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Recognizing Blazars Using Radio Morphology from the VLA Sky Survey: Blazars are radio-loud Active Galactic Nuclei (AGN) whose jets have a very
small angle to our line of sight. Observationally, the radio emission are
mostly compact or a compact-core with a 1-sided jet. With 2.5$^{\prime\prime}$
resolution at 3 GHz, the... | astro-ph_GA |
Probing the initial conditions of high-mass star formation -- IV. Gas
dynamics and NH$_2$D chemistry in high-mass precluster and protocluster
clumps: The initial stage of star formation is a complex area study because of its
high density and low temperature. Under such conditions, many molecules become
depleted fro... | astro-ph_GA |
The numbers of z~2 star-forming and passive galaxies in 2.5 square
degrees of deep CFHT imaging: We use an adaptation of the BzKs technique to select ~40,000 z~2 galaxies (to
K(AB) = 24), including ~5,000 passively evolving (PE) objects (to K(AB) = 23),
from 2.5 deg^2 of deep CFTH imaging. The passive galaxy luminosi... | astro-ph_GA |
The dragonfly nearby galaxies survey. Iv. A giant stellar disk in ngc
2841: Neutral gas is commonly believed to dominate over stars in the outskirts of
galaxies, and investigations of the disk-halo interface are generally
considered to be in the domain of radio astronomy. This may simply be a
consequence of the fact ... | astro-ph_GA |
Toward an Empirical Theory of Pulsar Emission. X. On the Precursor and
Postcursor Emission: Precursors and postcursors (PPCs) are rare emission components detected in a
handful of pulsars that appear beyond the main pulse emission, in some cases
far away from it. In this paper we attempt to characterize the PPC emiss... | astro-ph_GA |
ALMA unveils a triple merger and gas exchange in a hyper-luminous radio
galaxy at z=2: the Dragonfly Galaxy (II): The Dragonfly Galaxy (MRC0152-209), at redshift z~2, is one of the most
vigorously star-forming radio galaxies in the Universe. What triggered its
activity? We present ALMA Cycle 2 observations of cold mo... | astro-ph_GA |
ATLASGAL --- properties of compact HII regions and their natal clumps: We present a complete sample of molecular clumps containing compact and
ultra-compact (UC) HII regions between \ell=10\degr and 60\degr\ and
$|b|<1\degr, identified by combining the the ATLASGAL submm and CORNISH radio
continuum surveys with visual ... | astro-ph_GA |
A phase-space view of cold-gas properties of Virgo-cluster galaxies:
multiple quenching processes at work?: We investigate the cold-gas properties of massive Virgo galaxies ($>10^9$
M$_\odot$) at $<3R_{200}$ ($R_{200}$ is the radius where the mean interior
density is 200 times the critical density) on the projected p... | astro-ph_GA |
Unresolved z~8 point sources and their impact on the bright end of the
galaxy luminosity function: The distribution and properties of the first galaxies and quasars are
critical pieces of the puzzle in understanding galaxy evolution and cosmic
reionization. Previous studies have often excluded unresolved sources as
p... | astro-ph_GA |
Better Together: The Complex Interplay Between Radiative Cooling and
Magnetic Draping: Rapidly outflowing cold H-I gas is ubiquitously observed to be co-spatial
with a hot phase in galactic winds, yet the ablation time of cold gas by the
hot phase should be much shorter than the acceleration time. Previous work
showe... | astro-ph_GA |
Variations of the initial mass function in semi-analytical models:
implications for the mass assembly and the chemical enrichment of galaxies in
the GAEA model: In this work, we investigate the implications of the Integrated Galaxy-wide
stellar Initial Mass Function (IGIMF) approach in the framework of the
semi-ana... | astro-ph_GA |
How does star formation proceed in the circumnuclear starburst ring of
NGC 6951?: Gas inflowing along stellar bars is often stalled at the location of
circumnuclear rings, that form an effective reservoir for massive star
formation and thus shape the central regions of galaxies. However, how exactly
star formation is... | astro-ph_GA |
Galactic Chemical Evolution and the Oxygen Isotopic Composition of the
Solar System: We review current observational and theoretical constraints on the Galactic
chemical evolution (GCE) of oxygen isotopes in order to explore whether GCE
plays a role in explaining the lower 17O/18O ratio of the Sun, relative to the
