced cosmic ray ionization and induced chemistry in a
molecular cloud of W51C: Cosmic rays pervade the Galaxy and are thought to be accelerated in supernova
shocks. The interaction of cosmic rays with dense interstellar matter has two
important effects: 1) high energy (>1 GeV) protons produce {\gamma}-r... | astro-ph_GA |
Cosmic evolution of supermassive black holes: A view into the next two
decades: The discoveries made over the past 20 years by Chandra and XMM-Newton surveys
in conjunction with multiwavelength imaging and spectroscopic data available in
the same fields have significantly changed the view of the supermassive black
ho... | astro-ph_GA |
HST and Ground-Based Spectroscopy of Quasar Outflows: From Mini-BALs to
BALs: Quasar outflows have been posited as a mechanism to couple super-massive
black holes to evolution in their host galaxies. We use multi-epoch spectra
from the Hubble Space Telescope and ground-based observatories to study the
outflows in sev... | astro-ph_GA |
Cold gas in the early Universe. Survey for neutral atomic-carbon in GRB
host galaxies at 1 < z < 6 from optical afterglow spectroscopy: We present a survey for neutral atomic-carbon (CI) along gamma-ray burst
(GRB) sightlines, which probes the shielded neutral gas-phase in the
interstellar medium (ISM) of GRB host ga... | astro-ph_GA |
MCMC-based Voigt Profile fitting to a Mini-BAL System in the Quasar
UM675: We introduce a Bayesian approach coupled with a Markov Chain Monte Carlo
(MCMC) method and the maximum likelihood statistic for fitting the profiles of
narrow absorption lines (NALs) in quasar spectra. This method also incorporates
overlap bet... | astro-ph_GA |
History of the gas fuelling star formation in eagle galaxies: Theory predicts that cosmological gas accretion plays a fundamental role
fuelling star formation in galaxies. However, a detailed description of the
accretion process to be used when interpreting observations is still lacking.
Using the state-of-the-art cosm... | astro-ph_GA |
Witnessing a Galaxy Cluster Merger with JWST and a Chandra X-ray
Temperature Map: The first James Webb Space Telescope (JWST) image released was of galaxy
cluster SMACSJ0723.3- 7327, a lensing cluster at z=0.39 showing detail only
JWST can provide. While the majority of the focus has been on the brilliantly
lensed ga... | astro-ph_GA |
LoCuSS: Exploring the selection of faint blue background galaxies for
cluster weak-lensing: Cosmological constraints from galaxy clusters rely on accurate measurements
of the mass and internal structure of clusters. An important source of
systematic uncertainty in cluster mass and structure measurements is the secure... | astro-ph_GA |
Cold galaxies: We use 350 mu angular diameter estimates from Planck to test the idea that
some galaxies contain exceptionally cold (10-13 K) dust, since colder dust
implies a lower surface brightness radiation field illuminating the dust, and
hence a greater physical extent for a given luminosity. The galaxies identifi... | astro-ph_GA |
Potential Importance of Binary Evolution in UV-Optical Spectral Fitting
of Early-Type Galaxies: Binaries are very common in galaxies, and more than half of Galactic hot
subdwarf stars, which are thought as a possible origin of UV-upturn of old
stellar populations, are found in binaries. Previous works showed that bin... | astro-ph_GA |
The Far-Infrared-Radio Correlation in MS0451-03: We present a multi-wavelength analysis of star-forming galaxies in the
massive cluster MS0451.6-0305 at z $\sim$ 0.54 to shed new light on the
evolution of the far-infrared-radio relationship in distant rich clusters. We
have derived total infrared luminosities for a spe... | astro-ph_GA |
Extremely metal-poor galaxies with HST/COS: laboratories for models of
low-metallicity massive stars and high-redshift galaxies: Ultraviolet (UV) observations of local star-forming galaxies have begun to
establish an empirical baseline for interpreting the rest-UV spectra of
reionization-era galaxies. However, existi... | astro-ph_GA |
Generating Images of the M87* Black Hole Using GANs: In this paper, we introduce a novel data augmentation methodology based on
Conditional Progressive Generative Adversarial Networks (CPGAN) to generate
diverse black hole (BH) images, accounting for variations in spin and electron
temperature prescriptions. These gene... | astro-ph_GA |
