Showing 2018 · astro-ph.GAShow all

70 papers · 2 filters

astro-ph.GA2018★ 13 cited

The Neutral Hydrogen Properties of Galaxies in Gas-rich Groups

Robert Džudžar, Virginia Kilborn, Gerhardt Meurer +23

We present an analysis of the integrated neutral hydrogen (HI) properties for 27 galaxies within nine low mass, gas-rich, late-type dominated groups which we denote "Choirs". We fi…

astro-ph.GA2018★ 18 cited

SOFIA/FORCAST resolves 30 - 40 um extended dust emission in nearby active galactic nuclei

Lindsay Fuller, Enrique Lopez-Rodriguez, Chris Packham +7

We present arcsecond-scale observations of the active galactic nuclei (AGNs) of seven nearby Seyfert galaxies observed from the Stratospheric Observatory For Infrared Astronomy (SO…

astro-ph.GA2018★ 161 cited

The NANOGrav 11-Year Data Set: Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries

K. Aggarwal, Z. Arzoumanian, P. T. Baker +60

Observations indicate that nearly all galaxies contain supermassive black holes (SMBHs) at their centers. When galaxies merge, their component black holes form SMBH binaries (SMBHB…

astro-ph.GA2018★ 8 cited

Adding a Suite of Chemical Abundances to the MACER Code for the Evolution of Massive Elliptical Galaxies

Zhaoming Gan, Ena Choi, Jeremiah P. Ostriker +2

We add a suite of chemical abundances to the MACER (Massive AGN Controlled Ellipticals Resolved) 2D code, by solving 12 additional continuity equations for H, He, C, N, O, Ne, Mg,…

astro-ph.GA2018★ 294 cited

The star-formation activity of IllustrisTNG galaxies: main sequence, UVJ diagram, quenched fractions, and systematics

Martina Donnari, Annalisa Pillepich, Dylan Nelson +6

We select galaxies from the IllustrisTNG hydrodynamical simulations ( at ) and characterize the shapes and evolutions of their UVJ and star-format…

astro-ph.GA2018★ 32 cited

CHILES: HI morphology and galaxy environment at z=0.12 and z=0.17

Kelley M. Hess, Nicholas M. Luber, Ximena Fernández +27

We present a study of 16 HI-detected galaxies found in 178 hours of observations from Epoch 1 of the COSMOS HI Large Extragalactic Survey (CHILES). We focus on two redshift ranges…

astro-ph.GA2018★ 28 cited

The impact of AGN on stellar kinematics and orbits in simulated massive galaxies

Matteo Frigo, Thorsten Naab, Michaela Hirschmann +5

We present a series of 20 cosmological zoom simulations of the formation of massive galaxies with and without a model for AGN feedback. Differences in stellar population and kinema…

astro-ph.GA2018★ 23 cited

A machine--vision method for automatic classification of stellar halo substructure

David Hendel, Kathryn V. Johnston, Rohit K. Patra +1

Tidal debris structures formed from disrupted satellites contain important clues about the assembly histories of galaxies. To date, studies of these structures have been hampered b…

astro-ph.GA2018★ 147 cited

Jellyfish galaxies with the IllustrisTNG simulations: I. Gas-stripping phenomena in the full cosmological context

Kiyun Yun, Annalisa Pillepich, Elad Zinger +8

We use IllustrisTNG, a suite of gravity and MHD simulations, to study the demographics and properties of jellyfish galaxies in the full cosmological context. By jellyfish galaxies,…

astro-ph.GA2018★ 82 cited

Synthetic nebular emission from massive galaxies II: ultraviolet-line diagnostics of dominant ionizing sources

Michaela Hirschmann, Stéphane Charlot, Anna Feltre +3

We compute synthetic optical and ultraviolet (UV) emission-line properties of galaxies in a full cosmological framework by coupling, in post-processing, new-generation nebular-emis…

astro-ph.GA2018★ 27 cited

Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within years

Kohei Ichikawa, Junko Ueda, Hyun-Jin Bae +4

Arp 187 is one of the fading active galactic nuclei (AGN), whose AGN activity is currently decreasing in luminosity. We investigate the observational signatures of AGN in Arp 187,…

astro-ph.GA2018★ 105 cited

BAT AGN Spectroscopic Survey - XI. The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei

Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda +10

We quantify the luminosity contribution of active galactic nuclei (AGN) to the 12 m, mid-infrared (MIR; 5-38 m), and the total IR (5-1000 m) emission in the local AGN dete…

astro-ph.GA2018★ 10 cited

Abundance matching for low mass galaxies in the CDM and FDM models

Pierre Cristofari, Jeremiah P. Ostriker

Abundance matching between galaxies and halos has proven to be an informative technique, less dependent on detailed physical approximations than some other methods. We extend the d…

astro-ph.GA2018★ 125 cited

Zooming in on accretion - II. Cold Circumgalactic Gas Simulated with a super-Lagrangian Refinement Scheme

Joshua Suresh, Dylan Nelson, Shy Genel +2

In this study we explore the complex multi-phase gas of the circumgalactic medium (CGM) surrounding galaxies. We propose and implement a novel, super-Lagrangian 'CGM zoom' scheme i…

astro-ph.GA2018★ 18 cited

The z=0.54 LoBAL Quasar SDSS J085053.12+445122.5: II. The Nature of Partial Covering in the Broad-Absorption-Line Outflow

Karen M. Leighly, Donald M. Terndrup, Adrian B. Lucy +5

It has been known for 20 years that the absorbing gas in broad absorption line quasars does not completely cover the continuum emission region, and that partial covering must be ac…

astro-ph.GA2018★ 32 cited

H2 self-shielding with non-LTE rovibrational populations: implications for cooling in protogalaxies

J. Wolcott-Green, Z. Haiman

The abundance of molecular hydrogen (H2), the primary coolant in primordial gas, is critical for the thermodynamic evolution and star-formation histories in early protogalaxies. De…

astro-ph.GA2018★ 16 cited

Gravitational interactions of stars with supermassive black hole binaries - II. Hypervelocity stars

Siva Darbha, Eric R. Coughlin, Daniel Kasen +1

Supermassive black holes (SMBHs) in galactic nuclei can eject hypervelocity stars (HVSs). Using restricted three-body integrations, we study the properties of stars ejected by circ…

astro-ph.GA2018★ 193 cited

Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes

Tyrone E. Woods, Bhaskar Agarwal, Volker Bromm +30

In recent years, the discovery of massive quasars at z~7 has provided a striking challenge to our understanding of the origin and growth of supermassive black holes in the early Un…

astro-ph.GA2018★ 400 cited

The Circular Velocity Curve of the Milky Way from to kpc

Anna-Christina Eilers, David W. Hogg, Hans-Walter Rix +1

We measure the circular velocity curve of the Milky Way with the highest precision to date across Galactocentric distances of kpc. Our analysis dra…

astro-ph.GA2018★ 74 cited

Stellar Radiation is Critical for Regulating Star Formation and Driving Outflows in Low Mass Dwarf Galaxies

Andrew Emerick, Greg L. Bryan, Mordecai-Mark Mac Low

Effective stellar feedback is used in models of galaxy formation to drive realistic galaxy evolution. Models typically include energy injection from supernovae as the dominant form…

astro-ph.GA2018★ 106 cited

The Role of Black Hole Feedback on Size and Structural Evolution in Massive Galaxies

Ena Choi, Rachel S. Somerville, Jeremiah P. Ostriker +2

We use cosmological hydrodynamical simulations to investigate the role of feedback from accreting black holes on the evolution of sizes, compactness, stellar core density and speci…

astro-ph.GA2018★ 26 cited

Identifying Direct Collapse Black Hole Seeds through their Small Host Galaxies

Eli Visbal, Zoltan Haiman

Observations of high-redshift quasars indicate that super massive black holes (SMBHs) with masses greater than were assembled within the first billion years af…

astro-ph.GA2018★ 31 cited

IQ-Collaboratory 1.1: the Star-Forming Sequence of Simulated Central Galaxies

ChangHoon Hahn, Tjitske K. Starkenburg, Ena Choi +12

A tightly correlated star formation rate-stellar mass relation of star forming galaxies, or star-forming sequence (SFS), is a key feature in galaxy property-space that is predicted…

astro-ph.GA2018★ 455 cited

The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations

Vicente Rodriguez-Gomez, Gregory F. Snyder, Jennifer M. Lotz +12

We have generated synthetic images of 27,000 galaxies from the IllustrisTNG and the original Illustris hydrodynamic cosmological simulations, designed to match Pan-STARRS obs…