Showing 2020 · astro-ph.GAShow all

87 papers · 2 filters

astro-ph.GA2020★ 50 cited

Prospects for Galactic and stellar astrophysics with asteroseismology of giant stars in the Continuous Viewing Zones and beyond

J. Ted Mackereth, Andrea Miglio, Yvonne Elsworth +30

The NASA- mission presents a treasure trove for understanding the stars it observes and the Milky Way, in which they reside. We present a first look at the prospects for…

astro-ph.GA2020★ 84 cited

An extended halo around an ancient dwarf galaxy

Anirudh Chiti, Anna Frebel, Joshua D. Simon +7

The Milky Way is surrounded by dozens of ultra-faint (< solar luminosities) dwarf satellite galaxies. They are the surviving remnants of the earliest galaxies, as confirmed…

astro-ph.GA2020★ 202 cited

Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances

Gagandeep S. Anand, Janice C. Lee, Schuyler D. Van Dyk +29

PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, the dat…

astro-ph.GA2020★ 97 cited

On the duration of the embedded phase of star formation

Jaeyeon Kim, Mélanie Chevance, J. M. Diederik Kruijssen +23

Feedback from massive stars plays a key role in molecular cloud evolution. After the onset of star formation, the young stellar population is exposed by photoionization, winds, sup…

astro-ph.GA2020★ 29 cited

Orbital Torus Imaging: Using Element Abundances to Map Orbits and Mass in the Milky Way

Adrian M. Price-Whelan, David W. Hogg, Kathryn V. Johnston +9

Many approaches to galaxy dynamics assume that the gravitational potential is simple and the distribution function is time-invariant. Under these assumptions there are traditional…

astro-ph.GA2020★ 46 cited

Eridanus II: A Fossil from Reionization with an Off-Center Star Cluster

Joshua D. Simon, Thomas M. Brown, Alex Drlica-Wagner +10

We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of M_V = -7.1, is located at a…

astro-ph.GA2020★ 69 cited

Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations

Feige Wang, Xiaohui Fan, Jinyi Yang +14

X-ray emission from quasars has been detected up to redshift , although only limited to a few objects at . In this work, we present new Chandra observations of five $…

astro-ph.GA2020★ 45 cited

591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2

Yin-Bi Li, A-Li Luo, You-Jun Lu +14

In this paper, we report 591 high velocity star candidates (HiVelSCs) selected from over 10 million spectra of the data release seven (DR7) of the Large Sky Area Multi-object Fiber…

astro-ph.GA2020★ 21 cited

The black hole mass of the multiply imaged quasar SDSS J2222+2745 from velocity-resolved time lags of the CIV emission line

Peter R. Williams, Tommaso Treu, Håkon Dahle +6

We present the first results of a 4.5 year monitoring campaign of the three bright images of multiply imaged quasar SDSS J2222+2745 using the Gemini North Multi-Object Sp…

astro-ph.GA2020★ 34 cited

Identifying RR Lyrae Variable Stars in Six Years of the Dark Energy Survey

K. M. Stringer, A. Drlica-Wagner, L. Macri +67

We present a search for RR Lyrae stars using the full six-year data set from the Dark Energy Survey (DES) covering ~5,000 sq. deg. of the southern sky. Using a multi-stage multi-va…

astro-ph.GA2020★ 19 cited

An Amusing Look at the Host of the Periodic Nuclear Transient ASASSN-14ko Reveals a Second AGN

M. A. Tucker, B. J. Shappee, J. T. Hinkle +10

We present Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectroscopy of ESO 253G003, which hosts a known Active Galactic Nucleus (AGN) and the periodic nuclear transi…

astro-ph.GA2020★ 11 cited

Pre-supernova feedback mechanisms drive the destruction of molecular clouds in nearby star-forming disc galaxies

Mélanie Chevance, J. M. Diederik Kruijssen, Mark R. Krumholz +28

It is a major open question which physical processes stop the accretion of gas onto giant molecular clouds (GMCs) and limit the efficiency at which gas is converted into stars with…

astro-ph.GA2020★ 60 cited

Preliminary Target Selection for the DESI Milky Way Survey (MWS)

