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Herschel survey of brown dwarf disks in Rho Ophiuchi: Recent observations of the Rho Ophiuchi cluster with the Herschel Space
Observatory allow us to probe the spectral energy distribution (SED) of the
brown dwarf population in the far-IR, where the disk emission peaks. We
performed aperture photometry at 70, 100, and ... | astro-ph_GA |
Fuzzy dark matter dynamics in tidally perturbed dwarf spheroidal galaxy
satellites: Fuzzy dark matter (FDM) has dynamical properties that differ significantly
from cold dark matter (CDM). These dynamical differences are strongly
manifested on the spatial scale of dwarf spheroidal galaxies (dSphs), which
roughly corre... | astro-ph_GA |
Power-law models of totally anisotropic scattering: The interstellar scattering responsible for pulsar parabolic arcs, and for
intra-day variability of compact radio quasars, is highly anisotropic in some
cases. We numerically simulate these observed phenomena using totally
anisotropic, power-law models for the electro... | astro-ph_GA |
Effects of feedback on galaxies in the VELA simulations: elongation,
clumps and compaction: The evolution of star-forming galaxies at high redshifts is very sensitive to
the strength and nature of stellar feedback. Using two sets of cosmological,
zoom-in simulations from the VELA suite, we compare the effects of two
... | astro-ph_GA |
Is there a relationship between AGN and star formation in IR-bright
AGNs?: We report the relationship between the luminosities of active galactic nuclei
(AGNs) and the rates of star formation (SF) for a sample of 323 far-infrared
(FIR)-detected AGNs. This sample has a redshift range of 0.2 $< z <$ 2.5, and
spans thre... | astro-ph_GA |
CHANG-ES XIII: Transport processes and the magnetic fields of NGC 4666 -
indication of a reversing disk magnetic field: We analyze the magnetic field geometry and the transport processes of the
cosmic rays of the edge-on spiral starburst galaxy NGC 4666 from CHANG-ES radio
continuum data in two frequencies; 6 GHz (C-... | astro-ph_GA |
ALMA reveals sequential high-mass star formation in the G9.62+0.19
complex: Stellar feedback from high-mass stars (e.g., H{\sc ii} regions) can strongly
influence the surrounding interstellar medium and regulate star formation. Our
new ALMA observations reveal sequential high-mass star formation taking place
within o... | astro-ph_GA |
The galaxy counterpart of the high-metallicity and 16 kpc impact
parameter DLA towards Q0918+1636 - a challenge to galaxy formation models?: The quasar Q0918+1636 (z=3.07) has an intervening high-metallicity Damped
Lyman-alpha Absorber (DLA) along the line of sight, at a redshift of z=2.58.
The DLA is located at a la... | astro-ph_GA |
Stripped elliptical galaxies as probes of ICM physics: II. Stirred, but
mixed? Viscous and inviscid gas stripping of the Virgo elliptical M89: Elliptical galaxies moving through the intra-cluster medium (ICM) are
progressively stripped of their gaseous atmospheres. X-ray observations reveal
the structure of galactic ... | astro-ph_GA |
The Dragon-II simulations -- II. Formation mechanisms, mass, and spin of
intermediate-mass black holes in star clusters with up to 1 million stars: The processes that govern the formation of intermediate-mass black holes
(IMBHs) in dense stellar clusters are still unclear. Here, we discuss the role
of stellar mergers... | astro-ph_GA |
Probing the origin of the two-component structure of broad line region
by reverberation mapping of an extremely variable quasar: The physical origins of quasar components, such as the broad line region
(BLR) and dust torus, remain under debate. To gain insights into them, we
focused on Changing-State Quasars (CSQs) w... | astro-ph_GA |
Unraveling the Complex Structure of AGN-driven Outflows. VI. Strong
Ionized Outflows in Type 1 AGNs and the Outflow Size-Luminosity Relation: We present spatially resolved gas kinematics, ionization, and energetics of
11 type 1 and 5 type 2 active galactic nuclei (AGNs) with strong ionized gas
outflows at z $<0.3$ us... | astro-ph_GA |
MAHALO Deep Cluster Survey II. Characterizing massive forming galaxies
in the Spiderweb protocluster at z=2.2: This paper is the second in a series presenting the results of our deep
