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16 papers · 2 filters
Morphological evolution of supermassive black hole merger hosts and multimessenger signatures
Colin DeGraf, Debora Sijacki, Tiziana Di Matteo +3
With projects such as Laser Interferometer Space Antenna (LISA) and Pulsar Timing Arrays expected to detect gravitational waves from supermassive black hole mergers in the near fut…
Deciphering the 3-D Orion Nebula-II: A low-ionization region of multiple velocity components southwest of Theta1OriC confounds interpretation of low velocity resolution studies of temperature, density, and abundance
C. R. O'Dell, N. P. Abel, G. J. Ferland
We establish that there are two velocity systems along lines-of-sight that contribute to the emission-line spectrum of the the brightest parts of the Orion Nebula. These overlie th…
Placing High-Redshift Quasars in Perspective: a Catalog of Spectroscopic Properties from the Gemini Near Infrared Spectrograph -- Distant Quasar Survey
Brandon M. Matthews, Ohad Shemmer, Cooper Dix +15
We present spectroscopic measurements for 226 sources from the Gemini Near Infrared Spectrograph - Distant Quasar Survey (GNIRS-DQS). Being the largest uniform, homogeneous survey…
Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
Jonathan Florez, Andreas A. Berlind, Sheila J. Kannappan +6
We measure the environmental dependence, where environment is defined by the distance to the third nearest neighbor, of multiple galaxy properties inside the Environmental COntext…
Investigating orientation effects considering angular resolution for a sample of radio-loud quasars using VLA observations
Jaya Maithil, Jessie C. Runnoe, Michael S. Brotherton +4
Radio core dominance measurements, an indicator of jet orientation, sometimes rely on core flux density measurements from large-area surveys like Faint Images of the Radio Sky at T…
Space Telescope and Optical Reverberation Mapping Project. XII. Broad-Line Region Modeling of NGC 5548
P. R. Williams, A. Pancoast, T. Treu +155
We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photo…
Machine Learning the Fates of Dark Matter Subhalos: A Fuzzy Crystal Ball
Abigail Petulante, Andreas A. Berlind, J. Kelly Holley-Bockelmann +1
The evolution of a dark matter halo in a dark matter only simulation is governed purely byNewtonian gravity, making a clean testbed to determine what halo properties drive its fate…
Stellar parameters for the First Release of the MaStar Library: An Empirical Approach
Yan-Ping Chen, Renbin Yan, Claudia Maraston +10
We report the stellar atmospheric parameters for 7503 spectra contained in the first release of the MaNGA stellar library (MaStar) in SDSS DR15. The first release of MaStar contain…
Inside Out and Upside-Down: The Roles of Gas Cooling and Dynamical Heating in Shaping the Stellar Age-Velocity Relation
Jonathan C. Bird, Sarah R. Loebman, David H. Weinberg +3
Kinematic studies of disk galaxies, using individual stars in the Milky Way or statistical studies of global disk kinematics over time, provide insight into how disks form and evol…
Orientation and accretion in a representative sample of active galactic nuclei
Jessie Runnoe, Todd Boroson
We highlight a representative sample of active galactic nuclei selected independent of orientation. The defining characteristic of the selection is sophisticated matching between t…
Untangling the Galaxy. II. Structure within 3 kpc
Marina Kounkel, Kevin Covey, Keivan G. Stassun
We present the results of the hierarchical clustering analysis of the Gaia DR2 data to search for clusters, co-moving groups, and other stellar structures. The current paper builds…
Deciphering the 3-D Orion Nebula-I: Expanding Shells in the Huygens Region
C. R. O'Dell, N. P. Abel, G. J. Ferland
Based on imaging and spectroscopic data, we develop a 3-D model for the Huygens Region of the Orion Nebula. Theta1OriC , the hottest star in the Trapezium, is surrounded by a wind-…
Space Telescope and Optical Reverberation Mapping Project. IX. Velocity-Delay Maps for Broad Emission Lines in NGC 5548
Keith Horne, G. De Rosa, B. M. Peterson +155
We report velocity-delay maps for prominent broad emission lines, Ly_alpha, CIV, HeII and H_beta, in the spectrum of NGC5548. The emission-line responses inhabit the interior of a…
The role of gravitational recoil in the assembly of massive black hole seeds
Glenna Dunn, Kelly Holley-Bockelmann, Jillian Bellovary
When two black holes merge, the asymmetric emission of gravitational waves provides an impulse to the merged system; this gravitational wave recoil velocity can be up to 4000 km s$…
The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
Alessandra De Rosa, Cristian Vignali, Tamara Bogdanović +27
The quest for binary and dual supermassive black holes (SMBHs) at the dawn of the multi-messenger era is compelling. Detecting dual active galactic nuclei (AGN) -- active SMBHs at…
Age dating of an early Milky Way merger via asteroseismology of the naked-eye star Indi
William J. Chaplin, Aldo M. Serenelli, Andrea Miglio +81
Over the course of its history, the Milky Way has ingested multiple smaller satellite galaxies. While these accreted stellar populations can be forensically identified as kinematic…