Showing 2021 · astro-ph.GAShow all

22 papers · 2 filters

astro-ph.GA2021

Predictions for the X-ray circumgalactic medium of edge-on discs and spheroids

Anna Nica, Benjamin D. Oppenheimer, Robert A. Crain +5

We investigate how the X-ray circumgalactic medium (CGM) of present-day galaxies depends on galaxy morphology and azimuthal angle using mock observations generated from the EAGLE c…

astro-ph.GA2021★ 90 cited

ATLASGAL -- Evolutionary trends in high-mass star formation

J. S. Urquhart, M. R. A. Wells, T. Pillai +13

ATLASGAL is a 870-mircon dust survey of 420 square degrees of the inner Galactic plane and has been used to identify ~10 000 dense molecular clumps. Dedicated follow-up observation…

astro-ph.GA2021★ 31 cited

The deepest view of RBS 797: evidence for two pairs of equidistant X-ray cavities

Francesco Ubertosi, Myriam Gitti, Fabrizio Brighenti +14

We present the first results of a deep observation of the galaxy cluster RBS 797, whose previous X-ray studies revealed two pronounced X-ray cavities in the east-west (E-…

astro-ph.GA2021★ 139 cited

Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

Michael Janssen, Heino Falcke, Matthias Kadler +236

Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimeter wavelengths have the power to reveal the launching and initial collimation region of e…

astro-ph.GA2021★ 4 cited

Discovery of a New Population of Galactic HII Regions with Ionized Gas Velocity Gradients

Dana S. Balser, Trey V. Wenger, L. D. Anderson +4

We investigate the kinematic properties of Galactic HII regions using radio recombination line (RRL) emission detected by the Australia Telescope Compact Array (ATCA) at 4-10 GHz a…

astro-ph.GA2021★ 15 cited

Physical conditions in the warped accretion disk of a massive star. 349 GHz ALMA observations of G023.0100.41

A. Sanna, A. Giannetti, M. Bonfand +7

Young massive stars warm up the large amount of gas and dust which condenses in their vicinity, exciting a forest of lines from different molecular species. Their line brightness i…

astro-ph.GA2021★ 20 cited

A global view on star formation: The GLOSTAR Galactic plane survey IV. Radio continuum detections of young stellar objects in the Galactic Centre region

H. Nguyen, M. R. Rugel, K. M. Menten +19

The Central Molecular Zone (CMZ), a 200 pc sized region around the Galactic Centre, is peculiar in that it shows a star formation rate (SFR) that is suppressed with respect t…

astro-ph.GA2021★ 5 cited

Discovery of 22 GHz Water Masers in the Serpens South Region

Gisela N. Ortiz-León, Adele Plunkett, Laurent Loinard +5

Using the Karl G. Jansky Very Large Array (VLA), we have conducted a survey for 22 GHz, 6_{1,6}-5_{2,3} H2O masers toward the Serpens South region. The masers were also observed wi…

astro-ph.GA2021★ 20 cited

A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster

Shanghuo Li, Xing Lu, Qizhou Zhang +24

Pre-stellar cores represent the initial conditions of star formation. Although these initial conditions in nearby low-mass star-forming regions have been investigated in detail, su…

astro-ph.GA2021★ 20 cited

The Southern HII Region Discovery Survey. II. The Full Catalog

Trey V. Wenger, J. R. Dawson, John M. Dickey +6

The Southern HII Region Discovery Survey (SHRDS) is a 900 hour Australia Telescope Compact Array 4-10 GHz radio continuum and radio recombination line (RRL) survey of Galactic HII…

astro-ph.GA2021★ 26 cited

The GBT Diffuse Ionized Gas Survey (GDIGS): Survey Overview and First Data Release

L. D. Anderson, Matteo Luisi, Bin Liu +6

The Green Bank Telescope (GBT) Diffuse Ionized Gas Survey (GDIGS) traces ionized gas in the Galactic midplane by measuring GHz radio recombination line (RRL) emission. The nom…

astro-ph.GA2021★ 6 cited

High-resolution CARMA Observation of Molecular Gas in the North America and Pelican Nebulae

