The luminosity function and the rate of Swift's Gamma Ray Bursts

Details The luminosity function and the rate of Swift's Gamma Ray Bursts The luminosity function and the rate of Swift's Gamma Ray Bursts

2009-12-03

arxiv.org/abs/0912.0709v2

Mon.Not.Roy.Astron.Soc.406:1944-1958,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Significantly revised version, including a comparison of the GRB rate to new results on the SFR, revisions in response to the

Scientific paper

10.1111/j.1365-2966.2010.16787.x

We invert directly the redshift - luminosity distribution of observed long Swift GRBs to obtain their rate and luminosity function. Our best fit rate is described by a broken power law that rises like (1+z)^2.1{+0.5-0.6} for 03. The local rate is 1.3^{+0.6-0.7} [Gpc^-3 yr^-1]. The luminosity function is well described by a broken power law with a break at L* = 10^52.5{+-0.2}[erg/sec] and with indices alpha = 0.2^{+0.2-0.1} and beta = 1.4^{+0.3-0.6}. The recently detected GRB 090423, with redshift ~8, fits nicely into the model's prediction, verifying that we are allowed to extend our results to high redshifts. While there is a possible agreement with the star formation rate (SFR) for z<3, the high redshift slope is shallower than the steep decline in the SFR for 4

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