Possible correlations between gamma-ray burst and its host galaxy offset

Possible correlations between gamma-ray burst and its host galaxy offset
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伽马射线暴与其宿主星系偏移之间可能存在的相关性

DOI:
10.1016/j.jheap.2018.03.001
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发表时间:
2018-06
影响因子:
3.8
通讯作者:
Moharana Reetanjali
Moharana Reetanjali
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang Fei Fei;Zou Yuan Chuan;Liu Yu;Liao Bin;Moharana Reetanjali

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我们从文献中收集了304个伽玛暴的信息,并分析了宿主星系偏移量之间的相关性(从伽玛暴所在地到其宿主星系中心的距离),T 90,i(静止帧中的持续时间T 90),T R45,i E γ,iso(各向同性等效能量),L γ,iso(= E γ,iso/T90,i,各向同性等效亮度)和Lpk(峰值亮度)。发现T90,i,TR 45,i,E γ,iso,Lpk与炮检距呈负相关,这与短伽玛暴(SGRB)和长伽玛暴(LGRB)的起源是一致的。在单独分析时,我们发现在SGRB的情况下,log Δ E γ、iso− log Δ E(偏移)和log Δ L pk− log Δ E(偏移)关系也有类似的结果,而在LGRB的情况下,没有明显的关系。炮检距与L γ,iso无相关性。我们还把特殊的GRB 170817 A和GRB 060218 A放在图上。这两个伽玛暴都具有低光度和小偏移。在log-E γ(偏移)-log-T-90,i图中,我们发现GRB 170817 A位于SGRB和LGRB的两个区域之间,在偏移-E γ,iso,偏移-L γ,iso和偏移-L pk图中是异常值。再加上GRB 060218 A在所有图中都是异常值,这表明GRB 170817 A和060218 A的特殊性,并可能意味着GRB样本的更多亚群。
We collected the information of 304 gamma-ray bursts (GRBs) from the literature, and analyzed the correlations among the host galaxy offsets (the distance from the site of the GRB to the center of its host galaxy), T 90, i (the duration T 90 in rest-frame), T R45, i (the duration T R45 in rest-frame), E γ, iso (the isotropic equivalent energy), L γ, iso (= E γ, iso/T 90, i, the isotropic equivalent luminosity) and L pk (peak luminosity). We found that T 90, i, T R45, i, E γ, iso, L pk have negative correlation with offset, which is consistent with origin of short GRBs (SGRBs) and long GRBs (LGRBs). On separate analysis, we found similar results for log⁡ E γ, iso− log⁡(offset) and log⁡ L pk− log⁡(offset) relations in case of SGRBs only, while no obvious relation for LGRBs. There is no correlations between offset and L γ, iso. We also put the special GRB 170817A and GRB 060218A on the plots. The two GRBs both have low luminosity and small offset. In the log⁡(offset)− log⁡ T 90, i plot, we found GRB 170817A locates in between the two regions of SGRBs and LGRBs and it is the outlier in the offset− E γ, iso, offset− L γ, iso and offset− L pk plots. Together with GRB 060218A being an outlier in all plots, it indicates the speciality of GRBs 170817A and 060218A, and might imply more subgroups of the GRB samples.
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