Volume 519, September 2010
|Number of page(s)||6|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 September 2010|
A cosmographic calibration of the Ep,i – Eiso (Amati) relation for GRBs
Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Compl. Univ. Monte S. Angelo, Ed. N, via Cinthia, 80126 Napoli, Italy e-mail: email@example.com
2 INFN Sez. di Napoli, Compl. Univ. Monte S. Angelo, Ed. N, via Cinthia, 80126 Napoli, Italy
3 ICRANet and ICRA, Piazzale della Repubblica 10, 65122 Pescara, Italy
4 Dip. di Fisica, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
Accepted: 4 June 2010
Aims. The Amati relation, which connects the isotropic energy emitted and the rest-frame peak energy of the νFν spectra of GRBs, is cosmology-dependent, so we need a method to obtain an independent calibration of the Amati relation.
Methods. Using the Union Supernovae Ia catalog, we obtain a cosmographic luminosity distance in the y-redshift and verify that this parameterization very well approximates the fiducial standard cosmological model ΛCDM. Using this cosmographic luminosity distance dl, we compute the Amati relation considering this cosmology-independent definition of dl.
Results. The cosmographic Amati relation we obtain agrees in the errors with other cosmology-independent calibrations proposed in the literature.
Key words: distance scale / cosmological parameters / gamma-rays bursts: general
© ESO, 2010
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