pr... | astro-ph_GA |
Confirmation and refutation of very luminous galaxies in the early
universe: During the first 500 million years of cosmic history, the first stars and
galaxies formed, seeding the Universe with heavy elements and eventually
reionizing the intergalactic medium. Observations with JWST have uncovered a
surprisingly high... | astro-ph_GA |
Spatially-resolved spectroscopy of narrow-line Seyfert 1 host galaxies: We present optical integral field spectroscopy for five $z<0.062$ narrow-line
Seyfert 1 galaxies (NLS1s) host galaxies, probing their host galaxies at
$\gtrsim 2-3$ kpc scales. Emission lines in the nuclear AGN spectra and the
large-scale host gala... | astro-ph_GA |
An infrared view of AGN feedback in a type-2 quasar: the case of the
Teacup galaxy: We present near-infrared integral field spectroscopy data obtained with
VLT/SINFONI of "the Teacup galaxy". The nuclear K-band (1.95-2.45 micron)
spectrum of this radio-quiet type-2 quasar reveals a blueshifted broad
component of FWHM... | astro-ph_GA |
Chemical Evolution of R-process Elements in Stars (CERES). I. Stellar
parameters and chemical abundances from Na to Zr: Aims. The Chemical Evolution of R-process Elements in Stars (CERES) project
aims to provide a homogeneous analysis of a sample of metal-poor stars
([Fe/H]<-1.5). We present the stellar parameters an... | astro-ph_GA |
Spectral scaling laws in MHD turbulence simulations and in the solar
wind: The question is addressed to what extent incompressible magnetohydrodynamics
(MHD) can describe random magnetic and velocity fluctuations measured in the
solar wind. It is demonstrated that distributions of spectral indices for the
velocity, m... | astro-ph_GA |
An uncertainty principle for star formation -- III. The characteristic
emission time-scales of star formation rate tracers: We recently presented a new statistical method to constrain the physics of
star formation and feedback on the cloud scale by reconstructing the underlying
evolutionary timeline. However, by itse... | astro-ph_GA |
WALLABY Early Science - III. An HI Study of the Spiral Galaxy NGC 1566: This paper reports on the atomic hydrogen gas (HI) observations of the spiral
galaxy NGC 1566 using the newly commissioned Australian Square Kilometre Array
Pathfinder (ASKAP) radio telescope. We measure an integrated HI flux density of
$180.2$ Jy ... | astro-ph_GA |
Red Clump stars from LAMOST II: the outer disc of the Milky Way: We present stellar density maps of the Galactic outer disc with red clump
stars from the LAMOST data. These samples are separated into younger (mean age
~ 2.7 Gyr) and older (mean age ~ 4.6 Gyr) populations so that they can trace
the variation of the stru... | astro-ph_GA |
A comparison of the distribution of satellite galaxies around Andromeda
and the results of $Λ$CDM simulations: Ibata et al. (2013) recently reported the existence of a vast thin plane of
dwarf galaxies (VTPD) orbiting around Andromeda. We investigate whether such a
configuration can be reproduced within the standard ... | astro-ph_GA |
High velocity stars from the interaction of a globular cluster and a
massive black hole binary: High velocity stars are stars moving at velocities so high to require an
acceleration mechanism involving binary systems or the presence of a massive
central black hole. In the frame of a galaxy hosting a supermassive blac... | astro-ph_GA |
The Optical to Mid-Infrared Extinction Law Based on the APOGEE, Gaia
DR2, Pan-STARRS1, SDSS, APASS, 2MASS and WISE Surveys: A precise interstellar dust extinction law is critically important to
interpret observations. There are two indicators of extinction: the color
excess ratio (CER) and the relative extinction. Co... | astro-ph_GA |
Dark Matter In Disk Galaxies II: Density Profiles as Constraints on
Feedback Scenarios: The disparity between the density profiles of galactic dark matter haloes
predicted by dark matter only cosmological simulations and those inferred from
rotation curve decomposition, the so-called cusp-core problem, suggests that
... | astro-ph_GA |
Gaia FGK Benchmark Stars - Metallicity: To calibrate automatic pipelines that determine atmospheric parameters of
stars, one needs a sample of stars -- ``benchmark stars'' -- with well defined
parameters to be used as a reference We provide a detailed documentation of the
