ALMA and GMRT Constraints on the Off-axis Gamma-Ray Burst 170817A from the Binary Neutron Star Merger GW170817-猫眼课题宝

DOI：

10.3847/2041-8213/aa970b

发表时间：

2017-10

期刊：

The Astrophysical Journal Letters

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通讯作者：

中科院分区：

其他

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作者：

Sam Kim;S. Schulze;L. Resmi;J. Gonz'alez-L'opez;A. Higgins;C. Ishwara-Chandra;F. Bauer;I. Gregorio-Monsalvo;M. Pasquale;A. D. U. Postigo;D. A. Kann;S. Mart'in;S. Oates;R. Starling;N. Tanvir;J. Buchner;S. Campana;Z. Cano;S. Covino;A. Fruchter;J. Fynbo;D. Hartmann;J. Hjorth;P. Jakobsson;A. Levan;D. Malesani;M. Michałowski;B. Milvang-Jensen;K. Misra;P. O'Brien;R. S'anchez-Ram'irez;C. Thone;D. Watson;K. Wiersema

双星中子星合并（BNSMs）是激光干涉引力波天文台（LIGO）最容易探测到的引力波（GW）源之一。它们也被认为产生短γ射线暴（SGRB）和由r过程核提供动力的千诺瓦。同时探测这些现象将为两个紧凑物体合并期间和之后的物理学提供前所未有的视角。LIGO/Virgo于2017年8月17日在距离1.44兆秒差距处检测到了这样的罗塞塔石碑事件。我们监测的位置，BNSM与阿塔卡马大型毫米/亚毫米阵列（阿尔马）在338.5 GHz和巨型米波射电望远镜（GMRT）在1.4 GHz，从合并后的1.4至44天。我们的观测排除了任何比这些波段更明亮的余辉，探测比以前的SGRB限制更暗>2-4 dex。我们将这些限制与GW事件后几周内宣布出现X射线和无线电发射的公共数据相匹配，以获得离轴余辉的模板。我们的宽带模型表明，GW 170817伴随着SGRB，并且由erg提供动力的γ射线爆发（GRB）喷流具有半张角，并且偏离我们的视线。这些数据也与更平行的射流一致：erg，。这是迄今为止对离轴GRB余辉的最有说服力的探测，也是第一次与BNSM-GW事件相关。我们使用的视角估计来推断的初始散装洛伦兹因子和真正的能量释放的爆发。

Binary neutron-star mergers (BNSMs) are among the most readily detectable gravitational-wave (GW) sources with the Laser Interferometer Gravitational-wave Observatory (LIGO). They are also thought to produce short γ-ray bursts (SGRBs) and kilonovae that are powered by r-process nuclei. Detecting these phenomena simultaneously would provide an unprecedented view of the physics during and after the merger of two compact objects. Such a Rosetta Stone event was detected by LIGO/Virgo on 2017 August 17 at a distance of ∼44 Mpc. We monitored the position of the BNSM with Atacama Large Millimeter/submillimeter Array (ALMA) at 338.5 GHz and the Giant Metrewave Radio Telescope (GMRT) at 1.4 GHz, from 1.4 to 44 days after the merger. Our observations rule out any afterglow more luminous than in these bands, probing >2–4 dex fainter than previous SGRB limits. We match these limits, in conjunction with public data announcing the appearance of X-ray and radio emission in the weeks after the GW event, to templates of off-axis afterglows. Our broadband modeling suggests that GW170817 was accompanied by an SGRB and that the γ-ray burst (GRB) jet, powered by erg, had a half-opening angle of , and was misaligned by from our line of sight. The data are also consistent with a more collimated jet: erg, . This is the most conclusive detection of an off-axis GRB afterglow and the first associated with a BNSM-GW event to date. We use the viewing angle estimates to infer the initial bulk Lorentz factor and true energy release of the burst.

ALMA and GMRT Constraints on the Off-axis Gamma-Ray Burst 170817A from the Binary Neutron Star Merger GW170817

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