H$\alpha$-line survey towards protoclusters at $z>2$, based on narrow-band
imaging with the Subaru Telescope. This work investigates ma... | astro-ph_GA |
Molecular Emission from a Galaxy Associated with a z~2.2 Damped
Lyman-alpha Absorber: Using the Atacama Large Millimeter/sub-millimeter Array, we have detected
CO(3-2) line and far-infrared continuum emission from a galaxy associated with
a high-metallicity ([M/H] = -0.27) damped Ly-alpha absorber (DLA) at z
=2.19289... | astro-ph_GA |
Where stars form: inside-out growth and coherent star formation from HST
Halpha maps of 2676 galaxies across the main sequence at z~1: We present Ha maps at 1kpc spatial resolution for star-forming galaxies at
z~1, made possible by the WFC3 grism on HST. Employing this capability over all
five 3D-HST/CANDELS fields p... | astro-ph_GA |
The Vista Variables in the Via Lactea (VVV) ESO Public Survey: Current
Status and First Results: Vista Variables in the Via Lactea (VVV) is an ESO Public Survey that is
performing a variability survey of the Galactic bulge and part of the inner
disk using ESO's Visible and Infrared Survey Telescope for Astronomy (VIS... | astro-ph_GA |
Clues on the Missing Sources of Reionization from Self-consistent
Modeling of Milky Way and Dwarf Galaxy Globular Clusters: Globular clusters are unique tracers of ancient star formation. We determine
the formation efficiencies of globular clusters across cosmic time by modeling
the formation and dynamical evolution ... | astro-ph_GA |
A massive mess: When a large dwarf and a Milky Way-like galaxy merge: Circa 10 billion years ago the Milky Way merged with a massive satellite,
Gaia-Enceladus. To gain insight into the properties of its debris we analyse in
detail the suite of simulations from Villalobos & Helmi (2008), which includes
an experiment tha... | astro-ph_GA |
Correlations of gas, dust and young stellar populations in the spiral
galaxy NGC 7331: Molecular clouds (MCs) in galaxies are complex places with many phases. It
is, therefore, essential to study the physics and kinematics of the MCs using
multiple emission lines. We probe the physics of the molecular gas and dust in... | astro-ph_GA |
Kinematics of the Atomic ISM in M33 on 80 pc scales: We present new L-band ($1\mbox{--}2$ GHz) observations of the nearby spiral
galaxy M33 with 80 pc resolution obtained with the Karl G. Jansky Very Large
Array. The HI observations, combined with HI measurements from the Green Bank
Telescope, improve the spectral reso... | astro-ph_GA |
A 2-3 mm high-resolution molecular line survey towards the centre of the
nearby spiral galaxy NGC 6946: The complex physical, kinematic, and chemical properties of galaxy centres
make them interesting environments to examine with molecular line emission. We
present new $2-4$" (${\sim}75{-}150$ pc at $7.7$ Mpc) observ... | astro-ph_GA |
Is a recently discovered HI cloud near M94 a starless dark matter halo?: Observations with the Five-Hundred-Meter Aperture Spherical Telescope have
revealed the presence of a marginally-resolved source of 21 cm emission from a
location $\sim50'$ from the M94 galaxy, without a stellar counterpart down to
the surface bri... | astro-ph_GA |
The Galaxy in Context: Structural, Kinematic and Integrated Properties: Our Galaxy, the Milky Way, is a benchmark for understanding disk galaxies. It
is the only galaxy whose formation history can be studied using the full
distribution of stars from white dwarfs to supergiants. The oldest components
provide us with uni... | astro-ph_GA |
A Uniformly Selected, Southern-Sky 6dF, Optical AGN Catalog: We have constructed a catalog of active galactic nuclei (AGNs) with $z <
0.13$, based on optical spectroscopy, from the parent sample of galaxies in the
6dF galaxy survey (Final Release of 6dFGS), a census of the Southern
hemisphere. This work is an extension... | astro-ph_GA |
Effects of baryonic and dark matter substructure on the Pal 5 stream: Gravitational encounters between small-scale dark matter substructure and
cold stellar streams in the Milky Way halo lead to density perturbations in the
latter, making streams an effective probe for detecting dark matter
substructure. The Pal 5 stre... | astro-ph_GA |