CARMA CO Observations of Three Extremely Metal-Poor, Star-Forming
Galaxies: We present sensitive CO (J = 1 - 0) emission line observations of three
metal-poor dwarf irregular galaxies Leo P (Z ~ 3% Z_Solar), Sextans A (Z ~ 7.5%
Z_Solar), and Sextans B (Z ~ 7.5% Z_Solar), all obtained with the Combined
Array for Milli... | astro-ph_GA |
Globular clusters in the stellar stream surrounding the Milky Way analog
NGC 5907: We study the globular clusters (GCs) in the spiral galaxy NGC~5907 well-known
for its spectacular stellar stream -- to better understand its origin. Using
wide-field Subaru/Suprime-Cam $gri$ images and deep Keck/DEIMOS multi-object
spe... | astro-ph_GA |
Two-component outer ring and the Galactic spiral structure: Model of the Galaxy with the ring R1R2' can explain some large-scale
morphological features of the Galactic spiral structure. The Carina-Sagittarius
arm can consist of two ascending segments of the outer rings R1 and R2 which
almost touch each other near the C... | astro-ph_GA |
The structure of molecular gas associated with NGC2264: wide-field 12CO
and H2 imaging: We present wide-field, high-resolution imaging observations in 12CO 3-2 and
H2 1-0 S(1) towards a ~1 square degree region of NGC2264. We identify 46 H2
emission objects, of which 35 are new discoveries. We characterize several
cor... | astro-ph_GA |
Dynamic role of dust in formation of molecular clouds: Dust is the usual minor component of the interstellar medium. Its dynamic
role in the contraction of the diffuse gas into molecular clouds is commonly
assumed to be negligible because of the small mass fraction, $f \simeq 0.01$.
However, as shown in this study, the... | astro-ph_GA |
A New Challenge for Dark Matter Models: Cold dark matter (CDM) has faced a number of challenges mainly at small
scales, such as the too-big-to-fail problem, and core-cusp density profile of
dwarf galaxies. Such problems were argued to have a solution either in the
baryonic physics sector or in modifying the nature of d... | astro-ph_GA |
Infrared appearance of wind-blown bubbles around young massive stars: Thousands of ring-like bubbles appear on infrared images of the Galaxy plane.
Most of these infrared bubbles form during expansion of HII regions around
massive stars. However, the physical effects that determine their morphology
are still under deba... | astro-ph_GA |
A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ~ 12 Galaxy in
Early JWST CEERS Imaging: We report the discovery of a candidate galaxy with a photo-z of z~12 in the
first epoch of the JWST Cosmic Evolution Early Release Science (CEERS) Survey.
Following conservative selection criteria we identify a source wi... | astro-ph_GA |
Ultra-diffuse galaxies: the high-spin tail of the abundant dwarf galaxy
population: Recent observations have revealed the existence of an abundant population of
faint, low surface brightness (SB) galaxies, which appear to be numerous and
ubiquitous in nearby galaxy clusters, including the Virgo, Coma and Fornax
clust... | astro-ph_GA |
The Physical Properties of Galaxies with Unusually Red Mid-Infrared
Colours: The goal of this paper is to investigate the physical nature of galaxies in
the redshift range $0.02<z<0.15$ that have strong excess emission at mid-IR
wavelengths and to determine whether they host a population of accreting black
holes that... | astro-ph_GA |
Peering into the Milky Way by FAST: I. Exquisite HI structures in the
inner Galactic disk from the piggyback line observations of the FAST GPPS
survey: Neutral hydrogen (HI) is the fundamental component of the interstellar
medium. The Galactic Plane Pulsar Snapshot (GPPS) survey is designed for
hunting pulsars by u... | astro-ph_GA |
X-ray properties of two complementary samples of intermediate Seyfert
galaxies: We present the X-ray spectral analysis of two complementary sets of
intermediate Seyfert galaxies (ISs). Analyzing X-ray data, we estimate the
hydrogen abundance $N_H$ and test its connection with the [O III] luminosity
acquired from opti... | astro-ph_GA |
Disentangling star formation and AGN activity in powerful infrared
luminous radio galaxies at 1<z<4: High-redshift radio galaxies present signs of both star formation and AGN
activity, making them ideal candidates to investigate the connection and
coevolution of AGN and star formation in the progenitors of present-da... | astro-ph_GA |
