arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.02890astro-ph.HE
收藏

Gamma-Ray -发射射电星系NGC 1275的朱雀X射线监测

Suzaku X-Ray Monitoring of Gamma-Ray-Emitting Radio Galaxy, NGC 1275

Ikumi Edahiro, Yasushi Fukazawa, Kenji Kawaguchi, Yasuyuki Tanaka, Ryosuke Itoh, Yuka Kanda, Kensei Shiki

摘要:

NGC 1275是一个位于英仙座星系团中心的伽马射线射电星系。它的多波长光谱与开拓者相似,因此伽马射线的发射被认为是喷流起源。在光学和X射线区域,NGC 1275也显示出明亮的核心,但它们的来源还不清楚,因为不排除盘状辐射。事实上,NGC 1275具有光学宽发射线和X射线Fe-K线,这是塞弗特星系的典型特征。在我们用朱雀/XIS对NGC 1275进行的宝贵研究中,从2006年到2011年,没有发现X射线时间变异性,尽管{it Fermi}-LAT~ \cite{Yamazaki}观察到中等的伽马射线变异性。我们继续用朱雀/XIS监测NGC 1275的观测。在2013-2014年,NGC 1275的MeV/GeV伽马射线通量逐渐增加,并在2014年初达到最大值。与最近的伽马射线活动相关,我们发现X射线通量也增加了,这是NGC 1275 X射线可变性的第一个证据。根据这些结果,我们讨论了时间变化中的发射分量,但我们不能确定与γ射线相关的X射线变化的起源。因此,在未来的观测中,利用费米伽马射线、XMM-牛顿、NuStar、ASTRO-H X射线、CTA TeV伽马射线和Kanata光学望远镜观测NGC 1275具有重要意义。

英文摘要:

NGC 1275 is a gamma-ray-emitting radio galaxy at the center of the Perseus cluster. Its multi-wavelength spectrum is similar to that of blazers, and thus a jet-origin of gamma-ray emissions is believed. In the optical and X-ray region, NGC 1275 also shows a bright core, but their origin has not been understood, since a disk emission is not ruled out. In fact, NGC 1275 exhibits optical broad emission lines and a X-ray Fe-K line, which are typical for Seyfert galaxies. In our precious studies of NGC 1275 with Suzaku/XIS, no X-ray time variability was found from 2006 to 2011, regardless of moderate gamma-ray variability observed by {it Fermi}-LAT~\cite{Yamazaki}. We have continued monitoring observations of NGC 1275 with Suzaku/XIS. In 2013-2014, MeV/GeV gams-ray flux of NGC 1275 gradually increased and reached the maximum at the beginning of 2014. Correlated with this recent gamma-ray activity, we found that X-ray flux also increased, and this is the first evidence of X-ray variability of NGC 1275. Following these results, we discuss the emission component during the time variability, but we cannot decide the origin of X-ray variability correlating with gamma-ray. Therefore, for future observation, it is important to observe NGC 1275 by using Fermi gamma-ray, XMM-Newton, NuStar, ASTRO-H X-ray, CTA TeV gamma-ray and Kanata optical telescope.

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。

↑