Open AccessProbing the existence of the E peak – E iso correlation in long gamma ray bursts
Author(s) -
Ghirlanda Giancarlo,
Ghisellini Gabriele,
Firmani Claudio
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2005.00053.x
Subject(s) - gamma ray burst , redshift , astrophysics , physics , luminosity , log normal distribution , rest frame , energy (signal processing) , jet (fluid) , distribution (mathematics) , isotropy , optics , statistics , mechanics , mathematics , mathematical analysis , quantum mechanics , galaxy
We probe the existence of the E peak – E iso correlation in long gamma‐ray bursts (GRBs) using a sample of 442 BATSE bursts with known E peak and with redshift estimated through the lag–luminosity correlation. This sample confirms that the rest‐frame peak energy is correlated with the isotropic equivalent energy. The distribution of the scatter of the points around the best‐fitting line is similar to that obtained with the 27 bursts with spectroscopic redshifts. We interpret the scatter in the E peak – E iso plane as due to the opening angle distribution of GRB jets. By assuming that the collimation corrected energy correlates with E peak we can derive the observed distribution of the jet opening angles, which turns out to be lognormal with a peak value of .