Supermassive black hole pairs in clumpy galaxies at high redshift:
delayed binary formation and concurrent mass growth: Massive gas-rich galaxy discs at $z \sim 1-3$ host massive star-forming
clumps with typical baryonic masses in the range $10^7-10^8$~M$_{\odot}$ which
can affect the orbital decay and concurrent gro... | astro-ph_GA |
The PAU Survey: Classifying low-z SEDs using Machine Learning clustering: We present an application of unsupervised Machine Learning Clustering to the
PAU Survey of galaxy spectral energy distribution (SED) within the COSMOS
field. The clustering algorithm is implemented and optimized to get the
relevant groups in the ... | astro-ph_GA |
Stellar Populations With Optical Spectra: Deep Learning vs. Popular
Spectrum Fitting Codes: We compare the performance of several popular spectrum fitting codes
(Firefly, starlight, pyPipe3D and pPXF), and a deep-learning convolutional
neural network (StarNet), in recovering known stellar population properties
(mean ... | astro-ph_GA |
Testing broad line region models with Reverberation Mapping: New reverberation mapping (RM) measurements, combined with accurate
luminosities and line ratios, provide strong constraints on the location of the
line emitting gas in the broad line region (BLR) of active galactic nuclei
(AGN). In this paper I present new c... | astro-ph_GA |
First HETDEX Spectroscopic Determinations of Ly$α$ and UV
Luminosity Functions at $z=2-3$: Bridging a Gap Between Faint AGN and Bright
Galaxies: We present Ly$\alpha$ and ultraviolet-continuum (UV) luminosity functions
(LFs) of galaxies and active galactic nuclei (AGN) at $z=2.0-3.5$ determined by
the un-targetted ... | astro-ph_GA |
Stratified Distribution of Organic Molecules at the Planet-Formation
Scale in the HH 212 Disk Atmosphere: Formamide (NH2CHO) is considered an important prebiotic molecule because of
its potential to form peptide bonds. It was recently detected in the atmosphere
of the HH 212 protostellar disk on the Solar-System scal... | astro-ph_GA |
On the Virialization of Disk Winds: Implications for the Black Hole Mass
Estimates in AGN: Estimating the mass of a supermassive black hole (SMBH) in an active galactic
nucleus (AGN) usually relies on the assumption that the broad line region (BLR)
is virialized. However, this assumption seems invalid in BLR models t... | astro-ph_GA |
The ALPINE-ALMA [CII] Survey: Multi-Wavelength Ancillary Data and Basic
Physical Measurements: We present the ancillary data and basic physical measurements for the
galaxies in the ALMA Large Program to Investigate C+ at Early Times (ALPINE)
survey - the first large multi-wavelength survey which aims at characterizin... | astro-ph_GA |
A Deep Chandra ACIS Survey of M83: We have obtained a series of deep X-ray images of the nearby galaxy M83 using
Chandra, with a total exposure of 729 ks. Combining the new data with earlier
archival observations totaling 61 ks, we find 378 point sources within the D25
contour of the galaxy. We find 80 more sources, mo... | astro-ph_GA |
Fundamental plane of elliptical galaxies in $f(R)$ gravity: the role of
luminosity: The global properties of elliptical galaxies are connected through the
so-called fundamental plane of ellipticals, which is an empirical relation
between their parameters: effective radius, central velocity dispersion and
mean surface... | astro-ph_GA |
Photodissociation Region Diagnostics Across Galactic Environments: We present three-dimensional astrochemical simulations and synthetic
observations of magnetised, turbulent, self-gravitating molecular clouds. We
explore various galactic interstellar medium environments, including cosmic-ray
ionization rates in the ran... | astro-ph_GA |
The fate of the pre-main sequence-rich clusters Collinder197 and vdB92:
dissolution?: We investigate the nature and possible evolution of the young Galactic star
clusters Collinder 197 (Cr 197) and vdB 92. The colour-magnitude diagrams
(CMDs) are basically characterised by a poorly-populated MS and a dominant
fractio... | astro-ph_GA |
PROBES-I: A Compendium of Deep Rotation Curves and Matched multiband
Photometry: We present the Photometry and Rotation Curve Observations from Extragalactic
Surveys (PROBES) compendium of extended rotation curves for 3163 late-type
spirals, with matching homogeneous multiband photometry for 1677 of them.
