Are Gamma-Ray Bursts Standard Candles?

Details Are Gamma-Ray Bursts Standard Candles? Are Gamma-Ray Bursts Standard Candles?

2007-05-30

arxiv.org/abs/0705.4401v1

Astronomy and Astrophysics

Astrophysics

4 pages, including 4 figures. To appear in the proceedings of "070228: The Next Decade of GRB afterglows", Amsterdam, 19-23 Ma

Scientific paper

By dividing a sample of 48 long-duration gamma-ray bursts (GRBs) into four groups with redshift from low to high and fitting each group with the Amati relation log Eiso = a + b log Epeak, I find that parameters a and b vary with the mean redshift of the GRBs in each group systematically and significantly. The results suggest that GRBs evolve strongly with the cosmic redshift and hence are not standard candles.

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