Showing 2019 · astro-ph.GAShow all

47 papers · 2 filters

astro-ph.GA2019★ 56 cited

The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2017/2018 follow-up campaign: Discovery of 10 lensed quasars and 10 quasar pairs

C. Lemon, M. W. Auger, R. McMahon +65

We report the results of the STRong lensing Insights from the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed q…

astro-ph.GA2019★ 69 cited

A mass threshold for galactic gas discs by spin flips

Avishai Dekel, Omri Ginzburg, Fangzhou Jiang +4

We predict, analytically and by simulations, that gas discs tend to survive only in haloes above a threshold mass (stellar mass )…

astro-ph.GA2019★ 203 cited

Milky Way Satellite Census. II. Galaxy--Halo Connection Constraints Including the Impact of the Large Magellanic Cloud

E. O. Nadler, R. H. Wechsler, K. Bechtol +63

The population of Milky Way (MW) satellites contains the faintest known galaxies and thus provides essential insight into galaxy formation and dark matter microphysics. Here we com…

astro-ph.GA2019★ 175 cited

Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1

A. Drlica-Wagner, K. Bechtol, S. Mau +55

We report the results of a systematic search for ultra-faint Milky Way satellite galaxies using data from the Dark Energy Survey (DES) and Pan-STARRS1 (PS1). Together, DES and PS1…

astro-ph.GA2019★ 1.5k cited

The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra

Romina Ahumada, Carlos Allende Prieto, Andres Almeida +310

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 release of…

astro-ph.GA2019★ 73 cited

Birds of a Feather? Magellan/IMACS Spectroscopy of the Ultra-Faint Satellites Grus II, Tucana IV, and Tucana V

J. D. Simon, T. S. Li, D. Erkal +54

We present Magellan/IMACS spectroscopy of three recently discovered ultra-faint Milky Way satellites, Grus II, Tucana IV, and Tucana V. We measure systemic velocities of V_hel = -1…

astro-ph.GA2019★ 14 cited

On the Mass Assembly History of the Local Group

Edoardo Carlesi, Yehuda Hoffman, Stefan Gottlöber +4

In this work an ensemble of simulated Local Group analogues is used to constrain the properties of the mass assembly history of the Milky Way (MW) and Andromeda (M31) galaxies. The…

astro-ph.GA2019★ 22 cited

Mapping electron temperature variations across a spiral arm in NGC 1672

I-Ting Ho, Kathryn Kreckel, Sharon E. Meidt +17

We report one of the first extragalactic observations of electron temperature variations across a spiral arm. Using MUSE mosaic observations of the nearby galaxy NGC 1672, we measu…

astro-ph.GA2019★ 168 cited

Mapping metallicity variations across nearby galaxy disks

K. Kreckel, I. -T. Ho, G. A. Blanc +21

The distribution of metals within a galaxy traces the baryon cycle and the buildup of galactic disks, but the detailed gas phase metallicity distribution remains poorly sampled. We…

astro-ph.GA2019★ 57 cited

The CALIFA view on stellar angular momentum across the Hubble sequence

J. Falcón-Barroso, G. van de Ven, M. Lyubenova +32

[Abridged] We present the apparent stellar angular momentum of 300 galaxies across the Hubble sequence, using integral-field spectroscopic data from the CALIFA survey. Adopting the…

astro-ph.GA2019★ 28 cited

A few StePS forward in unveiling the complexity of galaxy evolution: light-weighted stellar ages of intermediate redshift galaxies with WEAVE

L. Costantin, A. Iovino, S. Zibetti +29

The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide invaluable information for reconstructing the history of star formation in individu…

astro-ph.GA2019★ 38 cited

Weak Evolution of the Mass-metallicity Relation at Cosmic Dawn in the FirstLight Simulations

Ivanna Langan, Daniel Ceverino, Kristian Finlator

Little is known about the mass-metallicity relation (MZR) in galaxies at cosmic dawn. Studying the first appearance of the MZR is one of the keys to understanding the formation and…

astro-ph.GA2019★ 27 cited

The orientation of planes of dwarf galaxies in the quasi-linear Universe

Noam I Libeskind, Edoardo Carlesi, Oliver Muller +9

To date at least 10 highly flattened planes of dwarf galaxies are claimed to have been discovered in the Local Universe. The origin of these planes of galaxies remains unknown. One…

astro-ph.GA2019★ 52 cited

Search for RR Lyrae stars in DES ultra-faint systems: Grus I, Kim 2, Phoenix II, and Grus II