Probing $z \gtrsim 6$ massive black holes with gravitational waves: We investigate the coalescence of massive black hole ($M_{\rm BH}\gtrsim
10^{6}~\rm M_{\odot}$) binaries (MBHBs) at $6<z<10$ by adopting a suite of
cosmological hydrodynamical simulations of galaxy formation, zoomed-in on
biased ($ >3 \sigma$) overdens... | astro-ph_GA |
The impact of black hole feedback on the UV luminosity and stellar mass
assembly of high-redshift galaxies: We employ the Delphi semi-analytical model to study the impact of black hole
growth on high-redshift galaxies, both in terms of the observed UV luminosity
and of the star formation rate. To do this, firstly, we... | astro-ph_GA |
Restoration of the Tully-Fisher Relation by Statistical Rectification: I employ the Lucy rectification algorithm to recover the
inclination-corrected distribution of local disk galaxies in the plane of
absolute magnitude ($M_i$) and HI velocity width ($W_{20}$). By considering the
inclination angle as a random variable... | astro-ph_GA |
Magnetized Kelvin-Helmholtz instability in the presence of a radiation
field: The purpose of this study is to analyze the dynamical role of a radiation
field on the growth rate of the unstable Kelvin - Helmholtz (KH) perturbations.
As a first step toward this purpose, the analyze is done in a general way,
irrespectiv... | astro-ph_GA |
A 10,000 Years Old Explosion in DR21: Sensitive high angular resolution ($\sim$ 2$"$) CO(2-1) line observations
made with the Submillimeter Array (SMA) of the flow emanating from the
high-mass star forming region DR21 located in the Cygnus X molecular cloud are
presented. These new interferometric observations indicate... | astro-ph_GA |
Constraints on Spin of a Supermassive Black Hole in Quasars with Big
Blue Bump: We determined the spin value of supermassive black hole (SMBH) in active
galactic nuclei (AGN) with investigated ultraviolet-to-optical spectral energy
distribution, presented in the sample of Shang et al. (2005). The estimates of
the spi... | astro-ph_GA |
$Ω_{\rm bar}$ in NGC 5597 from VLA HI 21 cm Observations: We report Very Large Array B-configuration observations of the atomic
hydrogen 21 cm line emission from the barred disk galaxy NGC 5597 at an angular
resolution of 7.1" x 4.2". Using the resonance method, and assuming the ratio
of the corotation radius to the se... | astro-ph_GA |
Hidden giants in JWST's PEARLS: An ultra-massive z=4.26 sub-millimeter
galaxy that is invisible to HST: We present a multi-wavelength analysis using SMA, JCMT, NOEMA, JWST, HST, and
SST of two dusty strongly star-forming galaxies, 850.1 and 850.2, seen through
the massive cluster lens A1489. These SMA-located sources... | astro-ph_GA |
The better half -- Asymmetric star-formation due to ram pressure in the
EAGLE simulations: We use the EAGLE simulations to study the effects of the intra-cluster medium
(ICM) on the spatially resolved star-formation activity in galaxies. We study
three cases of galaxy asymmetry dividing each galaxy in two halves usin... | astro-ph_GA |
The TREX Survey: Kinematical Complexity Throughout M33's Stellar Disk
and Evidence for a Stellar Halo: We present initial results from a large spectroscopic survey of stars
throughout M33's stellar disk. We analyze a sample of 1667 red giant branch
(RGB) stars extending to projected distances of $\sim 11$ kpc from M3... | astro-ph_GA |
CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect
on molecular gas density and star formation in the barred spiral galaxy NGC
4303: We present the results of $^{12}$CO($J$=1-0) and $^{13}$CO($J$=1-0)
simultaneous mappings toward the nearby barred spiral galaxy NGC 4303 as a part
of the CO Mul... | astro-ph_GA |
Photometric and kinematical analysis of Koposov 12 and Koposov 43 open
clusters: We present a photometric and kinematical analysis of two and poorly studied
open clusters; Koposov 12 (FSR 802) and Koposov 43 (FSR 848) by using
cross-matched data from PPMXL and Gaia DR2 catalog. We use astrometric
parameters to identi... | astro-ph_GA |
Observations contradict galaxy size and surface brightness predictions
that are based on the expanding universe hypothesis: In a non-expanding universe surface brightness is independent of distance or
redshift, while in an expanding universe it decreases rapidly with both.
