arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.02650astro-ph.HE
收藏

来自核心坍缩超新星中加速粒子的随时间变化的高能gamma-ray信号:SN 1993 J

Time-dependent high-energy gamma-ray signal from accelerated particles in core-collapse supernovae: the case of SN 1993J

Pierre Cristofari, Matthieu Renaud, Alexandre Marcowith, Vikram V. Dwarkadas, Vincent Tatischeff

摘要:

一些核心坍缩超新星可能是有效的宇宙射线加速器,达到PeV范围,因此,在整个银河系宇宙射线种群中可能发挥重要作用。TeV伽马射线域可以用来研究多TeV和PeV范围内的粒子加速。这促使人们研究目前和未来伽马射线设施对这类超新星的探测能力。核心坍缩超新星的伽马射线辐射强烈地依赖于双光子湮灭过程的水平:超新星爆炸后的膨胀冲击波中发射的高能伽马射线光子可以通过对产生通道与来自超新星光球的软光子相互作用,从而强烈抑制离开系统的伽马射线通量。在SN 1993 J的情况下,其光球和冲击相关的参数测量良好,我们计算的时间演变的预期伽马射线衰减占时间和几何效应。我们发现,在SN爆炸后的头几天,衰减约为$10$数量级。如果在超新星爆发后1天或10天内进行观测,当伽马射线衰减降低到大约$2$数量级时,切伦科夫望远镜阵列探测到类似SN 1993 J的超新星的概率最高。

英文摘要:

Some core-collapse supernovae are likely to be efficient cosmic-ray accelerators up to the PeV range, and therefore, to potentially play an important role in the overall Galactic cosmic-ray population. The TeV gamma-ray domain can be used to study particle acceleration in the multi-TeV and PeV range. This motivates the study of the detectability of such supernovae by current and future gamma-ray facilities. The gamma-ray emission of core-collapse supernovae strongly depends on the level of the two-photon annihilation process: high-energy gamma-ray photons emitted at the expanding shock wave following the supernova explosion can interact with soft photons from the supernova photosphere through the pair production channel, thereby strongly suppressing the flux of gamma rays leaving the system. In the case of SN 1993J, whose photospheric and shock-related parameters are well measured, we calculate the temporal evolution of the expected gamma-ray attenuation by accounting for the temporal and geometrical effects. We find the attenuation to be of about $10$ orders of magnitude in the first few days after the SN explosion. The probability of detection of a supernova similar to SN 1993J with the Cherenkov Telescope Array is highest if observations are performed either earlier than 1 day, or later than 10 days after the explosion, when the gamma-ray attenuation decreases to about $2$ orders of magnitude.

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。

↑