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arXiv 2302.07906astro-ph.HE
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结构化射流解释了极端的GRB 221009 A

A structured jet explains the extreme GRB 221009A

B. O'Connor, E. Troja, G. Ryan, P. Beniamini, H. van Eerten, J. Granot, S. Dichiara, R. Ricci, V. Lipunov, J. H. Gillanders, R. Gill, M. Moss, S. Anand, I. Andr… 展开作者

B. O'Connor, E. Troja, G. Ryan, P. Beniamini, H. van Eerten, J. Granot, S. Dichiara, R. Ricci, V. Lipunov, J. H. Gillanders, R. Gill, M. Moss, S. Anand, I. Andreoni, R. L. Becerra, D. A. H. Buckley, N. R. Butler, S. B. Cenko, A. Chasovnikov, J. Durbak, C. Francile, E. Hammerstein, A. J. van der Horst, M. Kasliwal, C. Kouveliotou, A. S. Kutyrev, W. H. Lee, G. Srinivasaragavan, V. Topolev, A. M. Watson, Y. H. Yang, K. Zhirkov

摘要:

长时间的伽马射线暴(GRB)是一种强大的宇宙爆炸,标志着大质量恒星的死亡。其中,GRB 221009A是迄今为止观测到的最明亮的爆发。由于其巨大的能量($E_\textrm{iso}\!\approx$ 10 $^{55}$ erg)和接近($z\!\approx$ 0.15),GRB 221009 A是一个非常罕见的事件,推动了我们理论的极限。我们提出了多波长的观测,涵盖了前三个月的余辉演变。X射线亮度衰减为幂律,斜率为$\approx\!t^{-1.66}$,这与喷射发射的标准预测不一致。我们把这种行为归因于相对论性喷流的浅能量剖面。在其他高能伽玛暴中也观察到类似的趋势,这表明最极端的爆炸可能是由共同的中央发动机发射的结构射流提供动力的。

英文摘要:

Long duration gamma-ray bursts (GRBs) are powerful cosmic explosions, signaling the death of massive stars. Among them, GRB 221009A is by far the brightest burst ever observed. Due to its enormous energy ($E_\textrm{iso}\!\approx$10$^{55}$ erg) and proximity ($z\!\approx$0.15), GRB 221009A is an exceptionally rare event that pushes the limits of our theories. We present multi-wavelength observations covering the first three months of its afterglow evolution. The X-ray brightness decays as a power-law with slope $\approx\!t^{-1.66}$, which is not consistent with standard predictions for jetted emission. We attribute this behavior to a shallow energy profile of the relativistic jet. A similar trend is observed in other energetic GRBs, suggesting that the most extreme explosions may be powered by structured jets launched by a common central engine.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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