Carlos Allende Prieto, Andrew P. Cooper, Arjun Dey +31

The DESI Milky Way Survey (MWS) will observe 8 million stars between mag, supplemented by observations of brighter targets under poor observing conditions. The s…

astro-ph.GA2020★ 17 cited

The Cosmic Ultraviolet Baryon Survey (CUBS) II: Discovery of an H-Bearing DLA in the Vicinity of an Early-Type Galaxy at z = 0.576

Erin Boettcher, Hsiao-Wen Chen, Fakhri S. Zahedy +18

We report the serendipitous detection of an H-bearing damped Lyman- absorber at z = 0.576 in the spectrum of the QSO J0111-0316 in the Cosmic Ultraviolet Baryon Survey. Sp…

astro-ph.GA2020★ 7 cited

Dorado and its member galaxies. Ha imaging of the group backbone

R. Rampazzo, S. Ciroi, P. Mazzei +9

ABRIDGED: Dorado is a nearby, rich and clumpy galaxy group that extends for several degrees in the Southern Hemisphere. For the first time, we map the Ha distribution as a possible…

astro-ph.GA2020★ 91 cited

Black Hole Mergers from Hierarchical Triples in Dense Star Clusters

Miguel A. S. Martinez, Giacomo Fragione, Kyle Kremer +8

Hierarchical triples are expected to be produced by the frequent binary-mediated interactions in the cores of globular clusters. In some of these triples, the tertiary companion ca…

astro-ph.GA2020★ 47 cited

Discovery of an Ultra-Faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration (DELVE) Survey

W. Cerny, A. B. Pace, A. Drlica-Wagner +29

We report the discovery of a new ultra-faint stellar system found near the Magellanic Clouds in the DECam Local Volume Exploration (DELVE) Survey. This new system, DELVE J015568…

astro-ph.GA2020★ 44 cited

Probing the Nature of High Redshift Weak Emission Line Quasars: A Young Quasar with a Starburst Host Galaxy

Irham Taufik Andika, Knud Jahnke, Masafusa Onoue +15

We present the discovery of PSO J083.8371+11.8482, a weak emission line quasar with extreme star formation rate at . This quasar was selected from Pan-STARRS1, UHS, and u…

astro-ph.GA2020★ 11 cited

Mathematical Underpinnings of the Multi-Wavelength Structure of the TRGB

Barry F. Madore, Wendy L. Freedman

We consider the application of the tip of the red giant branch (TRGB) in the optical and in the near infrared for the determination of distances to nearby galaxies. We analyze ACS…

astro-ph.GA2020★ 7 cited

Extended radio AGN at z ~ 1 in the ORELSE survey: The confining effect of dense environments

Lu Shen, Guilin Liu, Mengfei Zhang +16

Recent hydrodynamic simulations and observations of radio jets have shown that the surrounding environment has a large effect on their resulting morphology. To investigate this we…

astro-ph.GA2020★ 8 cited

An uncertainty principle for star formation -- V. The influence of dust extinction on star formation rate tracer lifetimes and the inferred molecular cloud lifecycle

Daniel T. Haydon, Yusuke Fujimoto, Mélanie Chevance +3

Recent observational studies aiming to quantify the molecular cloud lifecycle require the use of known 'reference time-scales' to turn the relative durations of different phases of…

astro-ph.GA2020★ 72 cited

Measuring the mixing scale of the ISM within nearby spiral galaxies

Kathryn Kreckel, I-Ting Ho, Guillermo A. Blanc +28

The spatial distribution of metals reflects, and can be used to constrain, the processes of chemical enrichment and mixing. Using PHANGS-MUSE optical integral field spectroscopy, w…

astro-ph.GA2020★ 153 cited

Molecular Gas Properties on Cloud Scales Across the Local Star-forming Galaxy Population

Jiayi Sun, Adam K. Leroy, Eva Schinnerer +34

Using the PHANGS-ALMA CO (2-1) survey, we characterize molecular gas properties on 100 pc scales across 102,778 independent sightlines in 70 nearby galaxies. This yields th…

astro-ph.GA2020★ 70 cited

A Complete Census of Circumgalactic MgII at Redshift z<~ 0.5

Yun-Hsin Huang, Hsiao-Wen Chen, Stephen A. Shectman +5

We present a survey of MgII absorbing gas in the vicinity of 380 random galaxies, using 156 background quasi-stellar objects(QSOs) as absorption-line probes. The sample comprises 2…