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arXiv 0912.3479astro-ph.HEastro-ph.CO
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射电宁静活动星系核中的Cosmic Ray粒子:NGC 4051的个例研究

Cosmic Ray Spallation in Radio-Quiet Active Galactic Nuclei: A Case Study of NGC 4051

T. J. Turner, L. Miller

摘要:

我们调查的条件和后果spiritual在无线电安静的塞弗特星系。这项工作的动机是最近发现的显着线发射在5.44 keV的朱雀数据从NGC 4051。新谱线的能量表明它是Cr I Ka发射,然而这条谱线比从具有宇宙丰度的物质中预期的要强得多,这导致了由于来自活性核的低能宇宙射线导致Fe的核散射而增强的建议。我们发现,最高的丰度增强很可能发生在气体的平面外的吸积盘和时间尺度的spiritual可能是短短的几年。在射电宁静的塞弗特星系中存在强烈的宇宙射线核通量的建议特别令人感兴趣,因为最近皮埃尔俄歇天文台的数据表明,超高能宇宙射线可能起源于这种来源。

英文摘要:

We investigate conditions for and consequences of spallation in radio-quiet Seyfert galaxies. The work is motivated by the recent discovery of significant line emission at 5.44 keV in Suzaku data from NGC 4051. The energy of the new line suggests an identification as Cr I Ka emission, however the line is much stronger than would be expected from material with cosmic abundances, leading to a suggestion of enhancement owing to nuclear spallation of Fe by low energy cosmic rays from the active nucleus. We find that the highest abundance enhancements are likely to take place in gas out of the plane of the accretion disk and that timescales for spallation could be as short as a few years. The suggestion of a strong nuclear flux of cosmic rays in a radio-quiet Seyfert galaxy is of particular interest in light of the recent suggestion from Pierre Auger Observatory data that ultra-high-energy cosmic rays may originate in such sources.

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