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X-ray Emission from Optically Selected Radio-Intermediate and Radio-Loud Quasars
B. P. Miller, W. N. Brandt, D. P. Schneider +3
We present the results of an investigation into the X-ray properties of radio-intermediate and radio-loud quasars (RIQs and RLQs, respectively). We combine large, modern optical (e…
The Blue Tip of the Stellar Locus: Measuring Reddening with the SDSS
Edward F. Schlafly, Douglas P. Finkbeiner, David J. Schlegel +5
We present measurements of reddening due to dust using the colors of stars in the Sloan Digital Sky Survey (SDSS). We measure the color of main sequence turn-off stars by finding t…
The X-Ray Properties of the Optically Brightest Mini-BAL Quasars from the Sloan Digital Sky Survey
Jianfeng Wu, W. N. Brandt, M. L. Comins +4
We have compiled a sample of 14 of the optically brightest radio-quiet quasars (~~17.5 and ~~1.9) in the Sloan Digital Sky Survey Data Release 5 quasar catalog…
Quasar Selection Based on Photometric Variability
C. L. MacLeod, K. Brooks, Z. Ivezic +7
We develop a method for separating quasars from other variable point sources using SDSS Stripe 82 light curve data for ~10,000 variable objects. To statistically describe quasar va…
Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
C. L. MacLeod, Ž. Ivezić, C. S. Kochanek +10
We model the time variability of ~9,000 spectroscopically confirmed quasars in SDSS Stripe 82 as a damped random walk. Using 2.7 million photometric measurements collected over 10…
The Evolution of Quasar CIV and SiIV Broad Absorption Lines Over Multi-Year Time Scales
Robert R. Gibson, W. N. Brandt, S. C. Gallagher +2
We investigate the variability of CIV 1549A broad absorption line (BAL) troughs over rest-frame time scales of up to ~7 yr in 14 quasars at redshifts z>2.1. For 9 sources at suffic…