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Large Equivalent width Lyman-alpha line emission at z=4.5: young galaxies in a young universe
Sangeeta Malhotra, James Rhoads
The Large Area Lyman Alpha survey has found ~ 150 Lyman-alpha emitters at z=4.5. While stellar models predict a maximum Lyman-alpha equivalent width (EW) of 240 angstrom, 60% of th…
Lyman Alpha Emitters at Redshift z=5.7
James E. Rhoads, Sangeeta Malhotra
Lyman alpha galaxies at high redshifts offer a powerful probe of both the formation of galaxies and the reionization of the intergalactic medium. Lyman alpha line emission is an ef…
Gamma Ray Bursts as Probes of the First Stars
James E. Rhoads
The redshift where the first stars formed is an important and unknown milestone in cosmological structure formation. The evidence linking gamma ray bursts (GRBs) with star formatio…
X-ray Destruction of Dust Along the Line of Sight to Gamma-Ray Bursts
Andrew S. Fruchter, Julian H. Krolik, James E. Rhoads
We show that if all gamma-ray bursts emit X-rays in a way similar to those observed by BeppoSax, much of the extinction along the line of sight in the host galaxy of the burst can…
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…
Evidence For and Against Collimation of Gamma Ray Bursts
James E. Rhoads
The degree to which gamma ray bursts are collimated is now the dominant uncertainty in their energy requirements and event rates. In this review I begin with the reasons for studyi…