Cosmography by GRBs

Details Cosmography by GRBs Cosmography by GRBs

2008-06-06

arxiv.org/abs/0806.1120v3

Astronomy and Astrophysics Volume 490, Issue 1, October 2008, Pages 31-36

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures

Scientific paper

10.1051/0004-6361:200810337

Relations connecting gamma ray burst quantities can be used to constrain cosmographic parameters of the Hubble law at medium-high redshifts. We consider a sample of 27 gamma ray bursts to construct the luminosity distance to redshift relation and derive the values of the parameters $q_0$, $j_0$, and $s_0$. The analysis is compared with other methods in the literature. gamma gay bursts, if calibrated by SNeIa, seem reliable as distance indicators and give cosmographic parameters in agreement with the $\Lambda$CDM model.

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