Ghirlanda, G. 2011 Fermi暴的E_p随光变的演化

主要内容:
对Fermi的23个暴（11长12短）的分析，发现有相同的行为：E_p和flux正相关；没有从硬到软的演化。

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Title:		Short and long gamma-ray bursts: same emission mechanism?
Authors:		Ghirlanda, G.; Ghisellini, G.; Nava, L.
Affiliation:		AA(INAF - Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy), AB(INAF - Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy), AC(SISSA - via Bonomea 265, I-34136 Trieste, Italy)
Publication:		Monthly Notices of the Royal Astronomical Society: Letters, Volume 418, Issue 1, pp. L109-L113. (MNRAS Homepage)
Publication Date:		11/2011
Origin:		WILEY
Astronomy Keywords:		radiation mechanisms: non-thermal, stars: gamma-ray bursts: general
Abstract Copyright:		© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:		10.1111/j.1745-3933.2011.01154.x
Bibliographic Code:		2011MNRAS.418L.109G

Abstract

We study the spectral evolution on second and subsecond time-scales in 11 long and 12 short gamma-ray bursts (GRBs) with peak flux >8.5 × 10^-6 erg cm^-2 s (8 keV-35 MeV) detected by the Fermi satellite. The peak flux correlates with the time-averaged peak energy in both classes of bursts. The peak energy evolution, as a function of time, tracks the evolution of the flux on short time-scales in both short and long GRBs. We do not find evidence of a hard-to-soft spectral evolution. While short GRBs have observed peak energies larger than few MeV during most of their evolution, long GRBs can start with a softer peak energy (of few hundreds keV) and become as hard as short ones (i.e. with E^obs_peak larger than few MeV) at the peak of their light curve. Six GRBs in our sample have a measured redshift. In these few cases we find that their correlations between the rest frame E_peak and the luminosity L_iso are less scattered than their correlations in the observer frame between the peak energy E^obs_peak and the flux P. We find that the rest frame E_peak of long bursts can be as high or even larger than that of short GRBs and that short and long GRBs follow the same E_peak(t)-L_iso(t) correlation, despite the fact that they likely have different progenitors.

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