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arXiv 2602.05587astro-ph.HE
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探索伽马射线暴的中央引擎:从即时光曲线出发

Exploring the central engines of gamma-ray bursts from prompt light curves

Qufu Normal University(曲阜师范大学);Huazhong University of Science and Technology(华中科技大学);Xiamen University(厦门大学);Anhui Normal University(安徽师范大学);Nanchang University(南昌大学);Nanjing University(南京大学)

Xue Zhang, Shuang-Xi Yi, Wei-Hua Lei, Tong Liu, Yu-Peng Yang, Ying Qin, Yan-Kun Qu, Qing-Wen Tang, Fa-Yin Wang

AI总结:

通过分析GRB光曲线的亮度衰减斜率,区分BZ过程和NDAF机制,发现15个符合BZ机制,22个支持NDAF机制,多数事件斜率在2-4之间,表明存在混合机制,NDAF占主导。

摘要:

超高速恒星级黑洞系统是伽马射线暴(GRB)中心引擎的领先候选者。其喷流被认为由布兰登福-赞杰克(BZ)过程或中微子主导的吸积流(NDAF)驱动,但区分这两种机制仍具挑战性。为此,我们提出利用GRB光曲线的亮度衰减斜率(参数d)来区分BZ和NDAF机制,从而将光曲线形态与中心引擎物理联系起来。通过分析Swift/BAT观测到的85个单峰GRB(具有快速上升、指数衰减(FRED)特征)的64毫秒背景校正光曲线,我们使用经验性的Kocevski-Ryde-Liang(KRL)函数拟合衰减斜率(参数d),并与BZ(d约1.67)和NDAF(d约3.7到7.8)的理论预测进行比较。我们发现,衰减斜率(参数d)可以区分中心引擎机制,其中15个GRB符合BZ机制,22个支持NDAF机制。然而,大多数事件的斜率在2到4之间,表明存在混合机制,NDAF占主导。

英文摘要:

Hyperaccreting stellar-mass black hole systems are leading candidates for the central engines of gamma-ray bursts (GRBs). Their jets are thought to be powered by either the Blandford-Znajek (BZ) process or neutrino-dominated accretion flows (NDAFs), but discriminating between these mechanisms remains challenging. To address this, we propose using the luminosity decay slope (parameter d) of GRB light curves to distinguish between the BZ and NDAF mechanisms, thereby linking the light-curve morphology to the central engine physics. By analysing 85 single-peaked GRBs with fast-rise, exponential-decay (FRED) profiles observed by Swift/BAT using 64 ms background-subtracted light curves, we fit the decay slope (parameter d) with the empirical Kocevski-Ryde-Liang (KRL) function and compare the results with theoretical predictions for the BZ (d approximately 1.67) and the NDAF (d approximately 3.7 to 7.8) mechanisms. We find that the decay slope (parameter d) can differentiate central engine mechanisms, with 15 GRBs consistent with the BZ mechanism and 22 supporting the NDAF mechanism. However, most events exhibit slopes within the range between 2 and 4, suggesting a hybrid of mechanisms, with NDAF being dominant.

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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