论文标题
射流结构和短伽马射线爆发的内在光度函数
The jet structure and the intrinsic luminosity function of short gamma-ray bursts
论文作者
论文摘要
GW170817和GRB 170817a的联合观察表明，短伽马射线爆发（SGRB）可以源自二元中子星星合并。此外，可以检测到某些SGRB，而SGRB喷气机的结构很高。然后，通过假设所有SGRB的射流发射的通用角度分布，我们重新生产了{\ it swift}和{\ it fermi}检测到的宇宙学SGRB的通量和红移分布。对于自隔离，这种角度分布同时受到GRB 170817A的光度和事件速率的限制。结果，发现SGRB的通用射流结构大约具有两个高斯的轮廓。同时，可以简单地通过具有低亮度指数截止的单个功率定律来简单地描述喷气机上轴发射的内在光度函数（LF）。通常，通常发现的损坏的la被发现的LF对于相对较高的亮度可以自然地是由于固有的LF与射流发射的角度分布的耦合，因为与SGRB的观察角是任意分布的。
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 an universal angular distribution of the jet emission for all SGRBs, we re-produce the flux and redshift distributions of the cosmological SGRBs detected by {\it Swift} and {\it 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.
