The Jet Structure and the Intrinsic Luminosity Function of Short Gamma-Ray Bursts

被引：17

作者：

Tan, Wei-Wei ^{[1
,2
]}

Yu, Yun-Wei ^{[3
]}

机构：

[1] Hubei Univ Educ, Sch Phys & Mech Elect Engn, Wuhan 430205, Peoples R China

[2] Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China

[3] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 902卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Gamma-ray bursts; NEUTRON-STAR MERGERS; GRAVITATIONAL-WAVE; SHORT GRBS; AFTERGLOW; COUNTERPARTS; EVOLUTION; BAND; NUCLEOSYNTHESIS; POLARIZATION; EMISSION;

D O I：

10.3847/1538-4357/abb404

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The joint observation of GW170817 and GRB 170817A indicated that short gamma-ray bursts (SGRBs) can originate from binary neutron star mergers. Moreover, some SGRBs could be detected off axis, while the SGRB jets are highly structured. Then, by assuming a universal angular distribution of the jet emission for all SGRBs, we reproduce the flux and redshift distributions of the cosmological SGRBs detected by Swift and Fermi. For self-consistency, this angular distribution is simultaneously constrained by the luminosity and event rate of GRB 170817A. As a result, it is found that the universal jet structure of SGRBs could approximately have a two-Gaussian profile. Meanwhile, the intrinsic luminosity function (LF) of the on-axis emission of the jets can be simply described by a single power law with a low-luminosity exponential cutoff. The usually discovered broken-power-law apparent LF for relatively high luminosities can naturally result from the coupling of the intrinsic LF with the angular distribution of the jet emission, as the viewing angles to the SGRBs are arbitrarily distributed.

引用

页数：8

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