论文标题

折叠术中的黑洞超激烈。 iii。 GRB时间尺度

Black hole hyperaccretion in collapsars. III. GRB timescale

论文作者

Wei, Yun-Feng, Liu, Tong

论文摘要

根据观察到的持续时间的双峰分布$ t_ {90} $,将伽马射线爆发(GRB)分为长和短的人群(即LGRB和SGRB)。多通用器观察表明,大多数SGRB和LGRB应由紧凑型物体合并和大规模折叠术中的黑洞(BH)超振动发射的超旧式喷气机提供动力。但是,持续时间标准有时无法正确反映特定GRB的物理起源。在折叠场景中,当射流成功地从信封和偶然介质中脱颖而出时,可以观察到GRB。观察到的GRB持续时间仅反映了发动机突破后发动机运行的时间。这项工作研究了大规模折叠中的中微子歼灭或布兰德福德 - 兹纳杰克机制驱动的喷气机的传播。展出了祖先生产LGRB,SGRB和失败GRB的祖细胞的签名。质量供应到BH超碎屑和射流传播到信封之间的竞争肯定取决于折叠术的密度曲线。我们表明持续时间和各向同性能$ e _ {\ rm {γ,iso}} $的GRB可以帮助限制折叠的密度曲线。最后,我们提出,Collapsar-Origin SGRB GRB 200826a可能起源于中微子宣传为主导的喷气机,由$ \ sim 10〜m_ \ odot $ collapsar发行,其祖先的包膜已被剥离。

Gamma-ray bursts (GRBs) are classified into long and short populations (i.e., LGRBs and SGRBs) based on the observed bimodal distribution of duration $T_{90}$. Multimessenger observations indicated that most SGRBs and LGRBs should be powered by ultrarelativistic jets launched from black hole (BH) hyperaccretion in compact object mergers and massive collapsars, respectively. However, the duration criterion sometimes cannot correctly reflect the physical origin of a particular GRB. In the collapsar scenario, a GRB can be observed when the jet breaks out from the envelope and circumstellar medium successfully. The observed GRB duration reflects only the time that the engine operates after the jet breaks out. This work studies the propagation of jets driven by the neutrino annihilation or Blandford-Znajek mechanism in massive collapsars. The signatures of the progenitors for producing LGRBs, SGRBs, and failed GRBs in the collapsar scenario are exhibited. The competition between the mass supply onto the BH hyperaccretion and jet propagation into the envelope are definitely dependent on the density profiles of the collapsars. We show that duration and isotropic energy $E_{\rm{γ,iso}}$ of GRBs can help constrain the density profiles of collapsars. Finally, we propose that a collapsar-origin SGRB, GRB 200826A, might originate from a neutrino-annihilation-dominated jet launched by a $\sim 10~M_\odot$ collapsar whose progenitor's envelope has been stripped.

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