Luminosity function and cosmological evolution of gamma-ray bursts

Mathematics – Logic

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, Observational Cosmology

Scientific paper

The so-called log N-log S relations of GRBs are analyzed in terms of the logarithmic slope of the cumulative counts using a new method which accounts for selection biases. The results are compared with the predictions of cosmological models with a finite range, power-law luminosity function and with pure density and luminosity evolution laws that scale as a power of (1+z). We discuss the limits that may be placed on the range of luminosities and on the evolution.

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