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On the Helium fingers in the intracluster medium: In this paper we investigate the convection phenomenon in the intracluster
medium (the weakly-collisional magnetized inhomogeneous plasma permeating
galaxy clusters) where the concentration gradient of the Helium ions is not
ignorable. To this end, we build upon the gen... | astro-ph_GA |
The Galactic bar and the large scale velocity gradients in the Galactic
disk: Aims: We investigate whether the cylindrical (galactocentric) radial velocity
gradient of ~ -3 km/s/kpc, directed radially from the Galactic center and
recently observed in the stars of the solar neighborhood with the RAVE survey,
can be ex... | astro-ph_GA |
Taking apart the dynamical clock. Fat-tailed dynamical kicks shape the
blue-straggler star bimodality: In globular clusters, blue straggler stars are heavier than the average star,
so dynamical friction strongly affects them. The radial distribution of BSS,
normalized to a reference population, appears bimodal in a f... | astro-ph_GA |
Radio--Far infrared correlation in "blue cloud" galaxies with 0<z<1.2: We study the radio--far infrared (FIR) correlation in "blue cloud" galaxies
chosen from the PRism MUltiobject Survey (PRIMUS) up to redshift ($z$) of 1.2
in the XMM-LSS field. We use rest-frame emission at 1.4 GHz in the radio and
both monochromatic... | astro-ph_GA |
Measuring bar pattern speeds from single simulation snapshots: We describe methods to measure simultaneously the orientation angle $\psi$
and pattern speed $\Omega$ from single snapshots of simulated barred galaxies.
Unlike previous attempts, our approach is unbiased, precise, and consistent in
the sense that $\psi=\in... | astro-ph_GA |
HI-shielding of ${\rm H_2}$ in UV-irradiated protogalaxies: suppression
of the photodissociation rate: We study the impact of neutral hydrogen absorption on ${\rm H_2}$
photodissociation in protogalactic haloes exposed to soft-UV radiation.
Lyman-series absorption can significantly deplete dissociating photons as lin... | astro-ph_GA |
First Extended Catalogue of Galactic Bubbles InfraRed Fluxes from WISE
and Herschel Surveys: In this paper, we present the first extended catalogue of far-infrared fluxes
of Galactic bubbles. Fluxes were estimated for 1814 bubbles, defined here as
the `golden sample', and were selected from the Milky Way Project Firs... | astro-ph_GA |
A powerful (and likely young) radio-loud quasar at z=5.3: We present the discovery of PSO J191.05696$+$86.43172 (hereafter PSO
J191$+$86), a new powerful radio-loud quasar (QSO) in the early Universe (z =
5.32). We discovered it by cross-matching the NRAO VLA Sky Survey (NVSS) radio
catalog at 1.4 GHz with the first da... | astro-ph_GA |
VII Zw 403: HI Structure in a Blue Compact Dwarf Galaxy: We present optical (UBVJ), ultraviolet (FUV, NUV), and high resolution atomic
hydrogen (HI) observations of the nearby blue compact dwarf (BCD), VII Zw 403.
We find that VII Zw 403 has a relatively high HI mass-to-light ratio for a BCD.
