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arXiv 1602.01683astro-ph.HE
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磁场对Virgo A发射的UHECR的影响

The Influence of Magnetic Fields on UHECR Propagation from Virgo A

Oleh Kobzar, Olexandr Sushchov, Bohdan Hnatyk, Volodymyr Marchenko

摘要:

活动星系核(AGN)被认为是能量超过$\sim 10^{18}$ eV的宇宙射线最合适的来源之一。室女座A(M87或NGC 4486)是第二接近银河系的活跃星系。根据现有的估计,它可能是超高能宇宙射线(UHECR)的主要来源。然而,在室女座A附近的天空区域并没有记录很多事件,可能是由于磁场的影响。在目前的工作中,我们检查UHECR事件从最近的数据集(AUGER,望远镜阵列等)。它们起源于活动星系核的可能性我们进行了模拟的UHECR运动从室女座A考虑到他们的偏转在银河系(GMF)以及河外(EGMF)磁场根据几个最新的模型。因此,获得了预期UHECR到达方向的地图。结果表明:1)EGMF引起的UHECR偏转与GMF相当,且EGMF的影响有时占主导地位; 2)EGMF的影响在UHECR期望到达方向的最终分布上表现出明显的不对称性; 3)模拟结果依赖于所选的GMF模型,有待进一步讨论。

英文摘要:

Active galactic nuclei (AGN) are considered as one of the most appropriate sources of cosmic rays with energy exceeding $\sim 10^{18}$ eV. Virgo A (M87 or NGC 4486) is the second closest to the Milky Way active galaxy. According to existing estimations it can be a prominent source of ultra high energy cosmic rays (UHECR). However not many events have been registered in the sky region near Virgo A, possibly due to magnetic field influence. In the present work we check UHECR events from the recent sets of data (AUGER, Telescope Array etc.) for possibility of their origination in this AGN. We carried out the simulation of UHECR motion from Virgo A taking into account their deflections in galactic (GMF) as well as extragalactic (EGMF) magnetic fields according to the several latest models. The maps of expected UHECR arrival directions were obtained as a result. It has been found the following: 1) UHECR deflection caused by EGMF is comparable with GMF one, moreover the influence of EGMF sometimes is dominating; 2) effect of EGMF demonstrates obvious asymmetry in the final distribution of expected UHECR arrival directions; 3) the results of simulations depend on chosen GMF model and are still open for the discussion.

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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