The Jet Opening Angle and Event Rate Distributions of Short Gamma-Ray Bursts from Late-time X-Ray Afterglows-猫眼课题宝

DOI：

10.3847/1538-4357/acf830

发表时间：

2022-10

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

A. R. Escorial;W. Fong;E. Berger;T. Laskar;R. Margutti;G. Schroeder;J. Rastinejad;D. Cornish;Sarah Popp;Maura Lally;A. Nugent;K. Paterson;B. Metzger;R. Chornock;K. Alexander;Y. Cendes;T. Eftekhari

我们利用钱德拉和xmm -牛顿望远镜对29个短伽马射线暴（SGRBs）进行了综合研究，这些短伽马射线暴在爆发后约0.8−60天被观测到。我们提供了SGRB喷流开口角和真实事件速率的推断分布，以与中子星合并速率进行比较。我们对它们的余辉进行了统一的分析和建模，获得了10个开口角测量值和19个下限。我们报道了两个新的开口角测量值（SGRBs 050724A和200411A）和8个更新值，得到中值< θ j >≈6。°1(−3。°2 + 9。°3]（对整个分布的置信度为68%）。对于其余的事件，我们推断θ j≤0°5-26°。我们发现了一群喷流较宽的sgrb，喷流为θ j￣10°（包括两次θ j￣15°的测量），占我们样本的28%。结合多波长余辉信息，我们得到了总真能量< etrue, to>≈1049-1050 erg，这与磁流体动力射流发射机制一致。此外，我们确定了波束校正事件率Rtrue≈360−1800 Gpc−3 yr−1的范围，该范围由低端包含大量宽射流和高端单独的射流测量确定。通过与最新的合并速率的比较，我们的结果与大多数源自双中子星合并的sgrb一致。然而，我们推断的速率远高于最新的中子星-黑洞合并速率，这与源自此类合并的sgrb的一小部分最多是一致的。

We present a comprehensive study of 29 short gamma-ray bursts (SGRBs) observed ≈0.8−60 days postburst using Chandra and XMM-Newton. We provide the inferred distributions of the SGRB jet opening angles and true event rates to compare against neutron star merger rates. We perform a uniform analysis and modeling of their afterglows, obtaining 10 opening angle measurements and 19 lower limits. We report on two new opening angle measurements (SGRBs 050724A and 200411A) and eight updated values, obtaining a median value of 〈θ j〉 ≈ 6.°1 [−3.°2, +9.°3] (68% confidence on the full distribution) from jet measurements alone. For the remaining events, we infer θ j ≳ 0.°5–26°. We uncover a population of SGRBs with wider jets of θ j ≳ 10° (including two measurements of θ j ≳ 15°), representing ∼28% of our sample. Coupled with multiwavelength afterglow information, we derive a total true energy of 〈E true,tot〉 ≈ 1049–1050 erg, which is consistent with magnetohydrodynamic jet launching mechanisms. Furthermore, we determine a range for the beaming-corrected event rate of Rtrue≈360−1800 Gpc−3 yr−1, set by the inclusion of a population of wide jets on the low end, and the jet measurements alone on the high end. From a comparison with the latest merger rates, our results are consistent with the majority of SGRBs originating from binary neutron star mergers. However, our inferred rates are well above the latest neutron star–black hole merger rates, consistent with at most a small fraction of SGRBs originating from such mergers.

The Jet Opening Angle and Event Rate Distributions of Short Gamma-Ray Bursts from Late-time X-Ray Afterglows

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