1.2k citations · 4.5k across the 94 of their papers we have counts for
32 papers · 1 filter
Quasar Broad Absorption Line Variability on Multi-Year Time Scales
Robert R. Gibson, W. N. Brandt, Donald P. Schneider +1
We use quantitative metrics to characterize the variation of CIV 1549 A broad absorption lines (BALs) over 3--6 (rest-frame) years in a sample of 13 quasars at 1.7 <= z <= 2.8 and…
The Revealing Dust: Mid-Infrared Activity in Hickson Compact Group Galaxy Nuclei
S. C. Gallagher, K. E. Johnson, A. E. Hornschemeier +2
We present a sample of 46 galaxy nuclei from 12 nearby (z<4500 km/s) Hickson Compact Groups (HCGs) with a complete suite of 1-24 micron 2MASS+Spitzer nuclear photometry. For all ob…
The Infrared Properties of Hickson Compact Groups
K. E. Johnson, J. E. Hibbard, S. C. Gallagher +4
Compact groups of galaxies provide a unique environment to study the mechanisms by which star formation occurs amid continuous gravitational encounters. We present 2MASS (JHK), Spi…
Chandra Stacking Constraints on the Contribution of 24 micron Spitzer Sources to the Unresolved Cosmic X-ray Background
A. T. Steffen, W. N. Brandt, D. M. Alexander +2
We employ X-ray stacking techniques to examine the contribution from X-ray undetected, mid-infrared-selected sources to the unresolved, hard (6-8 keV) cosmic X-ray background (CXB)…
Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
S. C. Gallagher, D. C. Hines, M. Blaylock +3
We have compiled the largest sample of multiwavelength spectral energy distributions (SEDs) of Broad Absorption Line (BAL) quasars to date, from the radio to the X-ray. We present…
Discovery of Probable Relativistic Fe Emission and Absorption in the Cloverleaf Quasar H 1413+117
G. Chartas, M. Eracleous, X. Dai +2
We present results from Chandra and XMM-Newton observations of the low-ionization broad absorption line (LoBAL) quasar H 1413+117. Our spatial and spectral analysis of a recent dee…