The rotation velocity is n... | astro-ph_GA |
Chemical Cartography. I. A Carbonicity Map of the Galactic Halo: We present the first map of carbonicity, [C/Fe], for the halo system of the
Milky Way, based on a sample of over 100,000 main-sequence turnoff stars with
available spectroscopy from the Sloan Digital Sky Survey. This map, which
explores distances up to 15... | astro-ph_GA |
ALMA observations of the archetypal "hot core" that isn't: Orion KL: We present sensitive high angular resolution ($\sim$ 0.1$''$ -- 0.3$''$)
continuum ALMA (The Atacama Large Millimeter/Submillimeter Array) observations
of the archetypal hot core located in Orion-KL. The observations were made in
five different spectr... | astro-ph_GA |
Comparison of distance measurements to dust clouds using GRB X-ray halos
and 3D dust extinction: X-ray photons from energetic sources such as gamma-ray bursts (GRBs) can be
scattered on dust clouds in the Milky Way, creating a time-evolving halo around
the GRB position. X-ray observations of such halos allow the meas... | astro-ph_GA |
The Sixteenth Data Release of the Sloan Digital Sky Surveys: First
Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra: This paper documents the sixteenth data release (DR16) from the Sloan Digital
Sky Surveys; the fourth and penultimate from the fourth phase (SDSS-IV). This
is the first relea... | astro-ph_GA |
The influence of magnetic field on the CNM mass fraction and its
alignment with density structures: To contribute to the understanding of the magnetic field's influence on the
segregation of CNM in the solar neighbourhood we analyse MHD simulations which
include the main physical characteristics of the local neutral ... | astro-ph_GA |
Optical Imaging & Spectral Study of FR-I Type Radio Galaxy:CTD 086 (B2
1422+26B): We present optical imaging and spectroscopic studies of the Fanaroff \& Riley
class I (FR I) radio galaxy CTD 086 based on Hubble Space Telescope (HST) and
Sloan Digital Sky Survey (SDSS) observations. We use isophote shape analysis to
... | astro-ph_GA |
Direct observations of the atomic-molecular phase transition in the
Milky Way's nuclear wind: Hundreds of high-velocity atomic gas clouds exist above and below the
Galactic Centre, with some containing a molecular component. However, the
origin of these clouds in the Milky Way's wind is unclear. This paper presents
n... | astro-ph_GA |
Rotation Curves in z~1-2 Star-Forming Disks: Evidence for Cored Dark
Matter Distributions: We report high quality, Halpha or CO rotation curves (RCs) to several Re for
41 large, massive, star-forming disk galaxies (SFGs), across the peak of cosmic
galaxy evolution (z~0.67-2.45), taken with the ESO-VLT, the LBT and IR... | astro-ph_GA |
The Local Cluster Survey II: Disk-Dominated Cluster Galaxies with
Suppressed Star Formation: We investigate the role of dense environments in suppressing star formation
by studying $\rm \log_{10}(M_\star/M_\odot) > 9.7$ star-forming galaxies in
nine clusters from the Local Cluster Survey ($0.0137 < z < 0.0433$) and a... | astro-ph_GA |
Shadows around Sgr A* and M87* as a tool to test gravity theories: In the framework of Randall -- Sundrum theory with extra dimension Reissner
-- Nordstr\"om black hole solutions with a tidal charge have been found. The
shadow around the supermassive black hole in M87 was reconstructed in 2019
based on observations wit... | astro-ph_GA |
First sample of $\rm N_2H^+$ nitrogen isotopic ratio measurements in
low-mass protostars: Context. The nitrogen isotopic ratio is considered an important diagnostic
tool of the star formation process, and $N_2H^+$ is particularly important
because it is directly linked to molecular nitrogen $N_2$. However, theoretica... | astro-ph_GA |
The origin of low-surface-brightness galaxies in the dwarf regime: Low-surface-brightness galaxies (LSBGs) -- defined as systems that are
fainter than the surface-brightness limits of past wide-area surveys -- form
the overwhelming majority of galaxies in the dwarf regime (M* < 10^9 MSun).
Using NewHorizon, a high-reso... | astro-ph_GA |
30 GHz monitoring of broad absorption line (BAL) quasars: Broad absorption line (BAL) quasars have been studied for over thirty years.
