Observation and implications of the Epeak - Eiso correlation in Gamma-Ray Bursts
Résumé
The availability of a few dozen GRB redshifts now allows studies of the intrinsic properties of these high energy transients. Amati et al. recently discovered a correlation between Epeak, the intrinsic peak energy of the $\\nu f \\nu$ spectrum, and Eiso, the isotropic equivalent energy radiated by the source. Lamb et al. have shown that HETE-2 data confirm and extend this correlation. We discuss here one of the consequences of this correlation: the existence of a \'spectral standard candle\', which can be used to construct a simple redshift indicator for GRBs.