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Identifying the Reionization Redshift from the Cosmic Star Formation Rate
(American Astronomical Society, 2000)
We show that the cosmic star formation rate per comoving volume should exhibit a distinct drop around the reionization redshift, when the H II regions in the intergalactic medium around individual ionizing sources first ...
Variability of Gamma‐Ray Burst Afterglows due to Interstellar Turbulence
(American Astronomical Society, 2000)
Gamma-ray burst (GRB) afterglows are commonly interpreted as synchrotron emission from a relativistic blast wave produced by a point explosion in an ambient medium, plausibly the interstellar medium of galaxies. We calculate ...
Expected Number and Flux Distribution of Gamma‐Ray Burst Afterglows with High Redshifts
(American Astronomical Society, 2000)
If gamma-ray bursts (GRBs) occur at high redshifts, then their bright afterglow emission can be used to probe the ionization and metal enrichment histories of the intervening intergalactic medium during the epoch of ...
Probing Red Giant Atmospheres with Gravitational Microlensing
(American Astronomical Society, 2000)
Gravitational microlensing provides a new technique for studying the surfaces of distant stars.;Microlensing events are detected in real time and can be followed up with precision photometry and spectroscopy. This method ...
Fluctuations in the Radio Background from Intergalactic Synchrotron Emission
(American Astronomical Society, 2000)
The shocks produced in the intergalactic medium during large-scale structure formation accelerate a population of highly relativistic electrons that emit synchrotron radiation due to intergalactic magnetic fields. In a ...
Resolving Gamma-Ray Burst 000301C with a Gravitational Microlens
(American Astronomical Society, 2000)
Identifying Gamma‐Ray Burst Remnants in Nearby Galaxies
(American Astronomical Society, 2000)
We study the spectral signatures arising from cooling and recombination of an interstellar medium whose equilibrium state has been altered over similar to 100 pc by the radiation of a gamma-ray burst (GRB) and its afterglow. ...
High‐Redshift Galaxies: Their Predicted Size and Surface Brightness Distributions and Their Gravitational Lensing Probability
(American Astronomical Society, 2000)
Direct observations of the first generation of luminous objects will likely become feasible over the next decade. The advent of the Next Generation Space Telescope (NGST) will allow imaging of numerous galaxies and ...