determination of the iron abundance of the 34 F... | astro-ph_GA |
A Bayesian Approach to the Vertical Structure of the Disk of the Milky
Way: This work investigates the vertical profile of the stars in the disk of the
Milky Way. The models investigated are of the form $sech^{2/n}(nz/(2H))$ where,
setting $\alpha = 2/n$, the three functions of the sequence $\alpha = 0,1,2$
correspon... | astro-ph_GA |
Denoising Diffusion Probabilistic Models to Predict the Density of
Molecular Clouds: We introduce the state-of-the-art deep learning Denoising Diffusion
Probabilistic Model (DDPM) as a method to infer the volume or number density of
giant molecular clouds (GMCs) from projected mass surface density maps. We
adopt magn... | astro-ph_GA |
Resolved Star Formation on Sub-galactic Scales in a Merger at z=1.7: We present a detailed analysis of Hubble Space Telescope (HST), Wide Field
Camera 3 (WFC3) G141 grism spectroscopy for seven star-forming regions of the
highly magnified lensed starburst galaxy RCSGA 032727-132609 at z=1.704. We
measure the spatial va... | 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 |
Searching for new observational signatures of the dynamical evolution of
star clusters: We present a numerical study, based on Monte Carlo simulations, aimed at
defining new empirical parameters measurable from observations and able to
trace the different phases of star cluster dynamical evolution. As expected, a
cen... | astro-ph_GA |
N-body simulations of the Carina dSph in MOND: The classical dwarf spheroidals (dSphs) provide a critical test for Modified
Newtonian Dynamics (MOND) because they are observable satellite galactic
systems with low internal accelerations and low, but periodically varying,
external acceleration. This varying external gra... | astro-ph_GA |
High-velocity stars in the cores of globular clusters: The illustrative
case of NGC 2808: We report the detection of five high-velocity stars in the core of the
globular cluster NGC 2808. The stars lie on the the red giant branch and show
total velocities between 40 and 45 km/s. For a core velocity dispersion sigma_c... | astro-ph_GA |
Tracing the Milky Way Nuclear Wind with 21cm Atomic Hydrogen Emission: There is evidence in 21cm HI emission for voids several kpc in size centered
approximately on the Galactic centre, both above and below the Galactic plane.
These appear to map the boundaries of the Galactic nuclear wind. An analysis of
HI at the tan... | astro-ph_GA |
The formation of the Milky Way halo and its dwarf satellites: a NLTE-1D
abundance analysis. IV. Segue 1, Triangulum II, and Coma Berenices UFDs: We present atmospheric parameters and abundances for chemical elements from
carbon to barium in metal-poor stars in Segue 1 (seven stars), Coma Berenices
(three stars), and ... | astro-ph_GA |
Radio Imaging of the NGC 2024 FIR 5/6 Region: a Hypercompact H II Region
Candidate in Orion: The NGC 2024 FIR 5/6 region was observed in the 6.9 mm continuum with an
angular resolution of about 1.5 arcsec. The 6.9 mm continuum map shows four
compact sources, FIR 5w, 5e, 6c, and 6n, as well as an extended structure of... | astro-ph_GA |
Properties of dense molecular gas along the major axis of M 82: Dense gas is important for galaxy evolution and star formation.
Optically-thin dense-gas tracers, such as isotopologues of HCN, HCO+, etc., are
very helpful to diagnose excitation conditions of dense molecular gas. However,
previous studies of optically-th... | astro-ph_GA |
VINTERGATAN III: how to reset the metallicity of the Milky Way: Using the cosmological zoom simulation VINTERGATAN, we present a new scenario
for the onset of star formation at the metal-poor end of the low-[$\alpha$/Fe]
sequence in a Milky Way-like galaxy. In this scenario, the galaxy is fueled by
two distinct gas flo... | astro-ph_GA |
Effects of radial flows on the chemical evolution of the Milky Way disk: The majority of chemical evolution models assume that the Galactic disk forms
by means of infall of gas and divide the disk into several independent rings
without exchange of matter between them. However, if gas infall is important,
radial gas flo... | astro-ph_GA |
Galactic disk winds driven by cosmic ray pressure: Cosmic ray pressure gradients transfer energy and momentum to extraplanar gas
in disk galaxies, potentially driving significant mass loss as galactic winds.
