Cosmography by gamma ray bursts
Abstract
Aims: Relations connecting gamma ray burst quantities can be used to constrain cosmographic parameters of the Hubble law at medium-high redshifts.
Methods: 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.
Results: Gamma gay bursts, if calibrated by SNeIa, seem reliable as distance indicators and give cosmographic parameters in agreement with the ΛCDM model.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 2008
- DOI:
- 10.1051/0004-6361:200810337
- arXiv:
- arXiv:0806.1120
- Bibcode:
- 2008A&A...490...31C
- Keywords:
-
- gamma rays: bursts;
- cosmology: cosmological parameters;
- cosmology: distance scale;
- Astrophysics
- E-Print:
- 6 pages, 2 figures