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Brightening X-ray Emission from GW170817/GRB170817A: Further Evidence for an Outflow
John J. Ruan, Melania Nynka, Daryl Haggard +2
The origin of the X-ray emission from neutron star coalescence GW170817/GRB170817A is a key diagnostic of the unsettled post-merger narrative, and different scenarios predict disti…
A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
Daryl Haggard, Melania Nynka, John J. Ruan +4
We report Chandra observations of GW170817, the first neutron star-neutron star merger discovered by the joint LIGO-Virgo Collaboration, and the first direct detection of gravitati…
The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment
Bela Abolfathi, D. S. Aguado, Gabriela Aguilar +344
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since July 2014. This paper describes the second data release from this phase, and the fourtee…
The Time-Domain Spectroscopic Survey: Target Selection for Repeat Spectroscopy
Chelsea L. MacLeod, Paul J. Green, Scott F. Anderson +35
As astronomers increasingly exploit the information available in the time domain, spectroscopic variability in particular opens broad new channels of investigation. Here we describ…
A Mote in Andromeda's Disk: a Misidentified Periodic AGN Behind M31
Trevor Dorn-Wallenstein, Emily M. Levesque, John J. Ruan
We identify an object previously thought to be a star in the disk of M31, J0045+41, as a background AGN seen through a low-absorption region of M31. We present mode…