On the environment of short gamma-ray bursts
On the environment of short gamma-ray bursts
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DOI：
10.1111/j.1365-2966.2012.21418.x
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发表时间：
2012-03
影响因子：
4.8
通讯作者：
D. Kopač;D. Kopač;P. D’Avanzo;A. Melandri;S. Campana;A. Gomboc;J. Japelj;M. Bernardini;S. Covino;S. Vergani;R. Salvaterra;Gianpiero Tagliaferri
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文献类型：
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作者：
D. Kopač;D. Kopač;P. D’Avanzo;A. Melandri;S. Campana;A. Gomboc;J. Japelj;M. Bernardini;S. Covino;S. Vergani;R. Salvaterra;Gianpiero Tagliaferri
摘要在本文中，我们提出了一个样本的10个短伽玛射线暴（GRB）与鲁棒的红移测定，发现的雨燕卫星到2011年1月。我们测量它们的X射线吸收柱密度，并收集宿主星系偏移的数据。我们发现了内在吸收的证据，并且内在吸收柱密度与GRB从其宿主星系中心的投影偏移量之间没有相关性。我们发现，具有“亮”和“弱”X射线余辉的短伽玛暴在γ区的性质（T90、亮度和1-s峰值光子能量）可能不利于不同的瞬发机制。宿主星系偏移量与GRB持续时间（T90）不相关.相反，在有效半径归一化的宿主星系偏移量和T90之间存在一种反相关性。最后，我们研究了短寿命和长寿命X射线余辉的短伽玛暴的性质，发现一些短寿命X射线余辉的短寿命伽玛暴具有光学余辉。有鉴于此，X射线余辉持续时间似乎并不是短伽玛暴的特定起源和/或环境的唯一指标。关键词：伽玛射线：暴-X射线：一般
ABSTRACT In this paper we present a sample of 10short gamma–raybursts (GRBs) with a robust redshiftdetermination, discovered by the Swift satellite up to January 2011. We measure their X-rayabsorbing column densities and collect data on the host galaxy offsets. We find evidence forintrinsic absorption and no correlation between the intrinsic absorbing column density andthe projected offset of the GRB from its host galaxy center. We find that the properties inthe gamma regime (T 90 , fluence and 1-s peak photon flux) of short GRBs with “bright” a nd“faint” X-ray afterglow likely disfavour different prompt emission mechanisms. Host galaxyoffset and GRB duration (T 90 ) do not correlate. Instead, there is a hint of anti-correlationbetween the effective radius normalised host galaxy offset and T 90 . Finally, we examine theproperties of short GRBs with short-lived and long-lived X-ray afterglows, finding that someshort GRBs with short-lived X-ray afterglows have their optical afterglow detected. In lightof this, the X-ray afterglow duration does not seem to be an unique indicator of a specificprogenitor and/or environment for short GRBs.Key words: gamma-rays: bursts – X–rays: general