Mon. Not. R. Astron. Soc., 492, 1919-1936 (2020/February-3)
The Ep,i-Eiso correlation: type I gamma-ray bursts and the new classification method.
MINAEV P.Y. and POZANENKO A.S.
Abstract (from CDS):
We present the most extensive sample of 45 type I (short) and 275 type II (long) gamma-ray bursts (GRBs) with known redshift to investigate the correlation between the rest-frame peak energy, Ep,i and the total isotropic equivalent energy, Eiso of the prompt emission (Amati relation). The Ep,i-Eiso correlation for type I bursts is found to be well distinguished from the one constructed for type II bursts and has a similar power-law index value, Ep,i∝Eiso∼0.4, which possibly indicates the same emission mechanism of both GRB types. We show that the initial pulse complex (IPC) of type I bursts with an extended emission and regular type I bursts follow the same correlation. We obtain similar results for type II bursts associated with Ic supernovae and for regular type II bursts. Three possible outliers from the Ep,i-Eiso correlation for type II subsample are detected. Significant evolution of the Ep,i-Eiso correlation with redshift for type II bursts is not found. We suggest the new classification method, based on the Ep,i-Eiso correlation and introduce two parameters, EH = Ep,i,2 Eiso,51–0.4 and EHD = Ep,i,2 Eiso,51–0.4 T90,i–0.5, where Ep,i,2 is the value of Ep,i parameter in units of 100 keV, Eiso,51 is the value of Eiso parameter in units of 1051 erg, and T90,i is the rest-frame duration in units of seconds. EHD is found to be the most reliable parameter for the blind type I/type II classification, which can be used to classify GRBs with no redshift.
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
methods: data analysis - methods: statistical - catalogues - gamma-ray bursts - neutron star mergers - transients: supernovae
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