Similarly, for objects of the same luminosit... | astro-ph_GA |
Semi-Supervised Domain Adaptation for Cross-Survey Galaxy Morphology
Classification and Anomaly Detection: In the era of big astronomical surveys, our ability to leverage artificial
intelligence algorithms simultaneously for multiple datasets will open new
avenues for scientific discovery. Unfortunately, simply train... | astro-ph_GA |
Near-infrared spectroscopy of 5 ultra-massive galaxies at 1.7 < z < 2.7: We present the results of a pilot near-infrared (NIR) spectroscopic campaign
of five very massive galaxies ($\log(\text{M}_\star/\text{M}_\odot)>11.45$) in
the range of $1.7<z<2.7$. We measure an absorption feature redshift for one
galaxy at $z_\t... | astro-ph_GA |
X-ray and radio variability in the low luminosity Active Galactic
Nucleus NGC 7213: We present the results of a ~ 3 year campaign to monitor the low luminosity
active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and
X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10^-4
L_Edd, ... | astro-ph_GA |
On the dark matter haloes inner structure and galaxy morphology: In the present paper, we extend the study of Del Popolo (2010) to determine
the slope of the inner density profile of galaxy haloes with different
morphologies. We study how galaxy morphology changes the relation between the
inner slope of the galaxy halo... | astro-ph_GA |
Accretion onto disk galaxies via hot and rotating CGM inflows: Observed accretion rates onto the Milky-Way and other local spirals fall
short of that required to sustain star formation for cosmological timescales. A
potential avenue for this unseen accretion is an inflow in the volume-filling
hot phase ($\sim10^6$ K) o... | astro-ph_GA |
Gas fractions and depletion times in galaxies with different degrees of
interaction: We study the atomic gas content and the central stellar mass concentration
for a sample of almost 1500 nearby galaxies to investigate the nature of
starbursts and the influence of galaxy-galaxy interactions on star formation
(SF). We... | astro-ph_GA |
Towards a complete stellar mass function of the Hyades. I. Pan-STARRS1
optical observations of the low-mass stellar content: The Hyades cluster is an ideal target to study the dynamical evolution of a
star cluster over the entire mass range due to its intermediate age and
proximity to the Sun. We wanted to extend the... | astro-ph_GA |
Physical Model of Dust Polarization by Radiative Torque Alignment and
Disruption and Implications for Grain Internal Structures: Dust polarization depends on the physical and mechanical properties of dust,
as well as the properties of local environments. To understand how dust
polarization varies with grain mechanica... | astro-ph_GA |
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). V. Deep
450 Micron Imaging: We present deep SCUBA-2 450 micron imaging of the two GOODS fields, achieving
a central rms of 1.14 mJy for the GOODS-N and 1.86 mJy for the GOODS-S. For
each field, we give a catalog of >4-sigma detections (79 and 16 sources,
... | astro-ph_GA |
A new strong-lensing galaxy at z=0.066: Another elliptical galaxy with a
lightweight IMF: We report the discovery of a new low-redshift galaxy-scale gravitational
lens, identified from a systematic search of publicly available MUSE
observations. The lens galaxy, 2MASXJ04035024-0239275, is a giant elliptical at
$z$ = ... | astro-ph_GA |
Spectrophotometric Redshifts In The Faint Infrared Grism Survey: Finding
Overdensities Of Faint Galaxies: We improve the accuracy of photometric redshifts by including low-resolution
spectral data from the G102 grism on the Hubble Space Telescope, which assists
in redshift determination by further constraining the sh... | astro-ph_GA |
Physical Properties of Massive Compact Starburst Galaxies with Extreme
Outflows: We present results on the nature of extreme ejective feedback episodes and
the physical conditions of a population of massive ($\rm M_* \sim 10^{11}
M_{\odot}$), compact starburst galaxies at z = 0.4-0.7. We use data from
Keck/NIRSPEC, S... | astro-ph_GA |
The Effect of Many Minor Mergers on the Size Growth of Compact Quiescent
Galaxies: Massive galaxies with a half-mass radius <~ 1kpc are observed in the early
universe (z~>2), but not in the local universe. In the local universe
similar-mass (within a factor of two) galaxies tend to be a factor of 4 to 5
larger. Dry m... | astro-ph_GA |
The Abell 85 BCG: a nucleated, core-less galaxy: New high-resolution r band imaging of the brightest cluster galaxy (BCG) in
Abell 85 (Holm 15A) was obtained using the Gemini Multi Object Spectrograph.
