Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-28
Astrophys. J. 685 (2008) 354-360
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, 1 table, now matches the editorially revised version; accepted for publication in ApJ (vol 685);
Scientific paper
10.1086/590903
An important concern in the application of gamma-ray bursts (GRBs) to cosmology is that the calibration of GRB luminosity/energy relations depends on the cosmological model, due to the lack of a sufficient low-redshift GRB sample. In this paper, we present a new method to calibrate GRB relations in a cosmology-independent way. Since objects at the same redshift should have the same luminosity distance and since the distance moduli of Type Ia supernovae (SNe Ia) obtained directly from observations are completely cosmology independent, we obtain the distance modulus of a GRB at a given redshift by interpolating from the Hubble diagram of SNe Ia. Then we calibrate seven GRB relations without assuming a particular cosmological model and construct a GRB Hubble diagram to constrain cosmological parameters. From the 42 GRBs at $1.4
Liang Nan
Liu Yuan
Xiao Wei Ke
Zhang Shuang Nan
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