This may be particularly important for launching high-velocity outflows of
"cool" (T < 10^4 K) gas. We study cos... | astro-ph_GA |
VERA astrometry toward the Perseus arm gap: The Perseus arm has a gap in Galactic longitudes (l) between 50 and 80 deg
(hereafter the Perseus arm gap) where the arm has little star formation
activity. To better understand the gap, we conducted astrometric observations
with VERA and analyzed archival H I data. We report... | astro-ph_GA |
Universes without the Weak Force: Astrophysical Processes with Stable
Neutrons: We investigate a class of universes in which the weak interaction is not in
operation. We consider how astrophysical processes are altered in the absence
of weak forces, including Big Bang Nucleosynthesis (BBN), galaxy formation,
molecula... | astro-ph_GA |
Star Formation in CALIFA survey perturbed galaxies. I. Effects of Tidal
Interactions: We explore the effects of tidal interactions on star formation (SF) by
analysing a sample of CALIFA survey galaxies. The sample consists of tidally
and non-tidally perturbed galaxies, paired at the closest stellar mass
densities for... | astro-ph_GA |
Tracing the general structure of Galactic molecular clouds using Planck
data: I. The Perseus region as a test case: We present an analysis of probability distribution functions (pdfs) of column
density in different zones of the star-forming region Perseus and its diffuse
environment based on the map of dust opacity a... | astro-ph_GA |
Galactic planetary nebulae in the AKARI far-infrared surveyor bright
source catalog: We present the results of our preliminary study of all known Galactic PNe
(included in the Kerber 2003 catalog) which are detected by the AKARI/FIS
All-Sky Survey as identified in the AKARI/FIS Bright Source Catalog (BSC)
Version Bet... | astro-ph_GA |
Predicting the hypervelocity star population in Gaia: Hypervelocity stars (HVSs) are amongst the fastest objects in our Milky Way.
These stars are predicted to come from the Galactic center (GC) and travel
along unbound orbits across the Galaxy. In the coming years, the ESA satellite
Gaia will provide the most complete... | astro-ph_GA |
The Faint Satellite System of NGC 253: Insights into Low-Density
Environments and No Satellite Plane: We have conducted a systematic search around the Milky Way (MW) analog NGC
253 (D=3.5 Mpc), as a part of the Panoramic Imaging Survey of Centaurus and
Sculptor (PISCeS) - a Magellan+Megacam survey to identify dwarfs ... | astro-ph_GA |
Optical Properties of High-Frequency Radio Sources from the Australia
Telescope 20 GHz (AT20G) Survey: Our current understanding of radio-loud AGN comes predominantly from studies
at frequencies of 5 GHz and below. With the recent completion of the Australia
Telescope 20 GHz (AT20G) survey, we can now gain insight in... | astro-ph_GA |
Aligned Grains and Scattered Light Found in Gaps of Planet-Forming Disk: Polarized (sub)millimeter emission from dust grains in circumstellar disks
was initially thought to be due to grains aligned with the magnetic field.
However, higher resolution multi-wavelength observations along with improved
models found that th... | astro-ph_GA |
The destruction and survival of dust in the shell around SN 2008S: SN 2008S erupted in early 2008 in the grand design spiral galaxy NGC 6946.
