Amati2006 Swift暴的E_p-E_iso关系

主要内容:


精彩摘抄:


文章信息:

astro-ph/0611189 [abs, ps, pdf, other] :

Title: Swift GRBs and the Ep,i - Eiso correlation
Authors: L. Amati
Comments: 6 pages, 3 figures, submitted to Il Nuovo Cimento C (proceedings of "SWIFT and GRBs: Unveiling the Relativistic Universe", June 5-9, 2006 Venice (Italy)

The Ep,i - Eiso correlation is one of the most intriguing and debated observational evidences in Gamma-Ray Bursts (GRB) astrophysics. Swift, with its high sensitivity and fast pointing capabilities, is reducing a lot the impact of selection effects in the sample of GRBs with known redshift (and thus Ep,i and Eiso). Moreover, in several cases it allows the detection of the soft tail of the prompt emission, and thus a more accurate estimate of Ep,i with respect to previous satellites. I present and discuss the location in the Ep,i - Eiso plane of Swift GRBs with known redshift and estimated Ep,i, showing that all long events (including peculiar events like GRB060218 and GRB060614) are consistent with the Ep,i - Eiso correlation. In contrast, short GRBs are not consistent with it, an evidence further supporting the hypothesis of different emission mechanisms at work in the two classes of GRBs. I also show, and briefly discuss, the intriguing evidence that the soft tail of the short GRB050724 is consistent with the correlation.