Nava 2007 星风环境下的E_p-E_gamma关系 3

主要内容:
在星风环境假设下，Ghirlanda关系变成线性的，E_p正比于E_gamma。其中E_gamma于\theta_j有关，而\theta_j来自于t_j，又与外部环境有关。

精彩摘抄:
二者之间的线性关系。

文章信息:

astro-ph/0701496 [abs, ps, pdf, other] :

Title: Wind circumburst density profile: a linear E_p-E_gamma correlation
Authors: L. Nava (1,2), G. Ghisellini (1), G. Ghirlanda (1), F. Tavecchio (1), C. Firmani (1,3) ((1)INAF-OAB, (2)Univ. Insubria, (3)U.N.A.M.)
Comments: To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9, 2006. To appear in "Il Nuovo Cimento"

Ghirlanda et al. (2004) derived the collimation-corrected energy E_gamma for a sample of 15 bursts under the assumption of a homogeneous circumburst density profile. They found a correlation (the so-called Ghirlanda correlation) between E_gamma and the rest frame peak energy of the nuF_nu prompt spectrum (E_p). Nava et al. (2006) showed that, assuming a circumburst density distribuited with a r^-2 wind profile, the Ghirlanda correlation remains tight and becomes linear. This implies that: i) it remains linear also in the comoving frame, no matter the distribution of bulk Lorentz factors, ii) it entails that different bursts have the same number of relevant photons. We have updated these findings including recently detected bursts (21 in total), stressing the two important implications.