Yet it is still unclear why and when we observe broad absorption lines in
quasars. Is this phenomenon caused by geometry or is it connected with the
evolution process? Variability of th... | astro-ph_GA |
COSMOS2020: Investigating the AGN-obscured accretion phase at $z\sim 1$
via [NeV] selection: We investigated the properties of 94 [NeV]3426AA-selected type 2 AGN in
COSMOS at z=0.6-1.2, performing optical-to-far-infrared spectral energy
distribution fitting. In addition, we analyze the X-ray spectra of the
X-ray-dete... | astro-ph_GA |
Atomic and Molecular Absorption in Redshifted Radio Sources: We report on a survey for associated HI 21-cm and OH 18-cm absorption with
the Giant Metrewave Radio Telescope at redshifts z = 0.2-0.4. Although the low
redshift selection ensures that our targets are below the critical ultra-violet
luminosity, which is hypo... | astro-ph_GA |
Probing the hot circumgalactic medium of external galaxies in X-ray
absorption II: a luminous spiral galaxy at $z\approx 0.225$: The circumgalactic medium (CGM) is the most massive baryonic component of a
spiral galaxy, shock heated to about $10^6$K for an $\rm L^{\star}$ galaxy. The
CGM of the Milky Way has been wel... | astro-ph_GA |
Galactic nebular lines in the fiber spectra of background QSOs: Reaching
a hundred QSO-galaxy pairs with spectroscopic and photometric measurements: We present photometric and spectroscopic measurements of 53 QSO-galaxy pairs
from the Sloan Digital Sky Survey, where nebular emission lines from a 0<z<0.84
foreground g... | astro-ph_GA |
JADES. The diverse population of infant Black Holes at 4<z<11: merging,
tiny, poor, but mighty: We present 12 new AGN at 4<z<7 in the JADES survey (in addition to the
previously identified AGN in GN-z11 at z=10.6) revealed through the detection
of a Broad Line Region as seen in Halpha. The depth of JADES, together wi... | astro-ph_GA |
Compton Thick AGN in the 70 Month Swift-BAT All-Sky Hard X-ray Survey: a
Bayesian approach: The 70-month Swift/BAT catalogue provides a sensitive view of the
extragalactic X-ray sky at hard energies (>10 keV) containing about 800 Active
Galactic Nuclei. We explore its content in heavily obscured, Compton-thick AGN
by... | astro-ph_GA |
Differences and similarities of stellar populations in LAEs and LBGs at
$z\sim$ 3.4 - 6.8: The differences between the inherent stellar populations (SPs) of LAEs and
LBGs are a key factor in understanding early galaxy formation and evolution. We
have run a set of SP burst-like models for a sample of 1,558 sources at
... | astro-ph_GA |
An astrophysically motivated ranking criterion for low-latency
electromagnetic follow-up of gravitational wave events: We investigate the properties of the host galaxies of compact binary mergers
across cosmic time. To this end, we combine population synthesis simulations
together with galaxy catalogues from the hydr... | astro-ph_GA |
The UV, Lyman-alpha, and dark matter halo properties of high redshift
galaxies: We explore the properties of high-redshift Lyman-alpha emitters (LAE), and
their link with the Lyman-Break galaxy population (LBG), using a semi-analytic
model of galaxy formation that takes into account resonant scattering of Lya
photons... | astro-ph_GA |
A multiwavelength study of the star forming region IRAS 18544+0112: This work aims at investigating the molecular and infrared components in the
massive young stellar object (MYSO) candidate IRAS 18544+0112. The purpose is
to determine the nature and the origin of this infrared source. To analyze the
molecular gas towa... | astro-ph_GA |
A thorough view of the nuclear region of NGC 253 - Combined Herschel,
SOFIA and APEX dataset: We present a large set of spectral lines detected in the $40"$ central region
of the starburst galaxy NGC 253. Observations were obtained with the three
instruments SPIRE, PACS and HIFI on board the Herschel Space Observator... | astro-ph_GA |
Mid and Far-Infrared Color-Color Relations within Local Galaxies: We present an extensive archival analysis of a sample of local galaxies,
combining multi-wavelength data from GALEX, Spitzer and Herschel to investigate
"blue-side" mid-infrared (MIR) and "red-side" far-infrared (FIR) color-color
correlations within the ... | astro-ph_GA |
The Case Against Dark Matter and Modified Gravity: Flat Rotation Curves
Are a Rigorous Requirement in Rotating Self-Gravitating Newtonian Gaseous
Disks: By solving analytically the various types of Lane-Emden equations with
rotation, we have discovered two new coupled fundamental properties of
rotating, self-gravit... | astro-ph_GA |
Radio-Loud and Radio-Quiet BAL Quasars: A Detailed Ultraviolet
Comparison: Studies of radio-loud (RL) broad absorption line (BAL) quasars indicate that
popular orientation-based BAL models fail to account for all observations. Are
these results extendable to radio-quiet (RQ) BAL quasars? Comparisons of RL and
RQ BAL ... | astro-ph_GA |
Lyman-alpha spectroscopy of extreme [OIII] emitting galaxies at
$z\simeq2-3$: Implications for Ly$α$ visibility and LyC leakage at $z>6$: Spectroscopic observations of massive $z>7$ galaxies selected to have
extremely large [OIII]+H$\beta$ equivalent width (EW $\sim1500$ \r{A}) have
recently revealed large Ly$\alpha$... | astro-ph_GA |
The formation of cosmic fullerenes from arophatic clusters: Fullerenes have recently been identified in space and they may play a
significant role in the gas and dust budget of various astrophysical objects
including planetary nebulae (PNe), reflection nebulae (RNe) and H II regions.
