Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.0302m&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #03.02; Bulletin of the American Astronomical Society, Vol. 31, p.825
Astronomy and Astrophysics
Astronomy
Scientific paper
Can any spatial distribution of gamma-ray bursts (GRBs) fit the measured optical transient redshifts, Log N =96 Log P, duration distribution, and hardness distribution? In an effort to answer this question, we have created a Monte Carlo code that simulates a universe filled with GRBs. We model potential GRB luminosity distributions, cosmologies, density evolution, spectral diversity, and the duration distribution. We find that large time-dilation factors ( > 2.5) are difficult to mimic for a wide range of luminosity distributions, and for different cosmic star formation scenarios. However, trigger selection effects, which include in the sample essentially all bright bursts -- regardless of pulse and duration timescales -- but exclude bursts with shorter temporal structures, were not accounted for in previous time-dilation measurements. We will present results which attempt to correct for this additional selection effect and compare with current modeling. Attributes of the code and further implications will be discussed.
Bonnell Jerry T.
Marani Gabriela Fabiana
Nemiroff Robert J.
Norris Jay P.
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