4 papers
The Antennae Ultraluminous X-Ray Source, X-37, Is A Background Quasar
D. M. Clark, M. H. Christopher, S. S. Eikenberry +8
In this paper we report that a bright, X-ray source in the Antennae galaxies (NGC 4038/9), previously identified as an ultra-luminous X-ray source, is in fact a background quasar.…
A Possible Brown Dwarf Companion to the White Dwarf GD1400
J. Farihi, M. Christopher
An unresolved, likely L dwarf companion to the DA white dwarf GD1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf,…
A Catalog of Young Stellar Groups and Clusters Within 1kpc of the Sun
Alicia Porras, Micol Christopher, Lori Allen +3
We present a catalog of near-infrared surveys of young (<= a few 10^6 yr) stellar groups and clusters within 1 kpc from the Sun, based on an extensive search of the literature from…
The Host Galaxies of Optical Bright QSOs: Molecular Gas in Z < 0.1 PG-QSOs
N. Z. Scoville, D. T. Frayer, E. Schinnerer +1
We present results of a CO(1-0) line survey in a complete sample of 12 low redshift (Z < 0.1), optically bright QSOs (PG QSOs with M_B < -23 mag). Six new CO detections are reporte…