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Average spectra of massive galaxies in the SDSS
Daniel J. Eisenstein, David W. Hogg, Masataka Fukugita +17
We combine Sloan Digital Sky Survey spectra of 22,000 luminous, red, bulge-dominated galaxies to get high S/N average spectra in the rest-frame optical and ultraviolet (2600A to 70…
Determining the GRB (Redshift, Luminosity)-Distribution Using Burst Variability
Timothy Donaghy, Donald Q. Lamb, Daniel E. Reichart +1
We use the possible Cepheid-like luminosity estimator for the long-duration gamma-ray bursts (GRBs) developed by Reichart et al. (2000) to estimate the intrinsic luminosity, and th…
Determining the Gamma-Ray Burst Rate as a Function of Redshift
Nevin Weinberg, Carlo Graziani, Donald Q. Lamb
We exploit the 14 gamma-ray bursts (GRBs) with known redshifts and the 7 GRBs for which there are constraints on to determine the GRB rate , using a method…
Gamma-Ray Bursts as a Probe of Cosmology
Donald Q. Lamb
We show that, if the long GRBs are produced by the collapse of massive stars, GRBs and their afterglows may provide a powerful probe of cosmology and the early universe.
The Role of Dust in GRB Afterglows
Donald Q. Lamb
We show that the clumpy structure of star-forming regions can naturally explain the fact that 50-70% of GRB afterglows are optically ``dark.'' We also show that dust echos from the…
Localization of GRBs by Bayesian Analysis of Data from the HETE WXM
Carlo Graziani, Donald Q. Lamb, the HETE Science Team
We describe a new method of transient point source localization for coded-aperture X-ray detectors that we have applied to data from the HETE Wide-Field X-Ray Monitor (WXM). The me…