The progenitor was detected by Prieto et al. in Spitzer Space Telescope images
taken over the four years prior to the explosion, but was not detected in deep
optical images, from... | astro-ph_GA |
Constraints on the assembly history of the Milky Way's smooth, diffuse
stellar halo from the metallicity-dependent, radially-dominated velocity
anisotropy profiles probed with K giants and BHB stars using LAMOST,
SDSS/SEGUE, and Gaia: We analyze the anisotropy profile of the Milky Way's smooth, diffuse stellar
ha... | astro-ph_GA |
Kiloparsec-scale jets in three radio-loud narrow-line Seyfert 1 galaxies: We have discovered kiloparsec-scale extended radio emission in three
narrow-line Seyfert 1 galaxies (NLS1s) in sub-arcsecond resolution 9 GHz images
from the Karl G. Jansky Very Large Array (VLA). We find all sources show
two-sided, mildly core-d... | astro-ph_GA |
AlFoCS + Fornax3D: resolved star formation in the Fornax cluster with
ALMA and MUSE: We combine data from ALMA and MUSE to study the resolved (~300 pc scale) star
formation relation (star formation rate vs. molecular gas surface density) in
cluster galaxies. Our sample consists of 9 Fornax cluster galaxies, including... | astro-ph_GA |
Molecular outflows in local ULIRGs: energetics from multi-transition OH
analysis: We report on the energetics of molecular outflows in 14 local Ultraluminous
Infrared Galaxies (ULIRGs) that show unambiguous outflow signatures (P-Cygni
profiles or high-velocity absorption wings) in the far-infrared lines of OH
measure... | astro-ph_GA |
The anti-correlation between the hard X-ray photon index and the
Eddington ratio in LLAGNs: We find a significant anti-correlation between the hard X-ray photon index
and the Eddington ratio L_Bol/L_Edd for a sample of Low-Ionization Nuclear
Emission-line Regions (LINERs) and local Seyfert galaxies, compiled from
lit... | astro-ph_GA |
Missing dark matter in dwarf galaxies?: We use cosmological hydrodynamical simulations of the APOSTLE project along
with high-quality rotation curve observations to examine the fraction of
baryons in {\Lambda}CDM haloes that collect into galaxies. This 'galaxy
formation efficiency' correlates strongly and with little s... | astro-ph_GA |
GASP XXXIII. The ability of spatially resolved data to distinguish among
the different physical mechanisms affecting galaxies in low-density
environments: Galaxies inhabit a wide range of environments and therefore are affected by
different physical mechanisms. Spatially resolved maps combined with the
knowledge of... | astro-ph_GA |
Mass and Magnetic distributions in Self Gravitating Super Alfvenic
Turbulence with AMR: In this work, we present the mass and magnetic distributions found in a
recent Adaptive Mesh Refinement (AMR) MHD simulation of supersonic, \sa, self
gravitating turbulence. Powerlaw tails are found in both volume density and
magn... | astro-ph_GA |
Constraining the Galactic millisecond pulsar population using Fermi
Large Area Telescope: The Fermi Large Area Telescope (Fermi-LAT) has recently revealed a large
population of gamma-ray emitting millisecond pulsars (MSPs) in our Galaxy. We
aim to infer the properties of the Galactic population of gamma-ray emitting
... | astro-ph_GA |
Hierarchical structures in the Large and Small Magellanic Clouds: We investigate the degree of spatial correlation among extended structures in
the LMC and SMC. To this purpose we work with sub-samples characterised by
different properties such as age and size, taken from the updated catalogue of
Bica et al. or gathere... | astro-ph_GA |
New insights from deep VLA data on the potentially recoiling black hole
CID-42 in the COSMOS field: We present deep 3 GHz VLA observations of the potentially recoiling black
hole CID-42 in the COSMOS field. This galaxy shows two optical nuclei in the
HST/ACS image and a large velocity offset of ~ 1300 km/s between th... | astro-ph_GA |
The Catalogue for Astrophysical Turbulence Simulations (CATS): Turbulence is a key process in many fields of astrophysics. Advances in
numerical simulations of fluids over the last several decades have
revolutionized our understanding of turbulence and related processes such as
star formation and cosmic ray propagation... | astro-ph_GA |
Exploring the Galactic Anticenter substructure with LAMOST & Gaia DR2: We characterize the kinematic and chemical properties of 589 Galactic
Anticenter Substructure Stars (GASS) with K-/M- giants in Integrals-of-Motion
space. These stars likely include members of previously identified
substructures such as Monoceros, A... | astro-ph_GA |
The GLASS James Webb Space Telescope Early Release Science Program. I.