C. E. Martínez-Vázquez, A. K. Vivas, M. Foucoin +57

This work presents the first search for RR Lyrae stars (RRLs) in four of the ultra-faint systems imaged by the Dark Energy Survey (DES) using SOAR/Goodman and Blanco/DECam imagers.…

astro-ph.GA2019★ 23 cited

2D-Galactic chemical evolution: the role of the spiral density wave

Mercedes Mollá, Sheillah Wekesa, Oscar Cavichia +6

We present a 2-dimensional chemical evolution code applied to a Milky Way type galaxy, incorporating the role of spiral arms in shaping azimuthal abundance variations, and confront…

astro-ph.GA2019★ 89 cited

Stellar Velocity Dispersion of a Massive Quenching Galaxy at z=4.01

Masayuki Tanaka, Francesco Valentino, Sune Toft +12

We present the first stellar velocity dispersion measurement of a massive quenching galaxy at z=4.01. The galaxy is first identified as a massive z>~4 galaxy with suppressed star f…

astro-ph.GA2019★ 6 cited

Inner and outer star forming regions over the disks of spiral galaxies. II. A comparative of physical properties and evolutionary stages

M. Rodríguez-Baras, A. I. Díaz, F. F. Rosales-Ortega

The HII regions are all studied employing the same general prescriptions, despite the possible influence of their environment in their star formation processes. Through the analysi…

astro-ph.GA2019★ 20 cited

Machine Learning Classifiers for Intermediate Redshift Emission Line Galaxies

Kai Zhang, David J. Schlegel, Brett H. Andrews +5

Classification of intermediate redshift ( = 0.3--0.8) emission line galaxies as star-forming galaxies, composite galaxies, active galactic nuclei (AGN), or low-ionization nuclea…

astro-ph.GA2019★ 4 cited

An analysis of satellite planar configurations around the MW and M31: singling out new high quality planes

Isabel M. Santos-Santos, Rosa Domínguez-Tenreiro, Marcel S. Pawlowski

We present a detailed characterization of planes of satellites in the Milky Way (MW) and M31 systems. To this end we introduce an extension to the '4-galaxy-normal density plot' me…

astro-ph.GA2019★ 12 cited

UV bright red-sequence galaxies: how do UV upturn systems evolve in redshift and stellar mass?

M. L. L. Dantas, P. R. T. Coelho, R. S. de Souza +1

The so-called ultraviolet (UV) upturn of elliptical galaxies is a phenomenon characterised by the up-rise of their fluxes in bluer wavelengths, typically in the 1,200-2,500A range.…

astro-ph.GA2019★ 21 cited

[OII] emitters in MultiDark-Galaxies and DEEP2

G. Favole, V. Gonzalez-Perez, A. Orsi +13

We use three semi-analytic models (SAMs) of galaxy formation and evolution, run on the same 1Gpc MultiDark Planck2 cosmological simulation, to investigate the properties of…

astro-ph.GA2019★ 118 cited

Optimising Automatic Morphological Classification of Galaxies with Machine Learning and Deep Learning using Dark Energy Survey Imaging

Ting-Yun Cheng, Christopher J. Conselice, Alfonso Aragón-Salamanca +13

There are several supervised machine learning methods used for the application of automated morphological classification of galaxies; however, there has not yet been a clear compar…

astro-ph.GA2019★ 27 cited

Survival of molecular gas in a stellar feedback-driven outflow witnessed with the MUSE TIMER project and ALMA

Ryan Leaman, Francesca Fragkoudi, Miguel Querejeta +15

Stellar feedback plays a significant role in modulating star formation, redistributing metals, and shaping the baryonic and dark structure of galaxies -- however, the efficiency of…

astro-ph.GA2019★ 7 cited

J-PLUS: the impact of bars on quenching time-scales in nearby green valley disc galaxies

J. P. Nogueira-Cavalcante, R. Dupke, P. Coelho +28

In a framework where galaxies mostly migrate on the colour-magnitude diagram from star-forming to quiescent, the green valley is considered a transitional galaxy stage. The details…