PROBES rota... | astro-ph_GA |
Spiral Structure in Scale-free, Thin Discs: Rigid Rotation: In this paper we suggest the existence in the central regions of spiral
galaxies of collisionless, scale-free, rigidly rotating, self-gravitating discs
with spiral symmetry. Such discs must be truncated at a finite radius, and they
must be stabilized and rende... | astro-ph_GA |
Lagrangian statistics of a shock-driven turbulent dynamo in decaying
turbulence: Small-scale fluctuating magnetic fields of order $n$G are observed in
supernova shocks and galaxy clusters, where its amplification is likely caused
by the Biermann battery mechanism. However, these fields cannot be amplified
further wit... | astro-ph_GA |
On the Dispersal of Young Stellar Hierarchies: Hierarchical structure in young star fields has been demonstrated in a
variety of ways, including two point correlation functions (TPCFs) that are
power laws for spatial scales up to at least several hundred parsecs. As the
stars age, this power law decreases in slope unti... | astro-ph_GA |
Robust statistical tools for identifying multiple stellar populations in
globular clusters in the presence of measurement errors. A case study: NGC
2808: The finding of multiple stellar populations (MP), defined by patterns in the
stellar element abundances, is nowadays considered a distinctive feature of
globular ... | astro-ph_GA |
ALMA sub-/millimeter sources among $Spitzer$ SMUVS galaxies at $z>2$ in
the COSMOS field: Sub-millimeter observations reveal the star-formation activity obscured by
dust in the young Universe. It still remains unclear how galaxies detected at
sub-millimeter wavelengths are related to ultraviolet/optical-selected gala... | astro-ph_GA |
Simulated Galaxy Interactions as Probes of Merger Spectral Energy
Distributions: We present the first systematic comparison of ultraviolet-millimeter spectral
energy distributions (SEDs) of observed and simulated interacting galaxies. Our
sample is drawn from the Spitzer Interacting Galaxy Survey, and probes a range
... | astro-ph_GA |
EVN observations of 6.7 GHz methanol maser polarization in massive
star-forming regions. V. Completion of the flux-limited sample: Although the role of magnetic fields in launching molecular outflows in
massive YSOs has been convincingly demonstrated by theoretical arguments,
observationally, the alignment of the mag... | astro-ph_GA |
A rogues gallery of Andromeda's dwarf galaxies II. Precise Distances to
17 Faint Satellites: We present new horizontal branch (HB) distance measurements to 17 of the
faintest known M31 satellites ($-6 \lesssim M_{V} \lesssim -13$) based on deep
Hubble Space Telescope (HST) imaging. The color-magnitude diagrams extend... | astro-ph_GA |
Analysing surveys of our Galaxy I: basic astrometric data: We consider what is the best way to extract science from large surveys of the
Milky Way galaxy. The diversity of data gathered in these surveys, together
with our position within the Galaxy, imply that science must be extracted by
fitting dynamical models to th... | astro-ph_GA |
Age bimodality in the central region of pseudobulges in S0 galaxies: We present evidence for bimodal stellar age distribution of pseudobulges of
S0 galaxies as probed by the $D_n(4000)$ index. We do not observe any
bimodality in age distribution for pseudobulges in spiral galaxies. Our sample
is flux limited and contai... | astro-ph_GA |
Chemical abundances of giant stars in the Crater stellar system: We obtained spectra for two giants of Crater (Crater J113613-105227 and
Crater J113615-105244) using X-Shooter at the VLT. The spectra have been
analysed with the MyGIsFoS code using a grid of synthetic spectra computed from
one dimensional, Local Thermod... | astro-ph_GA |
Long period variable stars in NGC 147 and NGC 185. I. Their star
formation histories: NGC 147 and NGC 185 are two of the most massive satellites of the Andromeda
galaxy (M 31). Close together in the sky, of similar mass and morphological
type dE, they possess different amounts of interstellar gas and tidal
distortion... | astro-ph_GA |
Redshift and stellar mass dependence of intrinsic shapes of
disc-dominated galaxies from COSMOS observations below $z = 1.0$: The high abundance of disc galaxies without a large central bulge challenges
predictions of current hydrodynamic simulations of galaxy formation. We aim to
shed light on the formation of these... | astro-ph_GA |
Molecular cloud determination in the Northern Galactic Plane: The Exeter FCRAO CO Galactic Plane Survey consists of 12CO and 13CO (J=1-0)
observations over the galactic plane covering 55 degrees <= l <= 102 degrees,
|b| >= 1 degree and 141 degrees <= l <= 195 degrees, -3.5 degrees <= b <= 5.5
degrees with a spatial res... | astro-ph_GA |
Extremely Low Molecular Gas Content in the Vicinity of a Red Nugget
Galaxy at $z=1.91$: We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 5
observations of a galaxy at $z=1.91$, GDS24569, in search of molecular gas in
its vicinity via the [C I] $^3$P$_1$-$^3$P$_0$ line. GDS24569 is a massive
($\log ... | astro-ph_GA |
Dust Reverberation Mapping of Z229-15: We report results of the dust reverberation mapping (DRM) on the Seyfert 1
galaxy Z229-15 at z = 0.0273. Quasi-simultaneous photometric observations for a
total of 48 epochs were acquired during the period 2017 July to 2018 December
in B, V, J, H and Ks bands. The calculated spect... | astro-ph_GA |
The formation and evolution of Andromeda IX: Local Group (LG), the nearest and most complete galactic environment,
provides valuable information on the formation and evolution of the Universe.