Survey Design and Release Plans: The GLASS James Webb Space Telescope Early Release Science (hereafter
GLASS-JWST-ERS) Program will obtain and make publicly available the deepest
extragalactic data of the ERS campaign. It is primarily designed to ... | astro-ph_GA |
The effect of primordial mass segregation on the size scale of globular
clusters: We use direct $N$-body calculations to investigate the impact of primordial
mass segregation on the size scale and mass-loss rate of star clusters in a
galactic tidal field. We run a set of simulations of clusters with varying
degrees o... | astro-ph_GA |
Gas expulsion in massive star clusters? Constraints from observations of
young and gas-free objects: Gas expulsion is a central concept in some of the models for multiple
populations and the light-element anticorrelations in globular clusters. If the
star formation efficiency was around 30 per cent and the gas expuls... | astro-ph_GA |
Polarization, Polarizing Efficiency, and Grain alignment towards the
direction of the cluster NGC 2345: We have investigated the grain alignment and dust properties towards the
direction of the cluster NGC 2345 using the multi-band optical polarimetric
observations. For the majority of the stars, the observed polariz... | astro-ph_GA |
The rapid transition from star-formation to AGN dominated rest-frame UV
light at z ~ 4: With the advent of deep optical-to-near-infrared extragalactic imaging on the
degree scale, samples of high-redshift sources are being selected that contain
both bright star-forming (SF) galaxies and faint active galactic nuclei (... | astro-ph_GA |
Evidence for photoionization-driven variability in narrow absorption
lines: In this Letter, we report the discovery of a strong correlation between the
variability of narrow absorption lines (NALs) and the ionizing continuum from a
two-epoch spectra sample of 40 quasars containing 52 variable C iv
{\lambda}{\lambda}1... | astro-ph_GA |
Local Stability of Galactic Discs in Modified Dynamics: The local stability of stellar and fluid discs, under a new modified
dynamical model, is surveyed by using WKB approximation. The exact form of the
modified Toomre criterion is derived for both types of systems and it is shown
that the new model is, in all situati... | astro-ph_GA |
Multivariate Approaches to Classification in Extragalactic Astronomy: Clustering objects into synthetic groups is a natural activity of any
science. Astrophysics is not an exception and is now facing a deluge of data.
For galaxies, the one-century old Hubble classification and the Hubble tuning
fork are still largely i... | astro-ph_GA |
Systematic variations of interstellar linear polarization and growth of
dust grains: A quantitative interpretation of the observed relation between the
interstellar linear polarization curve parameters $K$ and $\lambda_{\max}$
characterizing the width and the wavelength of a polarization maximum,
respectively, is giv... | astro-ph_GA |
Detecting the effect of non-thermal sources on the warm-hot Galactic
halo: We report the first detection of non-thermal broadening of OVII lines in the
warm-hot $\approx 10^6$ K circumgalactic medium (CGM) of the Milky Way. We use
$z$=0 absorption of OVII K$\alpha$, OVII K$\beta$, and OVIII K$\alpha$ lines in
archiva... | astro-ph_GA |
Dust-depletion sequences in damped Ly-α absorbers II. The
composition of cosmic dust, from low-metallicity systems to the Galaxy: We aim at assessing what are the most dominant dust species or types,
including silicate and iron oxide grains present in the ISM, by using recent
observations of dust depletion of galaxie... | astro-ph_GA |
Galaxy Zoo: constraining the origin of spiral arms: Since the discovery that the majority of low-redshift galaxies exhibit some
level of spiral structure, a number of theories have been proposed as to why
these patterns exist. A popular explanation is a process known as swing
amplification, yet there is no observationa... | astro-ph_GA |
Gas Dynamics in the Galaxy: Total Mass Distribution and the Bar Pattern
Speed: Gas morphology and kinematics in the Milky Way contain key information for
