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Chandra Detection of a TypeII Quasar at z=3.288
Daniel Stern, Edward C. Moran, Alison L. Coil +16
We report on observations of a TypeII quasar at redshift z=3.288, identified as a hard X-ray source in a 185 ks observation with the Chandra X-ray Observatory and as a high-redshif…
An X-ray Selected Galaxy Cluster at z=1.11 in the Rosat Deep Cluster Survey
S. A. Stanford, B. P. Holden, P. Rosati +4
We report the discovery of an X-ray luminous galaxy cluster at z =1.11. RDCS J0910+5422 was selected as an X-ray cluster candidate in the ROSAT Deep Cluster Survey on the basis of…
RX J0848+4456: Disentangling a Moderate Redshift Cluster
B. P. Holden, S. A. Stanford, P. Rosati +7
We present a multi-wavelength study of RX J0848+4456, a cluster of galaxies discovered through X-ray emission in the ROSAT Deep Cluster Survey. Our observations consist of WFPC2 im…
A sample of 6C radio sources designed to find objects at redshift > 4: II --- spectrophotometry and emission line properties
Matt J. Jarvis, Steve Rawlings, Mark Lacy +7
(Abridged) This is the second in a series of three papers which present and interpret basic observational data on the 6C* 151-MHz radio sample: a low-frequency selected sample whic…
Serendipitously Detected Galaxies in the Hubble Deep Field
Steve Dawson, Daniel Stern, Andrew J. Bunker +2
We present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the Hubble Deep Field North (HDF) and its environs. Among the identi…
The Farthest Known Supernova: Support for an Accelerating Universe and a Glimpse of the Epoch of Deceleration
Adam G. Riess, Peter E. Nugent, Brian P. Schmidt +16
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. SN 1997ff, was discovered in a repeat observat…
The Large Area Lyman Alpha Survey
James E. Rhoads, Sangeeta Malhotra, Arjun Dey +3
The Lyman- line is expected to be strong in the presence of active star formation and the absence of dust, making it a good tool for finding chemically primitive galaxies in the…