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X-rays from the First Massive Black Holes
W. N. Brandt, C. Vignali, D. P. Schneider +7
X-ray studies of high-redshift (z > 4) active galaxies have advanced substantially over the past few years, largely due to results from the new generation of X-ray observatories. A…
The Redshift of a Lensing Galaxy in PMN J0134-0931
Patrick B. Hall, Gordon T. Richards, Donald G. York +5
The Sloan Digital Sky Survey (SDSS) automatically targeted as a quasar candidate the recently discovered, gravitationally lensed, extremely reddened z=2.2 quasar PMN J0134-0931. Th…
An FeLoBAL Binary Quasar
Michael D. Gregg, Robert H. Becker, Richard L. White +3
In an ongoing infrared imaging survey of quasars at Keck Observatory, we have discovered that the z=1.285 quasar SDSS J233646.2-010732.6 comprises two point sources with a separati…
A feature at z ~ 3.2 in the evolution of the Ly-alpha forest optical depth
M. Bernardi, R. K. Sheth, M. Subbarao +11
The effective optical depth in the Ly-alpha forest region of 1061 low-resolution QSO spectra drawn from the SDSS database decreases with decreasing redshift over the range 2.5 < z…
Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
Gordon T. Richards, Daniel E. Vanden Berk, Timothy A. Reichard +5
Using a sample of 3814 quasars from the Sloan Digital Sky Survey, we confirm that high-ionization, broad, emission lines such as CIV are significantly blueshifted with respect to l…
Unusual Broad Absorption Line Quasars from the Sloan Digital Sky Survey
Patrick B. Hall, S. F. Anderson, M. A. Strauss +6
The Sloan Digital Sky Survey has confirmed the existence of populations of broad absorption line (BAL) quasars with various unusual properties. We present and discuss twenty-three…