understanding the formation and evolution of our Galaxy. We present a high
resolution hydrodynamical simulation based on a realistic barred Milky Way
potential cons... | astro-ph_GA |
Rapid Black Hole Growth under Anisotropic Radiation Feedback: Discovery of high-redshift (z > 6) supermassive black holes (BHs) may
indicate that the rapid (or super-Eddington) gas accretion has aided their
quick growth. Here, we study such rapid accretion of the primordial gas on to
intermediate-mass (10^2 - 10^5 M_su... | astro-ph_GA |
Spectroscopic confirmation of the dwarf spheroidal galaxy d0944+71 as a
member of the M81 group of galaxies: We use Keck/DEIMOS spectroscopy to measure the first velocity and metallicity
of a dwarf spheroidal (dSph) galaxy beyond the Local Group using resolved
stars. Our target, d0944+71, is a faint dSph found in the... | astro-ph_GA |
The Relation Between [OIII]/H$β$ and Specific Star Formation Rate in
Galaxies at $z \sim 2$: Recent surveys have identified a seemingly ubiquitous population of galaxies
with elevated [OIII]/H$\beta$ emission line ratios at $z > 1$, though the
nature of this phenomenon continues to be debated. The [OIII]/H$\beta$ lin... | astro-ph_GA |
JWST Reveals Widespread AGN-Driven Neutral Gas Outflows in Massive z ~ 2
Galaxies: We use deep JWST/NIRSpec R~1000 slit spectra of 113 galaxies at 1.7 < z <
3.5, selected from the mass-complete Blue Jay survey, to investigate the
prevalence and typical properties of neutral gas outflows at cosmic noon. We
detect exce... | astro-ph_GA |
SDSS-IV MaNGA: the indispensable role of bars in enhancing the central
star formation of low-$z$ galaxies: We analyse two-dimensional maps and radial profiles of EW(H$\alpha$),
EW(H$\delta_A$), and D$_n$(4000) of low-redshift galaxies using integral field
spectroscopy from the MaNGA survey. Out of $\approx1400$ nearl... | astro-ph_GA |
Constraints on interstellar dust models from extinction and
spectro-polarimetry: We present polarisation spectra of seven stars in the lines-of-sight towards
the Sco OB1 association. Our spectra were obtained within the framework of the
Large Interstellar Polarization Survey carried out with the FORS instrument of
th... | astro-ph_GA |
Sub-arcsecond imaging of the water emission in Arp 220: Extragalactic observations of water emission can provide valuable insights
into the excitation of the interstellar medium. In addition, extragalactic
megamasers are powerful probes of kinematics close to active nuclei. Therefore,
it is paramount to determine the t... | astro-ph_GA |
KMOS LENsing Survey (KLENS) : morpho-kinematic analysis of star-forming
galaxies at $z \sim 2$: We present results from the KMOS lensing survey-KLENS which is exploiting
gravitational lensing to study the kinematics of 24 star forming galaxies at
$1.4<z<3.5$ with a median mass of $\rm log(M_\star/M_\odot)=9.6$ and me... | astro-ph_GA |
Radio Loud and Radio Quiet Quasars: We discuss 6 GHz JVLA observations covering a volume-limited sample of 178
low redshift ($0.2 < z < 0.3$) optically selected QSOs. Our 176 radio
detections fall into two clear categories: (1) About $20$\% are radio-loud QSOs
(RLQs) having spectral luminosities $L_6 \gtrsim 10^{\,23.2... | astro-ph_GA |
Molecular gas and a new young stellar cluster in the far outer Galaxy: We investigate the star-formation ocurring in the region towards
IRAS07527-3446 in the molecular cloud [MAB97]250.63-3.63, in the far outer
Galaxy. We report the discovery of a new young stellar cluster, and describe
its properties and those of its ... | astro-ph_GA |
The impact of baryonic physics on the subhalo mass function and
implications for gravitational lensing: We investigate the impact of baryonic physics on the subhalo population by
analyzing the results of two recent hydrodynamical simulations (EAGLE and
Illustris), which have very similar configuration, but a differen... | astro-ph_GA |
Unlocking the Full Potential of Extragalactic Ly$α$ through Its
Polarization Properties: Lyman-$\alpha$ (Ly$\alpha$) is a powerful astrophysical probe. Not only is it
ubiquitous at high redshifts, it is also a resonant line, making Ly$\alpha$
