Curran 2007 X-ray breaks may be hidden in the light curves
主要内容:
By fitting with single power law and breaked power law, the later is good either. So, the broken power law in Swift era may be just hidden in the smooth light curves.
精彩摘抄:
文章信息:
Are the missing X-ray breaks in Gamma-ray Burst afterglow light curves merely hidden?
(Submitted on 28 Oct 2007)
Abstract: Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX, or pre-Swift era. Specifically, relatively few breaks, consistent with jet breaks, are observed in the X-ray light curves of these bursts. If these breaks are truly missing, it has serious consequences for the interpretation of GRB jet collimation and energy requirements, and the use of GRBs as cosmological tools. Here we address the issue of X-ray breaks that are possibly `hidden' and hence the light curves are misinterpreted as being single power laws. We do so by synthesising XRT light curves and fitting both single and broken power laws, and comparing the relative goodness of each fit via Monte Carlo analysis. Even with the well sampled light curves of the Swift era, these breaks may be left misidentified, hence caution is required when making definite statements on the absence of achromatic breaks.
没有评论:
发表评论