Butler 2008 GRB统计关系中的选择效应

主要内容:
重点检查了Amati关系E_p-E_iso的选择效应。并说Girlanda关系是没有意义的。

精彩摘抄:
Swift和HETE-II及其他卫星的点在不同的区域

Girlanda关系，黑色的是真实红移，红色的是随机红移，但都不影响关系的致密性，说明关系不依赖于红移，进一步说明关系无意义。

文章信息:

· arXiv e-print (arXiv:0802.3396)

· References in the Article

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Title:		Tests for Selection Effects in GRB High-Energy Correlations
Authors:		Butler, Nathaniel R.; Kocevski, Daniel; Bloom, Joshua S.
Publication:		eprint arXiv:0802.3396
Publication Date:		02/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		4 pages, 4 figures, submitted to ApJ
Bibliographic Code:		2008arXiv0802.3396B

Abstract

Several correlations among observables derived from modelling the high-energy properties of GRBs have been reported in the literature. We show that well-known examples of these have common features indicative of an origin in selection effects. In particular, we focus here on the possible origin of the $E_{\rm pk}$-$E_{\rm iso}$ correlation in Swift data due to detector threshold truncation. The existence of faint Swift events calls into question inferences based on pre-Swift surveys which must be subject to complicated incompleteness effects. We review methods for treating data truncation effects in correlation analyses and apply these methods to Swift and pre-Swift data. Also, we show that the $E_{\rm pk}$-$E_{\gamma}$ ("Ghirlanda") correlation is effectively independent of the GRB redshifts, which suggests it contains little intrinsic physics. We recommend verifying that a correlation has significantly reduced scatter in the rest frame relative to the observer frame and also establishing that GRB redshifts contribute meaningfully.

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