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The Deepest Spectrum of the Universe? Constraints on the Lyman Continuum Background at High Redshift
Andrew J. Bunker, Francine R. Marleau, James R. Graham
We describe an ongoing experiment to search for the meta-galactic Lyman-continuum background at z~2-3. We are obtaining one of the deepest optical spectra ever, using LRIS/Keck-II…
A Serendipitous Search for Hy-Redshift Ly Emission: A Case Study of Two Sources at
Curtis Manning, Daniel Stern, Hyron Spinrad +1
In the course of our on-going search for serendipitous high-redshift LyA emission in deep archival Keck spectra, we discovered two LyA emission line candidates in a moderate disper…
Resolving the Stellar Populations in a z=4 Lensed Galaxy
Andrew J. Bunker, Leonidas A. Moustakas, Marc Davis
We present deep near-infrared Keck/NIRC imaging of a recently-discovered z=4.04 galaxy (Frye & Broadhurst 1998). This is lensed by the rich foreground cluster Abell~2390 (z~0.23) i…
Limits on the star formation rates of z>2 damped Ly-alpha systems from H-alpha spectroscopy
Andrew J. Bunker, Stephen J. Warren, D. L. Clements +2
We present the results of a long-slit K-band spectroscopic search for H-alpha emission from eight damped Ly-alpha absorbers (DLAs) at z>2 with the goal of measuring the star-format…
Optical spectroscopy of two overlapping, flux-density-limited samples of radio sources in the North Ecliptic Cap, selected at 38 MHz and 151 MHz
Mark Lacy, Steve Rawlings, Gary J. Hill +3
We present the results of optical spectroscopy of two flux-density-limited samples of radio sources selected at frequencies of 38 and 151 MHz in the same region around the North Ec…
The unusual afterglow of GRB 980326: evidence for the gamma-ray burst/supernova connection
J. S. Bloom, S. R. Kulkarni, S. G. Djorgovski +19
Cosmic gamma-ray bursts (GRBs) have been firmly established as one of the most powerful phenomena in the Universe, releasing electromagnetic energy approaching the rest-mass energy…