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Debiasing Standard Siren Inference of the Hubble Constant with Marginal Neural Ratio Estimation
Samuel Gagnon-Hartman, John Ruan, Daryl Haggard
Gravitational wave (GW) standard sirens may resolve the Hubble tension, provided that standard siren inference of is free from systematic biases. However, standard sirens fro…
Empirical Links between XRB and AGN accretion using the complete z<0.4 spectroscopic CSC/SDSS Catalog
Markos Trichas, Paul Green, Anca Constantin +8
Striking similarities have been seen between accretion signatures of Galactic X-ray binary (XRB) systems and active galactic nuclei (AGN). XRB spectral states show a V-shaped corre…
The Baryon Oscillation Spectroscopic Survey of SDSS-III
Kyle S. Dawson, David J. Schlegel, Christopher P. Ahn +162
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the…
The Chandra Multi-Wavelength Project: Optical Spectroscopy and the Broadband Spectral Energy Distributions of X-ray Selected AGN
Markos Trichas, Paul J. Green, John D. Silverman +20
From optical spectroscopy of X-ray sources observed as part of ChaMP, we present redshifts and classifications for a total of 1569 Chandra sources from our targeted spectroscopic f…
Constraining Variable High Velocity Winds from Broad Absorption Line Quasars with Multi-Epoch Spectroscopy
Daryl Haggard, Kenza S. Arraki, Paul J. Green +2
Broad absorption line (BAL) quasars probe the high velocity gas ejected by luminous accreting black holes. BAL variability timescales place constraints on the size, location, and d…
HST Spectral Observations near the He II Ly-alpha Break: Implications for He II Reionization
David Syphers, Scott F. Anderson, Wei Zheng +4
Quasars that allow the study of IGM He II are very rare, since they must be at high redshift along sightlines free of substantial hydrogen absorption, but recent work has dramatica…