These data were taken with the aim of deriving an accurate surface brightness
profile of the BCG of Abell 85, in parti... | astro-ph_GA |
Resolved neutral carbon emission in nearby galaxies: [CI] Lines as Total
Molecular Gas Tracers: We present maps of atomic carbon [CI](1-0) and [CI](2-1) at a linear
resolution ~1kpc scale for a sample of one HII, six LINER, three Seyfert and
five starburst galaxies observed with Herschel. We compare spatial
distribut... | astro-ph_GA |
The Impact of an AGN on PAH Emission in Galaxies: the Case of Ring
Galaxy NGC 4138: We present a focused study of radially-resolved varying PAH emission in the
low-luminosity AGN-host NGC 4138 using deep Spitzer/IRS spectral maps. Using
new model PAH spectra, we investigate whether these variations could be
associate... | astro-ph_GA |
Green Bank Telescope Observations of ${\bf ^3He^{\bf +}}$: Planetary
Nebulae: We use the Green Bank Telescope to search for $^3He^+$ emission from a sample
of four Galactic planetary nebulae: NGC 3242, NGC 6543, NGC 6826, and NGC 7009.
During the era of primordial nucleosynthesis the light elements $^2H$, $^3He$,
$^4... | astro-ph_GA |
Realistic galaxy images and improved robustness in machine learning
tasks from generative modelling: We examine the capability of generative models to produce realistic galaxy
images. We show that mixing generated data with the original data improves the
robustness in downstream machine learning tasks. We focus on th... | astro-ph_GA |
Boron Abundances in Diffuse Interstellar Clouds: We present a comprehensive survey of B abundances in diffuse interstellar
clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is
the result of a complete search of archival STIS data for the B II resonance
line at 1362 angstroms, with each detecti... | astro-ph_GA |
Ultraviolet and optical view of galaxies in the Coma Supercluster: The Coma supercluster (100 Mpc) offers an unprecedented contiguous range of
environments in the nearby Universe. In this paper we present a catalogue of
spectroscopically confirmed galaxies in the Coma supercluster detected in the
ultraviolet (UV) waveb... | astro-ph_GA |
Water vapour masers in long-period variable stars II. The semi-regular
variables R Crt and RT Vir: Within the 'Medicina/Effelsberg H2O maser monitoring program' we have
observed the maser emission of R Crt and RT Vir for more than two decades. To
get insight in the distribution and longevity of maser spots in the
cir... | astro-ph_GA |
NGC 1261: an $r$-process enhanced globular cluster from the
Gaia-Enceladus event: Our Milky Way (MW) has witnessed a series of major accretion events. One of
the later additions, Gaia-Enceladus, has contributed a considerable mass to the
inner Galaxy, but also generously donated to the outer halo. So far,
association... | astro-ph_GA |
Stellar Black Hole Binary Mergers in Open Clusters: In this paper we study the evolution of a primordial black hole binary (BHB)
in a sample of over 1500 direct-summation $N-$body simulations of small-and
intermediate-size isolated star clusters as proxies of galactic open clusters.