photons scatter. This scattering process depends on the physical conditions... | astro-ph_GA |
The Evolution of Environmental Quenching Timescales to $z\sim1.6$: Using a sample of 4 galaxy clusters at $1.35 < z < 1.65$ and 10 galaxy
clusters at $0.85 < z < 1.35$, we measure the environmental quenching
timescale, $t_Q$, corresponding to the time required after a galaxy is accreted
by a cluster for it to fully cea... | astro-ph_GA |
Science with an ngVLA: Understanding Massive Star Formation through
Maser Imaging: Imaging the bright maser emission produced by several molecular species at
centimeter wavelengths is an essential tool for understanding the process of
massive star formation because it provides a way to probe the kinematics of
dense m... | astro-ph_GA |
Spatial variations of magnetic field along active galactic nuclei jets
on sub-pc to Mpc scales: We report the systematic analysis of knots, hotspots, and lobes in 57 active
galactic nuclei (AGNs) to investigate the variation of the magnetic field along
with the jet from the sub-pc base to the terminus in kpc-to-Mpc s... | astro-ph_GA |
Disruption of the Orion Molecular Core 1 by the stellar wind of the
massive star $θ^1$ Ori C: Massive stars inject mechanical and radiative energy into the surrounding
environment, which stirs it up, heats the gas, produces cloud and intercloud
phases in the interstellar medium, and disrupts molecular clouds (the bir... | astro-ph_GA |
Probabilities for Solar Siblings: We have shown previously (Bobylev et al 2011) that some of the stars in the
Solar neighborhood today may have originated in the same star cluster as the
Sun, and could thus be called Solar Siblings. In this work we investigate the
sensitivity of this result to Galactic models and to pa... | astro-ph_GA |
The Optically Unbiased Gamma-Ray Burst Host (TOUGH) Survey. VII. The
Host Galaxy Luminosity Function: Probing the Relationship Between GRBs and
Star Formation to Redshift $\sim6$: Gamma-ray bursts (GRBs) offer a route to characterizing star-forming galaxies
and quantifying high-$z$ star formation that is distinct f... | astro-ph_GA |
Optical Discovery of an Apparent Galactic Supernova Remnant G159.6+7.3: Deep Halpha images of portions of a faint 3 x 4 degree Halpha shell centered
at l = 159.6 deg, b = 7.3 deg seen on the Virginia Tech Spectral Line Survey
images revealed the presence of several thin emission filaments along its
eastern limb. Low-di... | astro-ph_GA |
Morpho-kinematic properties of field S0 bulges in the CALIFA survey: We study a sample of 28 S0 galaxies extracted from the integral-field
spectroscopic (IFS) survey CALIFA. We combine an accurate two-dimensional (2D)
multi-component photometric decomposition with the IFS kinematic properties of
their bulges to underst... | astro-ph_GA |
Evidence for gravitational quadrupole moment variations in the companion
of PSR J2051-0827: We have conducted radio timing observations of the eclipsing millisecond
binary pulsar J2051-0827 with the European Pulsar Timing Array network of
telescopes and the Parkes radio telescope, spanning over 13 years. The
increase... | astro-ph_GA |
Simulating radio synchrotron emission in star-forming galaxies:
small-scale magnetic dynamo and the origin of the far infrared-radio
correlation: In star-forming galaxies, the far-infrared (FIR) and radio-continuum
luminosities obey a tight empirical relation over a large range of
star-formation rates (SFR). We exa... | astro-ph_GA |
The effect of the deforming dark matter haloes of the Milky Way and the
Large Magellanic Cloud on the Orphan-Chenab stream: It has recently been shown that the Large Magellanic Cloud (LMC) has a
substantial effect on the Milky Way's stellar halo and stellar streams. Here,
we explore how deformations of the Milky Way ... | astro-ph_GA |
Note on fundamental physics tests from black hole imaging: Comment on
"Hunting for extra dimensions in the shadow of Sagittarius A$^*$": Several works over the past years have discussed the possibility of testing
fundamental physics using Very Long Baseline Interferometry horizon-scale black
hole (BH) images, such as... | astro-ph_GA |
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