The tenuous nature of the gas in th... | astro-ph_GA |
Stream Members Only: Data-Driven Characterization of Stellar Streams
with Mixture Density Networks: Stellar streams are sensitive probes of the Milky Way's gravitational
potential. The mean track of a stream constrains global properties of the
potential, while its fine-grained surface density constrains galactic
subs... | astro-ph_GA |
Infall of nearby galaxies into the Virgo cluster as traced with HST: We measured the Tip of the Red Giant Branch distances to nine galaxies in the
direction to the Virgo cluster using the Advanced Camera for Surveys on the
Hubble Space Telescope. These distances put seven galaxies: GR 34, UGC 7512,
NGC 4517, IC 3583, N... | astro-ph_GA |
FSR 1716: A new Milky Way Globular Cluster confirmed using VVV RR Lyrae
stars: We use deep multi-epoch near-IR images of the VISTA Variables in the V\'ia
L\'actea (VVV) Survey to search for RR Lyrae stars towards the Southern
Galactic plane. Here we report the discovery of a group of RR Lyrae stars close
together in ... | astro-ph_GA |
Physical conditions in high$-$z optically thin C III absorbers: Origin
of cloud sizes and associated correlations: We present detailed photoionization models of well aligned optically thin C
III absorption components at $2.1 < z < 3.4$. Using our models we estimate
density ($n_{\rm \tiny H}$), metallicity ($[C/H]$), ... | astro-ph_GA |
Nature of shocks revealed by SOFIA OI observations in the Cepheus E
protostellar outflow: Protostellar jets and outflows are key features of the star-formation
process, and primary processes of the feedback of young stars on the
interstellar medium. Understanding the underlying shocks is necessary to
explain how jets... | astro-ph_GA |
The SEDIGISM survey: a search for molecular outflows: Context. The formation processes of massive stars are still unclear but a
picture is emerging involving accretion disks and molecular outflows in what
appears to be a scaled-up version of low-mass star formation. A census of
outflow activity towards massive star-for... | astro-ph_GA |
Can we believe the strong-line abundances in giant HII regions and
emission-line galaxies?: This review is not a compendium of strong-line methods to derive abundances
in giant HII regions. It is mostly intended for readers who wish to use such
methods but do not have a solid background on the physics of HII regions.... | astro-ph_GA |
Spectroscopy of the three distant Andromedan satellites Cassiopeia III,
Lacerta I, and Perseus I: We present Keck II/DEIMOS spectroscopy of the three distant dwarf galaxies of
M31 Lacerta I, Cassiopeia III, and Perseus I, recently discovered within the
Pan-STARRS1 3\pi imaging survey. The systemic velocities of the t... | astro-ph_GA |
Models of turbulent dissipation regions in the diffuse interstellar
medium: Supersonic turbulence is a large reservoir of suprathermal energy in the
interstellar medium. Its dissipation, because it is intermittent in space and
time, can deeply modify the chemistry of the gas. We further explore a hybrid
method to com... | astro-ph_GA |
Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?: A great challenge in present-day physics is to understand whether the
observed internal dynamics of galaxies is due to dark matter matter or due to a
modification of the law of gravity. Recently, van Dokkum et al. reported that
the ultra-diffuse dwarf galaxy NGC... | astro-ph_GA |
A 500 pc filamentary gas wisp in the disk of the Milky Way: Star formation occurs in molecular gas. In previous studies, the structure of
the molecular gas has been studied in terms of molecular clouds, but has been
overlooked beyond the cloud scale. We present an observational study of the
molecular gas at 49.5 degree... | astro-ph_GA |
The potential of tracing the star formation history with HI 21-cm in
intervening absorption systems: Unlike the neutral gas density, which remains largely constant over redshifts
of 0 < z < 5, the star formation density exhibits a strong redshift dependence,
increasing from the present day before peaking at a redshif... | astro-ph_GA |
On planet formation around supermassive black holes and the grain
