Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-Ray Afterglow

Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-Ray Afterglow
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X射线余辉中平台相伽马射线暴的统计研究

DOI:
10.3847/1538-4365/ab4711
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发表时间:
2019-05
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
Zhang Zhi-Bin
Zhang Zhi-Bin
中科院分区:
其他
文献类型:
--
作者:
Tang Chen-Han;Huang Yong-Feng;Geng Jin-Jun;Zhang Zhi-Bin

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在伽马射线暴 (GRB) 的很大一部分中观察到 X 射线余辉的平台期。此前,我们发现关于平台期的三个关键参数之间存在相关性,即GRB静止坐标中平台期的结束时间(Ta)、结束时间对应的X射线光度(LX)和瞬发GRB的各向同性能量(Eγ,iso)。在这项研究中,我们系统地搜索了所有在 2005 年 5 月至 2018 年 8 月之间发生平稳期的雨燕暴。我们收集了 174 个伽玛暴,所有这些都具有红移。对于整个样本,LX、Ta和Eγ,iso之间的相关性得到证实,最佳拟合关系为 。这种更新的三参数相关性仍然支持GRB之后的中心剩余物可能是毫秒磁星。请注意,我们样本中持续时间小于 2 秒的短伽玛暴也遵循相同的相关性,这暗示两颗中子星的合并产物可能是一颗高质量磁星,但不一定是黑洞。此外,具有“内部”平台(即随后的衰变指数通常小于-3)的伽玛暴也遵循这种相关性。它进一步强化了这样的观点,即内部平台是由于高质量中子星延迟塌缩成黑洞而造成的。更新后的三参数相关性表明,具有平台期的伽玛暴可以作为宇宙学研究的标准烛光。
A plateau phase in the X-ray afterglow is observed in a significant fraction of gamma-ray bursts (GRBs). Previously, a correlation among three key parameters concerning the plateau phase is found to exist, i.e., the end time of the plateau phase in the GRB rest frame (Ta), the corresponding X-ray luminosity at the end time (LX) and the isotropic energy of the prompt GRB (Eγ,iso). In this study, we systematically search through all the Swift GRBs with a plateau phase that occurred between 2005 May and 2018 August. We collect 174 GRBs, with redshifts available for all of them. For the whole sample, the correlation between LX, Ta, and Eγ,iso is confirmed, with the best-fit relation being . Such an updated three-parameter correlation still supports that the central leftover after GRBs is probably a millisecond magnetar. Note that short GRBs with durations less than 2 s in our sample also follow the same correlation, which hints that the merger production of two neutron stars could be a high-mass magnetar but not necessarily a black hole. Moreover, GRBs with an “internal” plateau (i.e., with a following decay index being generally smaller than −3) also obey this correlation. It further strengthens the idea that the internal plateau is due to the delayed collapse of a high-mass neutron star into a black hole. The updated three-parameter correlation indicates that GRBs with a plateau phase may act as a standard candle for cosmology study.
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发表时间: 2000-11
期刊: The Astrophysical Journal Letters
影响因子: --
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DOI: 10.1111/j.1365-2966.2011.18961.x
发表时间: 2011-04
影响因子: 4.8
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