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http://hdl.handle.net/2248/2127
Title: | Limit on the average redshift of Gamma Ray Bursts from evolving galaxies |
Authors: | Jain, D Panchapakesan, N Mahajan, S Bhatia, V. B |
Keywords: | Gravitational lensing Gamma ray bursts Evolution of galaxies |
Issue Date: | 2000 |
Publisher: | Astronomical Society of India |
Citation: | BASI, Vol. 28, No. 2, pp. 377 - 379 |
Abstract: | Identification of gravitationally lensed Gamma Ray Bursts (GRBs) in the BATSE 4B catalog can be used to constrain the average redshift <z> of the GRBs. Here we calculate an upper limit to <z>, independent of the physical model for GRBs, using a filled beam approximation to compute the lensing rate for GRBs at high z for a variety of cosmologies. The upper limit on <z> depends directly on the cosmological parameters ? and ?. The other factor which can change the <z> of GRBs is the evolution of the lensing galaxies. We find that merging of lensing galaxies puts the GRBs at higher redshift as compare to non evolving model of galaxies. |
URI: | http://hdl.handle.net/2248/2127 |
Appears in Collections: | BASI Publications |
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