disruption barriers by radiative torques: It has recently been suggested that planets can form by dust coagulation in
the torus of active galactic nuclei (AGN) with low luminosity of $L_{\rm
bol}\lesssim 10^{42} erg s^{-1}$, constituting a new class of... | astro-ph_GA |
Resolved Near-infrared Stellar Photometry from the Magellan Telescope
for 13 Nearby Galaxies: JAGB Method Distances: We present near-infrared JHK photometry for the resolved stellar populations
in 13 nearby galaxies: NGC 6822, IC 1613, NGC 3109, Sextans B, Sextans A, NGC
300, NGC 55, NGC 7793, NGC 247, NGC 5253, Cen ... | astro-ph_GA |
The MUSE-Wide survey: A measurement of the Ly$α$ emitting fraction
among $z>3$ galaxies: We present a measurement of the fraction of Lyman $\alpha$ (Ly$\alpha$)
emitters ($X_{\rm{Ly} \alpha}$) amongst HST continuum-selected galaxies at
$3<z<6$ with the Multi-Unit Spectroscopic Explorer (MUSE) on the VLT. Making
use o... | astro-ph_GA |
Heating Cold Clumps by Jet-inflated Bubbles in Cooling Flow Clusters: We simulate the evolution of dense-cool clumps embedded in the intra-cluster
medium (ICM) of cooling flow clusters of galaxies in response to multiple
jet-activity cycles, and find that the main heating process of the clumps is
mixing with the hot sh... | astro-ph_GA |
SDSS-IV MaNGA: The Nature of an Off-galaxy H$α$ Blob -- A
Multi-wavelength View of Offset Cooling in a Merging Galaxy Group: Galaxies in dense environments, such as groups and clusters, experience
various processes by which galaxies gain and lose gas. Using data from the
SDSS-IV MaNGA survey, we previously reported t... | astro-ph_GA |
Swirls of FIRE: Spatially Resolved Gas Velocity Dispersions and Star
Formation Rates in FIRE-2 Disk Environments: We study the spatially resolved (sub-kpc) gas velocity dispersion
($\sigma$)--star formation rate (SFR) relation in the FIRE-2 (Feedback in
Realistic Environments) cosmological simulations. We specificall... | astro-ph_GA |
The Environment of z >1 3CR Radio Galaxies and QSOs: From Proto-Clusters
to Clusters of Galaxies?: We study the cluster environment for a sample of 21 radio loud AGN from the
3CR catalog at z>1, 12 radio galaxies and 9 quasars with HST images in the
optical and IR. We use two different approaches to determine cluster... | astro-ph_GA |
MHD Simulation of The Inner Galaxy with Radiative Cooling and Heating: We investigate the role of magnetic field on the gas dynamics in the Galactic
bulge region by three dimensional simulations with radiative cooling and
heating. While high-temperature corona with $T>10^6\ {\rm K}$ is formed in the
halo regions, the t... | astro-ph_GA |
High Resolution Near-Infrared Survey of the Pipe Nebula I: A Deep
Infrared Extinction Map of Barnard 59: We present our analysis of a fully sampled, high resolution dust extinction
map of the Barnard 59 complex in the Pipe Nebula. The map was constructed with
the infrared color excess technique applied to a photometr... | astro-ph_GA |
The origin of high velocity stars from Gaia and LAMOST: Based on the second Gaia data (Gaia DR2) and spectroscopy from the LAMOST
Data Release 5, we defined the high-velocity (HiVel) stars sample as those
stars with $v_{\mathrm{gc}} > 0.85 v_{\mathrm{esc}}$, and derived the final
sample of 24 HiVel stars with stellar a... | astro-ph_GA |
Time-delay measurement of MgII broad line response for the
highly-accreting quasar HE 0413-4031: Implications for the MgII-based
radius-luminosity relation: We present the monitoring of the AGN continuum and MgII broad line emission
for the quasar HE 0413-4031 ($z=1.38$) based on the six-year monitoring by the
Sout... | astro-ph_GA |
Driven Multifluid MHD Molecular Cloud Turbulence: It is believed that turbulence may have a significant impact on star
formation and the dynamics and evolution of the molecular clouds in which this
occurs. It is also known that non-ideal magnetohydrodynamic effects influence
the nature of this turbulence. We present th... | astro-ph_GA |
Plasma dark matter direct detection: Dark matter in spiral galaxies like the Milky Way may take the form of a dark
plasma. Hidden sector dark matter charged under an unbroken $U(1)'$ gauge
interaction provides a simple and well defined particle physics model realising
