Necessity of evolution in cosmological gamma-ray bursts

Details Necessity of evolution in cosmological gamma-ray bursts Necessity of evolution in cosmological gamma-ray bursts

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.357..140f&link_type=abstract

Nature (ISSN 0028-0836), vol. 357, no. 6374, May 14, 1992, p. 140, 141. Research supported by DOE.

Mathematics

Logic

40

Emission Spectra, Gamma Ray Bursts, Red Shift, Faint Objects, Galactic Evolution, Pioneer Venus 1 Spacecraft

Scientific paper

BATSE results show a relative deficiency of faint gamma-ray bursts without any detectable anisotropy, strongly supporting suggestions that the bursts originate at cosmological distance. Pioneer Venus Orbiter (PVO) observations of brighter bursts show no such deficiency, indicating that the burst it sees are at redshifts less than about one. The best-fit cosmological model based on PVO data with no evolution of the source population predicts, when extrapolated to the fainter sources, a factor of 40 or more events than BATSE sees. Even the 3 sigma limit from PVO is barely consistent with the BATSE result. Evolution of the cosmological gamma-ray burst sources with epoch therefore seems necessary if the PVO and BATSE data are to be reconciled. The required evolutionary trend is for fewer or fainter bursts at larger redshift.

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