The BHBs have masses in the range of... | astro-ph_GA |
The Sheet of Giants: Unusual Properties of the Milky Way's Immediate
Neighbourhood: We quantify the shape and overdensity of the galaxy distribution in the
`Local Sheet' within a sphere of $R=8$ Mpc, and compare these properties with
the expectations of the $\Lambda$CDM model. We measure ellipsoidal axis ratios
of $c... | astro-ph_GA |
Nuclear regions as seen with LOFAR international baselines: A
high-resolution study of the recurrent activity: Radio galaxies dominate the radio sky and are essential to the galaxy
evolution puzzle. High-resolution studies of statistical samples of radio
galaxies are expected to shed light on the triggering mechanism... | astro-ph_GA |
Quantifying the suppression of the (un)-obscured star formation in
galaxy cluster cores at 0.2$\lesssim$$z$$\lesssim$0.9: We quantify the star formation (SF) in the inner cores
($\mathcal{R}$/$R_{200}$$\leq$0.3) of 24 massive galaxy clusters at
0.2$\lesssim$$z$$\lesssim$0.9 observed by the $Herschel$ Lensing Survey a... | astro-ph_GA |
A galactic-scale origin for stellar clustering: We recently presented a model for the cluster formation efficiency (CFE),
i.e. the fraction of star formation occurring in bound stellar clusters. It
utilizes the idea that the formation of stars and stellar clusters occurs
across a continuous spectrum of ISM densities. B... | astro-ph_GA |
One, Two, Three ... An Explosive Outflow in IRAS 12326$-$6245 revealed
by ALMA: In the last years there has been a substantial increase in the number of the
reported massive and luminous star-forming regions with related explosive
outflows thanks to the superb sensitivity and angular resolution provided by
the new ra... | astro-ph_GA |
The nature of the Milky Way's stellar halo revealed by the three
integrals of motion: We developed a new selection method of halo stars in the phase-space
distribution defined by the three integrals of motion in an axisymmetric
Galactic potential, ($E$, $L_z$, $I_3$), where $I_3$ is the third integral of
motion. The ... | astro-ph_GA |
Photoionization Modelling of the Giant Broad-Line Region in NGC 3998: Prior high angular resolution spectroscopic observations of the
Low-ionization nuclear emission-line region (Liner) in NGC 3998 obtained with
the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space
Telescope (HST) revealed a rich UV-v... | astro-ph_GA |
Molecular-Cloud-Scale Chemical Composition III: Constraints of Average
Physical Properties through Chemical Models: It is important to understand the origin of molecular line intensities and
chemical composition in the molecular-cloud scale in the Galactic sources
because it serves as a benchmark to compare with the ... | astro-ph_GA |
Spontaneous Formation of Outflows Powered by Rotating Magnetized
Accretion Flows in a Galactic Center: We investigate how magnetically driven outflows are powered by a rotating,
weakly magnetized accretion flow onto a supermassive black hole using
axisymmetric magnetohydrodynamic simulations. Our proposed model focus... | astro-ph_GA |
Simulations of the star-forming molecular gas in an interacting M51-like
galaxy: cloud population statistics: To investigate how molecular clouds react to different environmental
conditions at a galactic scale, we present a catalogue of giant molecular
clouds resolved down to masses of $\sim 10$~M$_{\odot}$ from a si... | astro-ph_GA |
The nature of sub-millimetre galaxies II: an ALMA comparison of SMG dust
heating mechanisms: We compare the contribution of Active Galactic Nuclei (AGN) and
star-formation towards dust heating in sub-mm galaxies (SMGs). We have used
ALMA at $0."1$ resolution to image a complete flux-limited sample of seven
sub-mm sou... | astro-ph_GA |
Subaru FOCAS IFU observations of two z=0.12 strong-lensing elliptical
galaxies from SDSS MaNGA: We present new observations of two z=0.12 strong-lensing elliptical galaxies,
originally discovered from the SDSS-IV MaNGA survey, using the new FOCAS IFU
spectrograph on the Subaru Telescope. For J1436+4943, our observati... | astro-ph_GA |
The Black Hole in the Compact, High-dispersion Galaxy NGC 1271: Located in the Perseus cluster, NGC 1271 is an early-type galaxy with a small
effective radius of 2.2 kpc and a large stellar velocity dispersion of 276 km/s
