Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-07-10
Astronomy and Astrophysics
Astrophysics
38 pages with embedded figures. To appear in ApJ on Sept. 20, 1997. Minor errors corrected August 16, 1997
Scientific paper
10.1086/304585
The cosmological expansion cannot produce the reported correlations of the gamma-ray burst timescale and spectral energy with peak flux if the burst model reproduces the BATSE 3B peak-flux distribution for a non-evolving burst source density. Power law luminosity distribution models proportional to L^{-beta} produce acceptables fits to the data for most values of the spectral parameters when beta < 1.6. In this model, gamma-ray bursts of a given peak flux have a distribution of redshifts, with a maximum redshift of > 3 for peak fluxes near the BATSE threshold, and with an average redshift of < 1 for all values of peak flux. The reported correlations of the burst timescale and the spectral energy with peak flux are systematically 1 standard deviation above the monoluminous model and 1.5 to 2 standard deviation above the power-law luminosity model. These results suggest that an intrinsic correlation of burst timescale and spectral energy with luminosity is present.
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