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The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Later
R. L. White, R. H. Becker, M. D. Gregg +11
We have used the VLA FIRST survey and the APM catalog of the POSS-I plates as the basis for constructing a new radio-selected sample of optically bright quasars. This is the first…
The Radio Afterglow and the Host Galaxy of the X-Ray Rich GRB 981226
D. A. Frail, S. R. Kulkarni, J. S. Bloom +9
We report the discovery of a radio transient VLA 232937.2-235553, coincident with the proposed X-ray afterglow for the gamma-ray burst GRB 981226. This GRB has the highest ratio of…
Helium abundance in the most metal-deficient blue compact galaxies: I Zw 18 and SBS 0335-052
Y. I. Izotov, F. H. Chaffee, C. B. Foltz +3
We present high-quality spectroscopic observations of the two most-metal deficient blue compact galaxies known, I Zw 18 and SBS 0335-052 to determine the helium abundance. The unde…
The Lyman-alpha Forest and Heavy Element Systems of GB1759+7539
P. J. Outram, F. H. Chaffee, R. F. Carswell
(abridged) We present observations of the high-redshift QSO GB1759+7539 (z=3.05) obtained with HIRES on the Keck 10m telescope. The spectrum has a resolution of FWHM = 7 km/s, and…
KECK HIRES Spectroscopy of APM 08279+5255
Sara L. Ellison, Geraint F. Lewis, Max Pettini +5
With an optical R-band magnitude of 15.2, the recently discovered z=3.911 BAL quasar APM 08279+5255 is an exceptionally bright high redshift source. Its brightness has allowed us t…
The afterglow, the redshift, and the extreme energetics of the gamma-ray burst 990123
S. R. Kulkarni, S. G. Djorgovski, S. C. Odewahn +26
Afterglow, or long-lived emission, has now been detected from about a dozen well-positioned gamma-ray bursts. Distance determinations made by measuring optical emission lines from…