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arXiv 1905.07571astro-ph.HE
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通过SNR周围分子云的γ射线和中微子探测SNR中宇宙射线的最大能量

Probing maximum energy of cosmic rays in SNR through gamma rays and neutrinos from the molecular clouds around SNR W28

Prabir Banik, Arunava Bhadra

摘要:

银河系宇宙射线一般认为起源于超新星遗迹(SNRs),是由超新星遗迹膨胀驱动的超新星爆炸波中的扩散激波加速(DSA)过程产生的。宇宙线模型信噪比起源的一个关键问题是超新星激波中宇宙线粒子可获得的最大能量。最近有人提出,由于加速的宇宙射线引起的磁波的增长,在年轻的SNR中可能会发生激波处的有效磁场强度的放大,因此,SNR中宇宙射线所获得的最大能量可能达到膝能,而不是先前在正常磁场情况下预测的$\sim 200$ TeV。在目前的工作中,我们调查的影响TeV的伽马射线和中微子通量的分子云与SNR W28相互作用的最大能量的情况。作者计算伽马射线和中微子通量假设两个不同的值的最大能量达到宇宙射线在SNR,从CR在附近的分子云的相互作用。质子和原子核都被认为是加速粒子和靶物质。我们的研究结果表明,宇宙射线在信噪比的最大能量的问题,可以通过即将到来的伽马射线实验,大型高海拔空气簇射天文台(LHAASO)的观测解决。然而,从分子云中估计的中微子通量是目前/不久的将来一代中微子望远镜所无法达到的。

英文摘要:

The galactic cosmic rays are generally believed to be originated in supernova remnants (SNRs), produced in diffusive shock acceleration (DSA) process in supernova blast waves driven by expanding SNRs. One of the key unsettled issue in SNR origin of cosmic ray model is the maximum attainable energy by a cosmic ray particle in the supernova shock. Recently it has been suggested that an amplification of effective magnetic field strength at the shock may take place in young SNRs due to growth of magnetic waves induced by accelerated cosmic rays and as a result the maximum energy achieved by cosmic rays in SNR may reach the knee energy instead of $\sim 200$ TeV as predicted earlier under normal magnetic field situation. In the present work we investigate the implication of such maximum energy scenarios on TeV gamma rays and neutrino fluxes from the molecular clouds interacting with the SNR W28. The authors compute the gamma-ray and neutrino flux assuming two different values for the maximum energy reached by cosmic rays in the SNR, from CR interaction in nearby molecular clouds. Both protons and nuclei are considered as accelerated particles and as target material. Our findings suggest that the issue of the maximum energy of cosmic rays in SNRs can be observationally settled by the upcoming gamma-ray experiment the Large High Altitude Air Shower Observatory (LHAASO). The estimated neutrino fluxes from the molecular clouds are , however, out of reach of the present/near future generation of neutrino telescopes.

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