this possibility. The assumed $U(1)'$ neutrality of... | astro-ph_GA |
A systematic DECam search for RR Lyrae in the outer halo of the Milky
Way: The discovery of very distant stars in the halo of the Milky Way provides
valuable tracers on the Milky Way mass and its formation. Beyond 100 kpc from
the Galactic center, most of the stars are likely to be in faint dwarf galaxies
or tidal de... | astro-ph_GA |
From the Outside Looking in: What can Milky Way Analogues Tell us About
the Star Formation Rate of Our Own Galaxy?: The Milky Way has been described as an anaemic spiral, but is its star
formation rate (SFR) unusually low when compared to its peers? To answer this
question, we define a sample of Milky Way Analogues (... | astro-ph_GA |
An Intensity Mapping Detection of Aggregate CO Line Emission at 3 mm: We present a detection of molecular gas emission at $z\sim1-5$ using the
technique of line intensity mapping. We make use of a pair of 3 mm
interferometric data sets, the first from the ALMA Spectroscopic Survey in the
Hubble Ultra Deep Field (ASPECS... | astro-ph_GA |
A Search For Supernova Remnants in The Nearby Spiral Galaxy M74 (NGC
628): We have identified nine new SNR candidates in M74 with [S II]/H$\alpha$
$\geq$ 0.4 as the basic criterion. We obtain [S II]/H$\alpha$ ratio in the
range from 0.40 to 0.91 and H$\alpha$ intensities from 2.8 $\times$ $10^{-15}$
erg cm$^{-2}$ s$^... | astro-ph_GA |
An HST/COS Observation of Broad Ly$α$ Emission and Associated
Absorption Lines of the BL Lacertae Object H 2356-309: Weak spectral features in BL Lacertae objects (BL Lac) often provide a unique
opportunity to probe the inner region of this rare type of active galactic
nucleus. We present a Hubble Space Telescope/Cos... | astro-ph_GA |
Element Abundances in a Gas-rich Galaxy at z = 5: Clues to the Early
Chemical Enrichment of Galaxies: Element abundances in high-redshift quasar absorbers offer excellent probes
of the chemical enrichment of distant galaxies, and can constrain models for
population III and early population II stars. Recent observatio... | astro-ph_GA |
Unravelling the nature of the dual AGN in the galaxy pair system IRAS
05589+2828 and 2MASX J06021107+2828382: We have studied the nuclear region of the previously detected dual AGN system
in the galaxy pair IRAS 05589+2828 and 2MASX J06021107+2828382 through new
optical spectroscopy observations, along with radio and... | astro-ph_GA |
New Maser Emission from Nonmetastable Ammonia in NGC 7538. III.
Detection of the (10,6) Transition and a Velocity Gradient: We present the first astronomical detection of the 14NH3 (J,K) = (10,6) line:
nonthermal emission at several velocities in the Galactic star-forming region
NGC 7538. Using the VLA we have imaged... | astro-ph_GA |
Mixing and transport of metals by gravitational instability-driven
turbulence in galactic discs: Metal production in galaxies traces star formation, and is highly
concentrated toward the centers of galactic discs. This suggests that galaxies
should have inhomogeneous metal distributions with strong radial gradients, ... | astro-ph_GA |
Revisiting the bulge-halo conspiracy I: Dependence on galaxy properties
and halo mass: We carry out a systematic investigation of the total mass density profile of
massive (Mstar>2e11 Msun) early-type galaxies and its dependence on galactic
properties and host halo mass with the aid of a variety of lensing/dynamical
... | astro-ph_GA |
Precipitation-Regulated Star Formation in Galaxies: Galaxy growth depends critically on the interplay between radiative cooling
of cosmic gas and the resulting energetic feedback that cooling triggers. This
interplay has proven exceedingly difficult to model, even with large
supercomputer simulations, because of its co... | astro-ph_GA |
The Galaxy's Veil of Excited Hydrogen: Many of the baryons in our Galaxy probably lie outside the well known disk
and bulge components. Despite a wealth of evidence for the presence of some gas
in galactic halos, including absorption line systems in the spectra of quasars,
high velocity neutral hydrogen clouds in our G... | astro-ph_GA |
Discovery of H2O Megamasers in Obscured Active Galactic Nuclei: Recently a new method to discover obscured active galactic nuclei (AGNs) by