for its K-band luminosity of 8.9x10^{10} L_sun. We present a mass measurement
for the black hole i... | astro-ph_GA |
A Catalog of Globular Cluster Systems: What Determines the Size of a
Galaxy's Globular Cluster Population?: We present a catalog of 422 galaxies with published measurements of their
globular cluster (GC) populations. Of these, 248 are E galaxies, 93 are S0
galaxies, and 81 are spirals or irregulars. Among various cor... | 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 |
Identification of filamentary structures in the environment of
superclusters of galaxies in the Local Universe: The characterization of the internal structure of the superclusters of
galaxies (walls, filaments and knots where the clusters are located) is
paramount for understanding the formation of the Large Scale St... | astro-ph_GA |
Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy
Reticulum II: We present Magellan/M2FS, VLT/GIRAFFE, and Gemini South/GMOS spectroscopy of
the newly discovered Milky Way satellite Reticulum II. Based on the spectra of
25 Ret II member stars selected from Dark Energy Survey imaging, we measure a
m... | astro-ph_GA |
Large scale clustering measurements with photometric redshifts:
comparing the dark matter halos of X-ray AGN, star-forming and passive
galaxies at z~1: We combine multiwavelength data in the AEGIS-XD and C-COSMOS surveys to
measure the typical dark matter halo mass of X-ray selected AGN
[Lx(2-10keV)>1e42 erg/s] in ... | astro-ph_GA |
New halo stars of the Galactic globular clusters M3 and M13 in the
LAMOST DR1 Catalog: M3 and M13 are Galactic globular clusters with previous reports of
surrounding stellar halos. We present the results of a search for members and
extratidal cluster halo stars within and outside of the tidal radius of these
clusters... | astro-ph_GA |
The formation of Milky Way-mass disk galaxies in the first 500 million
years of a cold dark matter universe: Whether among the myriad tiny proto-galaxies there exists a population with
similarities to present day galaxies is an open question. We show, using
BlueTides, the first hydrodynamic simulation large enough to... | astro-ph_GA |
Magnetic fields in the infrared dark cloud G34.43+0.24: We present the B-fields mapped in IRDC G34.43+0.24 using 850\,$\mu$m
polarized dust emission observed with the POL-2 instrument at JCMT. We examine
the magnetic field geometries and strengths in the northern, central, and
southern regions of the filament. The over... | astro-ph_GA |
The radial gradient of cosmic ray intensity in the Galaxy: The dependence of the cosmic ray intensity on Galactocentric distance is
known to be much less rapid than that to be thought-to-be sources: supernova
remnants. This is an old problem ('the radial gradient problem') which has led
to a number of possible 'scenari... | astro-ph_GA |
On the quenching of star formation in observed and simulated central
galaxies: Evidence for the role of integrated AGN feedback: In this paper we investigate how massive central galaxies cease their star
formation by comparing theoretical predictions from cosmological simulations:
EAGLE, Illustris and IllustrisTNG wi... | astro-ph_GA |
Empirical derivation of the metallicity evolution with time and radius
using TNG50 Milky Way/Andromeda analogues: Recent works have used a linear birth metallicity gradient to estimate the
evolution of the [Fe/H] profile in the Galactic disk over time, and infer
stellar birth radii (R$_\text{birth}$) from [Fe/H] and ... | astro-ph_GA |
Magnetic and gaseous spiral arms in M83: Isotropic and anisotropic wavelet transforms are used to decompose the images
of the spiral galaxy M83 in various tracers to quantify structures in a range
of scales from 0.2 to 10 kpc. We used radio polarization observations at
{\lambda}6 cm and 13 cm obtained with the VLA, Eff... | astro-ph_GA |
Optical Identification and Spectroscopy of Supernova Remnants in the
Galaxy M51: Using a combination of ground-based and HST imaging, we have constructed a
catalog of 179 supernova remnants (SNRs) and SNR candidates in the nearby
spiral galaxy M51. Follow-up spectroscopy of 66 of the candidates confirms 61
of these a... | astro-ph_GA |
Strongly lensed candidates from the HSC transient survey: We present a lensed quasar search based on the variability of lens systems in
