Yonetoku, Daisuke 2012 重做Ep-Lp和Ep-Eiso关系

主要内容:
用了101个暴。
和上一篇文章是同一拨人。

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Title:		Possible Origins of Dispersion of the Peak Energy-Brightness Correlations of Gamma-Ray Bursts
Authors:		Yonetoku, Daisuke; Murakami, Toshio; Tsutsui, Ryo; Nakamura, Takashi; Morihara, Yoshiyuki; Takahashi, Keitaro
Affiliation:		AA(Department of Physics, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192 yonetoku@astro.s.kanazawa-u.ac.jp), AB(Department of Physics, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192), AC(Department of Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502), AD(Department of Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502), AE(Department of Physics, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192), AF(Department of Physics and Astrophysics, Nagoya University, Fro-cho, Chikusa-ku, Nagoya 464-8602)
Publication:		Publications of the Astronomical Society of Japan, Vol.62, No.6, pp.1495--1507 (PASJ Homepage)
Publication Date:		12/2010
Origin:		PASJ
Astronomy Keywords:		gamma rays: bursts, gamma rays: cosmology, gamma rays: observations
Abstract Copyright:		(c) 2010: Astronomical Society of Japan
Bibliographic Code:		2010PASJ...62.1495Y

Abstract

We collected and reanalyzed about 200 GRB data of prompt-emission with known redshift observed until the end of 2009, and selected 101 GRBs that were well-observed to have good spectral parameters in order to determine the spectral peak energy (E_p) 1-second peak luminosity (L_p) and isotropic energy (E_iso). Using our newly constructed database with 101 GRBs, we first revised the E_p-L_p and E_p-E_iso correlations. The correlation coefficients of the revised correlations were 0.889 for 99 degrees of freedom for the E_p-L_p correlation and 0.867 for 96 degrees of freedom for the E_p-E_iso correlation. These values correspond to a chance probability of 2.18 × 10^-35 and 4.27 × 10^-31, respectively. It is a very important issue whether these tight correlations are an intrinsic property of GRBs, or are caused by some selection effect of observations. In this paper, we examine how the truncation of the detector sensitivity affects the correlations, and conclude they are surely intrinsic properties of GRBs. Next we investigate origins of the dispersion of the correlations by studying their brightness and redshift dependence. Here, the brightness (flux or fluence) dependence would be regarded as being an estimator of the bias due to the detector threshold. We found a weak fluence-dependence in the E_p-E_iso correlations and a redshift dependence in the E_p-L_p correlation both at the 2σ statistical level. These two effects may contribute to the dispersion of the correlations, which is larger than the statistical uncertainty. We discuss a possible reason of these dependences and give a future prospect to improve the correlations.

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