9 papers
Quasar Radio Dichotomy: Two Peaks, or not Two Peaks, that is the Question
Z. Ivezic, G. T. Richards, P. B. Hall +8
Recent claims by Ivezic et al. (2002) that the distribution of the radio-to-optical flux ratio, R, for quasars is bimodal (the so-called quasar radio dichotomy) were questioned on…
Counts of Low-redshift SDSS Quasar Candidates
Z. Ivezic, R. H. Lupton, D. E. Johnston +10
We analyze the counts of low-redshift quasar candidates selected using nine-epoch SDSS imaging data. The co-added catalogs are more than 1 mag deeper than single-epoch SDSS data, a…
Halo Structure Traced by SDSS RR Lyrae
Z. Ivezic, R. H. Lupton, D. Schlegel +6
We discuss the density and radial velocity distributions of over 3000 candidate RR Lyrae stars selected by various methods using Sloan Digital Sky Survey data for about 1000 deg^2…
J-Band Spectroscopy of the z = 5.74 BAL QSO SDSSp J104433.04-012502.2
R. W. Goodrich, R. Campbell, F. Chaffee +8
We use the NIRSPEC near-IR spectrometer on Keck II to obtain moderate resolution (R = 1540) spectroscopy that shows conclusively that the C IV emission line in the z = 5.74 quasar…
Extreme BAL Quasars from the Sloan Digital Sky Survey
Patrick B. Hall, J. E. Gunn, G. R. Knapp +16
The Sloan Digital Sky Survey has discovered a population of broad absorption line quasars with various extreme properties. Many show absorption from metastable states of FeII with…
The SDSS Imaging Pipelines
Robert Lupton, James E. Gunn, Zeljko Ivezic +3
We summarise the properties of the Sloan Digital Sky Survey (SDSS) project, discuss our software infrastructure, and outline the architecture of the SDSS image processing pipelines…