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Astrometric Redshifts for Quasars
Michael C. Kaczmarczik, Gordon T. Richards, Sajjan S. Mehta +1
The wavelength dependence of atmospheric refraction causes differential chromatic refraction (DCR), whereby objects imaged at different optical/UV wavelengths are observed at sligh…
SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
II SEGUE Collaboration, Brian Yanny, Constance Rockosi +2
The SEGUE survey obtained 240,000 moderate resolution (R = 1800) spectra from 3900 - 9000 Angstroms of fainter Milky Way stars (14.0 < g < 20.3) of a wide variety of spectral types…
X-ray Insights into the Nature of Weak Emission-Line Quasars at High Redshift
Ohad Shemmer, W. N. Brandt, Scott F. Anderson +5
We present Chandra observations of nine high-redshift quasars (z=2.7-5.9) discovered by the Sloan Digital Sky Survey with weak or undetectable high-ionization emission lines in the…