7 papers
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…
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…
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…
Infrared Colors of L and T Dwarfs
S. K. Leggett, D. A. Golimowski, X. Fan +2
We discuss the behaviour of the JHKL'M' colors of L and T dwarfs, based on photometric and spectroscopic data obtained at the United Kingdom Infrared Telescope in Hawaii. We have m…
Infrared Classification of L and T Dwarfs
T. R. Geballe, G. R. Knapp, S. K. Leggett +2
We use new and published medium resolution 0.6--2.5 m spectra of L and T dwarfs to develop a unified classification system for both of these new spectral classes. Two indices of…
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…