utilizing X-ray and Infrared data has been developed. We carried out a survey
of H2O maser emission toward ten obscured AGNs with the Nobeyama 45-m
telescope. We newly detected the... | astro-ph_GA |
The Ionized Gas in Nearby Galaxies as Traced by the [NII] 122 and 205
μm Transitions: The [NII] 122 and 205 \mu m transitions are powerful tracers of the ionized
gas in the interstellar medium. By combining data from 21 galaxies selected
from the Herschel KINGFISH and Beyond the Peak surveys, we have compiled 141
spa... | astro-ph_GA |
Revealing a detailed mass distribution of a high-density core
MC27/L1521F in Taurus with ALMA: We present the results of ALMA observations of dust continuum emission and
molecular rotational lines toward a dense core MC27 (aka L1521F) in Taurus,
which is considered to be at a very early stage of star formation. The d... | astro-ph_GA |
Constraints on Individual Supermassive Black Hole Binaries from Pulsar
Timing Array Limits on Continuous Gravitational Waves: Pulsar timing arrays (PTAs) are placing increasingly stringent constraints on
the strain amplitude of continuous gravitational waves emitted by supermassive
black hole binaries on subparsec sc... | astro-ph_GA |
ALMA Deep Field in SSA22: Survey Design and Source Catalog of a 20
arcmin^2 Survey at 1.1mm: To search for dust-obscured star-formation activity in the early Universe, it
is essential to obtain a deep and wide submillimeter/millimeter map. The advent
of the Atacama Large Millimeter/submillimeter Array (ALMA) has enab... | astro-ph_GA |
Selecting accreted populations: metallicity, elemental abundances, and
ages of the Gaia-Sausage-Enceladus and Sequoia populations: Identifying stars found in the Milky Way as having formed in situ or accreted
can be a complex and uncertain undertaking. We use Gaia kinematics and APOGEE
elemental abundances to select ... | astro-ph_GA |
Temperature structure and kinematics of the IRDC G035.39-00.33: Aims. Infrared dark clouds represent the earliest stages of high-mass star
formation. Detailed observations of their physical conditions on all physical
scales are required to improve our understanding of their role in fueling star
formation.
Methods. We... | astro-ph_GA |
A Change of Rotation Profile in the Envelope in the HH 111 Protostellar
System: A Transition to a Disk?: The HH 111 protostellar system consists of two Class I sources (VLA 1 and 2)
with putative disks deeply embedded in a flattened envelope at a distance of
400 pc. Here is a follow-up study of this system in C18O (J... | astro-ph_GA |
The location of the dust causing internal reddening of active galactic
nuclei: We use the Balmer decrements of the broad-line regions (BLRs) and narrow-line
regions (NLRs) of active galactic nuclei (AGNs) as reddening indicators to
investigate the location of the dust for four samples of AGNs with reliable
estimates ... | astro-ph_GA |
Radio continuum emission and water masers towards CB 54: We present high angular resolution observations of water masers at 1.3 cm and
radio continuum emission at 1.3, 3.6 and 6 cm towards the Bok globule CB 54
using the Very Large Array. At 1.3 cm, with subarsecond angular resolution, we
detect a radio continuum compa... | astro-ph_GA |
The origin of carbon: Low-mass stars and an evolving, initially
top-heavy IMF?: Multi-zone chemical evolution models (CEMs), differing in the nucleosynthesis
prescriptions (yields) and prescriptions of star formation, have been computed
for the Milky Way. All models fit the observed O/H and Fe/H gradients well and
re... | astro-ph_GA |
Optical photometry and basic parameters of 10 unstudied open clusters: We present BVI CCD photometry of 10 northern open clusters, Berkeley 43,
Berkeley 45, Berkeley 47, NGC 6846, Berkeley 49, Berkeley 51, Berkeley 89,
Berkeley 91, Tombaugh 4 and Berkeley 9, and estimate their fundamental
parameters. Eight of the clust... | astro-ph_GA |
Doubly substituted isotopologues of HCCCN in TMC-1: Detection of
D13CCCN, DC13CCN, DCC13CN, DCCC15N, H13C13CCN, H13CC13CN, HC13C13CN,
HCC13C15N, and HC13CC15N: We report the first detection in space of a complete sample of nine doubly