Studying galaxies of different sizes, morphologies, and ages can provide this
information. For this purpose, we chose the And\,... | astro-ph_GA |
The Si+SO$_2$ collision and an extended network of neutral-neutral
reactions between silicon and sulphur bearing species: The Si+SO$_2$ reaction is investigated to verify its impact on the abundances
of molecules with astrochemical interest, such as SiS, SiO, SO and others.
According to our results Si($^3$P) and SO$_... | astro-ph_GA |
The SSA22 HI Tomography Survey (SSA22-HIT). I. Data Set and Compiled
Redshift Catalog: We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field
with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope,
designed to tomographically map high-z HI gas through analysis of Lya
abso... | astro-ph_GA |
A Census of Protostellar Outflows in Nearby Molecular Clouds: We adopt the deep learning method CASI-3D (Convolutional Approach to
Structure Identification-3D) to systemically identify protostellar outflows in
12CO and 13CO observations of the nearby molecular clouds, Ophiuchus, Taurus,
Perseus and Orion. The total out... | astro-ph_GA |
ALMA-IMF. V. Prestellar and protostellar core populations in the W43
cloud complex: The origin of the stellar initial mass function (IMF) and its relation with
the core mass function (CMF) are actively debated issues with important
implications in astrophysics. Recent observations in the W43 molecular complex
of top-... | astro-ph_GA |
The Evolution of Magellanic-like Galaxy Pairs and The Production of
Magellanic Stream Analogues in Simulations with Tides, Ram Pressure, and
Stellar Feedback: We present a series of chemodynamical simulations of Magellanic-like systems
consisting of two interacting, equal-mass dwarf galaxies orbiting a massive
host... | astro-ph_GA |
Surface Brightness Evolution of Galaxies in the CANDELS GOODS Fields up
to $z \sim 6$: High-z Galaxies are Unique or Remain Undetected: We investigate the rest-frame Ultraviolet (UV, $\lambda\sim2000$\AA) surface
brightness (SB) evolution of galaxies up to $z\sim6$ using a variety of deep
Hubble Space Telescope imagi... | astro-ph_GA |
Stellar Mass Black Holes in Young Galaxies: We explore the potential cumulative energy production of stellar mass black
holes in early galaxies. Stellar mass black holes may accrete substantially
from the higher density interstellar media of primordial galaxies, and their
energy release would be distributed more unifor... | astro-ph_GA |
What determines the formation and characteristics of protoplanetary
discs?: Planets form in protoplanetary discs. Their masses, distribution, and orbits
sensitively depend on the structure of the protoplanetary discs. However, what
sets the initial structure of the discs in terms of mass, radius and accretion
rate is... | astro-ph_GA |
New Optical Reddening Maps of the Large and Small Magellanic Clouds: We present new reddening maps of the SMC and LMC based on the data of the
third phase of the Optical Gravitational Lensing Experiment (OGLE III). We have
used two different methods to derive optical reddening maps. We adopt a
theoretical mean unredden... | astro-ph_GA |
Constraining the physical properties of the first lensed $z\sim10-16$
galaxy candidates with JWST: The first deep-field observations of the JWST have immediately yielded a
surprisingly large number of very high redshift candidates, pushing the
frontier of observability well beyond $z\gtrsim10$. We here present a deta... | astro-ph_GA |
Spectroscopic investigation of a reionized galaxy overdensity at z=7: We present deep spectroscopic follow-up observations of the Bremer Deep Field
(BDF) where the two $z\sim$7 bright Ly$\alpha$ emitters (LAE) BDF521 and
BDF3299 were previously discovered by Vanzella et al. (2011) and where a factor
of $\sim$3-4 overde... | astro-ph_GA |
The Stellar-to-Halo Mass Ratios of Passive and Star-Forming Galaxies at
z~2-3 from the SMUVS survey: In this work, we use measurements of galaxy stellar mass and two-point
angular correlation functions to constrain the stellar-to-halo mass ratios
(SHMRs) of passive and \np\ galaxies at $z\sim2-3$, as identified in th... | astro-ph_GA |
Modelling the CO streamers in the explosive ejection of Orion BN/KL
region: We present reactive gasdynamic, axisymmetric simulations of dense, high
velocity clumps for modelling the CO streamers observed in Orion BN/KL. We have
considered 15 chemical species, a cooling function for atomic and molecular
gas, and heati... | astro-ph_GA |
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