the HSC transient survey. Starting from 101,353 variable objects with i-band
photometry in the HSC transient survey, we used a variability-based lens search
method measuring the spatia... | astro-ph_GA |
The extreme luminosity states of Sagittarius A*: We discuss mm-wavelength radio, 2.2-11.8um NIR and 2-10 keV X-ray light
curves of the super massive black hole (SMBH) counterpart of Sagittarius A*
(SgrA*) near its lowest and highest observed luminosity states. The luminosity
during the low state can be interpreted as s... | astro-ph_GA |
The Three Hundred: $M_{sub}-V_{circ}$ relation: In this study, we investigate a recent finding based on strong lensing
observations, which suggests that the sub-halos observed in clusters exhibit
greater compactness compared to those predicted by $\Lambda$CDM simulations. To
address this discrepancy, we performed a com... | astro-ph_GA |
The Origin of the 300 km s$^{-1}$ Stream Near Segue 1: We present a search for new members of the 300 km s$^{-1}$ stream (300S) near
the dwarf galaxy Segue 1 using wide-field survey data. We identify 11
previously unknown bright stream members in the APOGEE-2 and SEGUE-1 and 2
spectroscopic surveys. Based on the spatia... | astro-ph_GA |
Can X-rays provide a solution to the abundance discrepancy problem in
photoionised nebulae?: We re-examine the well-known discrepancy between ionic abundances determined
via the analysis of recombination lines (RLs) and collisionally excited lines
(CELs). We show that abundance variations can be mimicked in a {\it ch... | astro-ph_GA |
A catalogue of 74 new open clusters found in Gaia Data-Release 2: Based on astrometric data from Gaia DR2, we employ an unsupervised machine
learning method to blindly search for open star clusters in the Milky Way
within the Galactic latitude range of |b| < 20 degrees. In addition to 2,080
known clusters, 74 new open ... | astro-ph_GA |
Radiation pressure acting on the neutral He atoms in the Heliosphere: The Interstellar Neutral Helium (ISN He) is an important source of
information on the physical state of the Local Interstellar Medium. Radiation
pressure acting on the neutral helium atoms in the heliosphere has always been
neglected, its effect has ... | astro-ph_GA |
Are rotating planes of satellite galaxies ubiquitous?: We compare the dynamics of satellite galaxies in the Sloan Digital Sky Survey
to simple models in order to test the hypothesis that a large fraction of
satellites co-rotate in coherent planes. We confirm the previously-reported
excess of co-rotating satellite pairs... | astro-ph_GA |
Predicting resolved galaxy properties from photometric images using
convolutional neural networks: Multi-band images of galaxies reveal a huge amount of information about their
morphology and structure. However, inferring properties of the underlying
stellar populations such as age, metallicity or kinematics from tho... | astro-ph_GA |
First laboratory detection of vibration-rotation transitions of CH$^+$
and $^{13}$CH$^+$ and improved measurement of their rotational transition
frequencies: The long-searched C-H stretches of the fundamental ions CH$^+$ and
$^{13}$CH$^+$ have been observed for the first time in the laboratory. For
this, the state-... | astro-ph_GA |
Fossil group origins X. Velocity segregation in fossil systems: We want to study how the velocity segregation and the radial profile of the
velocity dispersion depend on the prominence of the brightest cluster galaxies
(BCGs). We divide a sample of 102 clusters and groups of galaxies into four
bins of magnitude gap bet... | astro-ph_GA |
High-Dimensional Dust Mapping: Galactic interstellar dust has a profound impact not only on our observations
of objects throughout the Universe, but also on the morphology, star formation,
and chemical evolution of the Galaxy. The advent of massive imaging and
spectroscopic surveys (particularly in the infrared) places... | astro-ph_GA |
Formation of Dark Matter Torii Around Supermassive Black Holes Via The
Eccentric Kozai-Lidov Mechanism: We explore the effects of long term secular perturbations on the distribution
of dark matter particles around Supermassive Black Hole (BH) binaries. We show
that in the hierarchical (in separation) three-body probl... | astro-ph_GA |
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