substituted isotopologues of HCCCN towards the cyanopolyyne peak of TMC-1 using
o... | astro-ph_GA |
Mapping the Polarization of the Radio-Loud Ly$α$ Nebula B3
J2330+3927: Lya nebulae, or "Lya blobs", are extended (up to ~100 kpc), bright (L[Lya] >
10^43 erg/s) clouds of Lya emitting gas that tend to lie in overdense regions
at z ~ 2--5. The origin of the Lya emission remains unknown, but recent
theoretical work sug... | astro-ph_GA |
Ionized and molecular gas kinematics in a z=1.4 star-forming galaxy: We present deep observations of a $z=1.4$ massive, star-forming galaxy in
molecular and ionized gas at comparable spatial resolution (CO 3-2, NOEMA;
H$\alpha$, LBT). The kinematic tracers agree well, indicating that both gas
phases are subject to the ... | astro-ph_GA |
The Next Generation Virgo cluster Survey (NGVS). XXVI. The issues of
photometric age and metallicity estimates for globular clusters: Large samples of globular clusters (GC) with precise multi-wavelength
photometry are becoming increasingly available and can be used to constrain the
formation history of galaxies. We ... | astro-ph_GA |
Giant molecular clouds in M 33: are they susceptible to dynamical
friction?: Most of giant molecular clouds (GMCs) in M 33 are connected with spiral-like
gaseous arms (filaments) with the exception of the inner 2 kpc region where the
link between the arms and GMCs disappears (see Tosaki et al. 2011). We check
whether... | astro-ph_GA |
Chemistry of massive young stellar objects with a disk-like structure: Our goal is to take an inventory of complex molecules in three well-known
high-mass protostars for which disks or toroids have been claimed and to study
the similarities and differences with a sample of massive YSOs without evidence
of such flattene... | astro-ph_GA |
Understanding the Structural Scaling Relations of Early-Type Galaxies: We use a large suite of hydrodynamical simulations of binary galaxy mergers
to construct and calibrate a physical prescription for computing the effective
radii and velocity dispersions of spheroids. We implement this prescription
within a semi-anal... | astro-ph_GA |
Discovery of two new hypervelocity stars from the LAMOST spectroscopic
surveys: We report the discovery of two new unbound hypervelocity stars (HVSs) from
the LAMOST spectroscopic surveys. They are respectively a B2V type star of ~ 7
M$_{\rm \odot}$ with a Galactic rest-frame radial velocity of 502 km/s at a
Galactoc... | astro-ph_GA |
Why Simple Stellar Population models do not reproduce the colours of
Galactic open clusters: (...) We search for an explanation of the disagreement between the observed
integrated colours of 650 local Galactic clusters and the theoretical colours
of present-day SSP models. We check the hypothesis that the systematic ... | astro-ph_GA |
The Initial Mass Function of the Orion Nebula Cluster across the
H-burning limit: We present a new census of the Orion Nebula Cluster (ONC) over a large field
of view (>30'x30'), significantly increasing the known population of stellar
and substellar cluster members with precisely determined properties. We develop
an... | astro-ph_GA |
Precision measurement of magnetic field from near to far, from fine to
large scales in ISM: Magnetic fields have important or dominant effects in many areas of
astrophysics, but have been very difficult to quantify. Spectropolarimetry from
Ground State Alignment (GSA) has been suggested as a direct tracer of magnetic... | astro-ph_GA |
The Influence of Orbital Eccentricity on Tidal Radii of Star Clusters: We have performed N-body simulations of star clusters orbiting in a
spherically symmetric smooth galactic potential. The model clusters cover a
range of initial half-mass radii and orbital eccentricities in order to test
the historical assumption th... | astro-ph_GA |
Photon and neutrino emission from active galactic nuclei: Supermassive black holes in the centers of galaxies are very common. They are
known to rotate, accrete, spin down and eject highly relativistic jets; those
jets pointed at us all seem to show a spectrum with two strong bumps, one in
the TeV photon range, and one... | astro-ph_GA |
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