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Observations and Theoretical Implications of the Large Separation Lensed Quasar SDSS J1004+4112
M. Oguri, N. Inada, C. R. Keeton +25
We study the recently discovered gravitational lens SDSS J1004+4112, the first quasar lensed by a cluster of galaxies. It consists of four images with a maximum separation of 14.62…
Detection of Intergalactic HeII Absorption at Redshift 3.5
W. Zheng, K. Chiu, S. F. Anderson +5
The large number of quasars found in the Sloan Digital Sky Survey has allowed searches for elusive, clear lines of sight towards HeII Ly-alpha absorption, a sensitive probe of the…
Faint Galaxies in deep ACS observations
N. Benitez, H. Ford, R. Bouwens +33
We present the analysis of the faint galaxy population in the Advanced Camera for Surveys (ACS) Early Release Observation fields VV 29 (UGC 10214) and NGC 4676. Here we attempt to…
The First Data Release of the Sloan Digital Sky Survey
The SDSS collaboration, Kevork Abazajian
The Sloan Digital Sky Survey has validated and made publicly available its First Data Release. This consists of 2099 square degrees of five-band (u, g, r, i, z) imaging data, 186,2…
Discovery of Two Distant Type Ia Supernovae in the Hubble Deep Field North with the Advanced Camera for Surveys
John P. Blakeslee, Zlatan I. Tsvetanov, Adam G. Riess +30
We present observations of the first two supernovae discovered with the recently installed Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. The supernovae were foun…