Shuo Kong, Héctor G. Arce, John M. Carpenter +15

We present the first results from a CARMA high-resolution CO(1-0), CO(1-0), and CO(1-0) molecular line survey of the North America and Pelican (NAP) Nebulae. C…

astro-ph.GA2021★ 10 cited

Magnetic fields and Star Formation around HII regions: The S235 complex

R. Devaraj, D. P. Clemens, L. K. Dewangan +3

Magnetic fields are ubiquitous and essential in star formation. In particular, their role in regulating formation of stars across diverse environments like HII regions needs to be…

astro-ph.GA2021

A VLA Census of the Galactic H II Region Population

William P. Armentrout, Loren D. Anderson, Trey V. Wenger +2

The Milky Way contains thousands of H II region candidates identified by their characteristic mid-infrared morphology, but lacking detections of ionized gas tracers such as radio c…

astro-ph.GA2021★ 23 cited

The Core Mass Function in the Orion Nebula Cluster Region: What Determines the Final Stellar Masses?

Hideaki Takemura, Fumitaka Nakamura, Shuo Kong +29

Applying dendrogram analysis to the CARMA-NRO CO (=1--0) data having an angular resolution of 8", we identified 692 dense cores in the Orion Nebula Cluster (ONC) r…

astro-ph.GA2021★ 26 cited

Compact Starburst Galaxies with Fast Outflows: Central Escape Velocities and Stellar Mass Surface Densities from Multi-band Hubble Space Telescope Imaging

Aleksandar M. Diamond-Stanic, John Moustakas, Paul H. Sell +20

We present multi-band Hubble Space Telescope imaging that spans rest-frame near-ultraviolet through near-infrared wavelengths (0.3-1.1 m) for 12 compact starburst galaxies at z=…

astro-ph.GA2021★ 10 cited

The Galactic HII Region Luminosity Function at Radio and Infrared Wavelengths

J. L. Mascoop, L. D. Anderson, Trey. V. Wenger +4

The Galactic HII region luminosity function (LF) is an important metric for understanding global star formation properties of the Milky Way, but only a few studies have been done a…

astro-ph.GA2021★ 21 cited

ATLASGAL -- selected massive clumps in the inner Galaxy. IX. Deuteration of ammonia

M. Wienen, F. Wyrowski, C. M. Walmsley +4

Deuteration has been used as a tracer of the evolutionary phases of low- and high-mass star formation. The APEX Telescope Large Area Survey (ATLASGAL) provides an important reposit…

astro-ph.GA2021★ 39 cited

Star formation in 'the Brick': ALMA reveals an active proto-cluster in the Galactic centre cloud G0.253+0.016

Daniel L. Walker, Steven N. Longmore, John Bally +16

G0.253+0.016, aka 'the Brick', is one of the most massive (> 10^5 Msun) and dense (> 10^4 cm-3) molecular clouds in the Milky Way's Central Molecular Zone. Previous observations ha…

astro-ph.GA2021★ 37 cited

HII regions and high-mass starless clump candidates II. Fragmentation and induced star formation at ~0.025 pc scale: An ALMA continuum study

S. Zhang, A. Zavagno, A. López-Sepulcre +7

The ionization feedback from HII regions modifies the properties of high-mass starless clumps (HMSCs, of several hundred to a few thousand solar masses with a size of ~0.1-1 pc), s…

astro-ph.GA2021★ 37 cited

ALMA Observations of Massive Clouds in the Central Molecular Zone: Ubiquitous Protostellar Outflows

Xing Lu, Shanghuo Li, Adam Ginsburg +11

We observe 1.3~mm spectral lines at 2000~AU resolution toward four massive molecular clouds in the Central Molecular Zone of the Galaxy to investigate their star formation activiti…

astro-ph.GA2021★ 19 cited

VLA resolves unexpected radio structures in the Perseus cluster of galaxies

Marie-Lou Gendron-Marsolais, Charles L. H. Hull, Rick Perley +10

We present new deep, high-resolution, 1.5 GHz observations of the prototypical nearby Perseus galaxy cluster from the Karl G. Jansky Very Large Array. We isolate for the first time…