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.
Significant X-ray Line Emission in the 5-6 keV band of NGC 4051
朱雀X射线观测NGC 4051在2005年11月期间采取揭示线发射在5.44千电子伏的休息框架的星系,没有一个明显的起源在已知的休息框架原子跃迁。当考虑这条线时,拟合统计量的改进建立了其真实性,置信度>99.9%:我们还验证了在三个XIS单元中独立检测到这条线。数据与蒙特卡罗模拟的比较表明,谱线是统计涨落的概率为p < 3.3 x 10^-4。考虑到朱雀星不同时期的数据中有三个独立的谱线检测,得出概率p< 3 x 10^-11,从而最终证明它不可能是数据中的统计波动。在2005年期间,当源通量较低时,来自中性物质的Fe Ka发射的新谱线和强分量是突出的。2008年的光谱显示了一条与2005年观测到的通量和能量一致的谱线,但与观测到的连续谱的恒定等效宽度不一致。线通量和能量的稳定性表明,它可能不会出现在瞬变热点,因为已经建议在其他来源的类似线,但可能会出现在一个特殊的位置,如吸积盘的内边缘的再处理器。或者,线能量可以解释为铁到铬的spectration,在配套文件中讨论。
VERITAS Observations Contemporaneous with the LHAASO Detection of NGC 4278
DePauw University(迪堡大学);Temple University(天普大学);University of Utah(犹他大学);Washington University, St. Louis(华盛顿大学圣路易斯分校);University of California, Los Angeles(加州大学洛杉矶分校);California Polytechnic State University(加州州立理工大学)
Investigation on the X-ray emission of NGC 4051 during its 2009 optical/UV-X-ray dissociation phase
Jiangxi Province Key Laboratory of Applied Optical Technology, School of Physical Science and Intelligent Education, Shangrao Normal College(上饶师范学院物理科学与智能教育学院);School of Digital Technology Application Industry, Shangrao Normal College(上饶师范学院数字技术应用产业学院)
TeV Gamma Rays and Neutrinos from Winds Driven by Radiatively Inefficient Accretion Flows of Low-Luminosity Active Galactic Nuclei
The University of Osaka(大阪大学);The Ohio State University(俄亥俄州立大学);The Pennsylvania State University(宾夕法尼亚州立大学);Yukawa Institute for Theoretical Physics, Kyoto University(京都大学汤川理论物理研究所)
本研究针对LHAASO探测到的LLAGN NGC 4278宁静期TeV伽马射线,提出RIAF驱动风的新机制,建模重现其辐射,还可推广至Sgr A*,为LLAGN辐射机制提供新解释。