A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
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DOI：
10.1038/s41550-023-01998-8
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发表时间：
2023-03
期刊：
影响因子：
14.1
通讯作者：
A. Levan;D. Malesani;B. Gompertz;A. Nugent;M. Nicholl;S. Oates;D. Perley;J. Rastinejad;B. Metzger;S. Schulze;E. Stanway;A. Inkenhaag;T. Zafar;J. Feliciano;Ag¨u´ı Fern´andez;A. Chrimes;K. Bhirombhakdi;A. U. Postigo;W. Fong;A. Fruchter;G. Fragione;J. Fynbo;N. Gaspari;K. Heintz;J. Hjorth;P. Jonker;G. Lamb;I. Mandel;S. Mandhai;M. Ravasio;J. Sollerman;N. Tanvir;Grb 191019A
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文献类型：
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作者：
A. Levan;D. Malesani;B. Gompertz;A. Nugent;M. Nicholl;S. Oates;D. Perley;J. Rastinejad;B. Metzger;S. Schulze;E. Stanway;A. Inkenhaag;T. Zafar;J. Feliciano;Ag¨u´ı Fern´andez;A. Chrimes;K. Bhirombhakdi;A. U. Postigo;W. Fong;A. Fruchter;G. Fragione;J. Fynbo;N. Gaspari;K. Heintz;J. Hjorth;P. Jonker;G. Lamb;I. Mandel;S. Mandhai;M. Ravasio;J. Sollerman;N. Tanvir;Grb 191019A
大多数长持续时间（>2秒）的伽马射线暴（GRB）来自大质量恒星的坍缩，一小部分来自致密天体的合并。大多数这些系统通过标准的恒星演化途径形成。然而，一小部分伽玛暴可能是由稠密环境中的动力学相互作用引起的。这些通道也可能对作为引力波源检测到的紧凑物体合并样本有很大贡献。在这里，我们报告了GRB 191019A的情况，这是一个长GRB（持续时间T90 = 64.4 ± 4.5 s），我们精确地定位在一个古老（>1 Gyr）的宿主星系的核附近（投影100 pc），其年龄为0.248。缺乏星星形成的证据和超新星辐射的深度限制不利于大质量星星的起源。最有可能的祖细胞形成的途径是通过在宿主的致密核中的动力学相互作用。在这种情况下，祖先可以是一个紧凑的对象合并器。它们可能形成于致密的核簇中，或者起源于超大质量黑洞周围的气体盘。识别，据我们所知，一个动态产生的伽玛暴的第一个例子表明，这种爆发可能在探测密集的环境和约束引力波种群的动力学分数的作用。
The majority of long-duration (>2 s) gamma-ray bursts (GRBs) arise from the collapse of massive stars, with a small proportion created from the merger of compact objects. Most of these systems form via standard stellar evolution pathways. However, a fraction of GRBs may result from dynamical interactions in dense environments. These channels could also contribute substantially to the samples of compact object mergers detected as gravitational wave sources. Here we report the case of GRB 191019A, a long GRB (a duration ofT90= 64.4 ± 4.5 s), which we pinpoint close (⪅100 pc projected) to the nucleus of an ancient (>1 Gyr old) host galaxy atz= 0.248. The lack of evidence for star formation and deep limits on any supernova emission disfavour a massive star origin. The most likely route for progenitor formation is via dynamical interactions in the dense nucleus of the host. The progenitor, in this case, could be a compact object merger. These may form in dense nuclear clusters or originate in a gaseous disc around the supermassive black hole. Identifying, to the best of our knowledge, a first example of a dynamically produced GRB demonstrates the role that such bursts may have in probing dense environments and constraining dynamical fractions in gravitational wave populations.