arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2202.00895astro-ph.HE
收藏

Swift/BAT选择Seyfert 1活动星系核的X射线日冕性质

X-ray Coronal Properties of Swift/BAT-Selected Seyfert 1 Active Galactic Nuclei

Nikita Kamraj, Murray Brightman, Fiona A. Harrison, Daniel Stern, Javier A. García, Mislav Baloković, Claudio Ricci, Michael J. Koss, Julian E. Mejía-Restrepo, … 展开作者

Nikita Kamraj, Murray Brightman, Fiona A. Harrison, Daniel Stern, Javier A. García, Mislav Baloković, Claudio Ricci, Michael J. Koss, Julian E. Mejía-Restrepo, Kyuseok Oh, Meredith C. Powell, C. Megan Urry

摘要:

日冕是活动星系核(AGN)的一个组成部分,它产生了1- 2 keV以上的大部分X射线辐射。然而,它的许多物理特性和驱动这种发射的机制仍然是一个谜。特别是,日冕等离子体的温度一直难以约束AGN的大样本,因为约束需要高质量的宽带X射线光谱覆盖范围超过10千电子伏,以测量高能量的截止,这提供了对日冕光学深度和温度的组合的约束。我们提出了一个大样本的Seyfert 1 AGN的日冕温度的限制,从雨燕/BAT调查使用高质量的硬X射线数据从NuSTAR天文台结合软X射线数据雨燕/XRT或XMM-牛顿。当应用一个物理动机,非相对论磁盘反射模型的X射线光谱,我们发现一个平均日冕温度kT $=$ 84 $\pm$ 9千电子伏。我们发现日冕截止能量和诸如爱丁顿比和黑洞质量等吸积参数之间没有显著的相关性。我们也没有发现X射线光子指数、$Γ$和爱丁顿比之间的统计学显著相关性。这就对使用这种关系来推断超大质量黑洞系统的性质提出了质疑。

英文摘要:

The corona is an integral component of Active Galactic Nuclei (AGN) which produces the bulk of the X-ray emission above 1--2 keV. However, many of its physical properties and the mechanisms powering this emission remain a mystery. In particular, the temperature of the coronal plasma has been difficult to constrain for large samples of AGN, as constraints require high quality broadband X-ray spectral coverage extending above 10 keV in order to measure the high energy cutoff, which provides constraints on the combination of coronal optical depth and temperature. We present constraints on the coronal temperature for a large sample of Seyfert 1 AGN selected from the Swift/BAT survey using high quality hard X-ray data from the NuSTAR observatory combined with simultaneous soft X-ray data from Swift/XRT or XMM-Newton. When applying a physically-motivated, non-relativistic disk reflection model to the X-ray spectra, we find a mean coronal temperature kT $=$ 84$\pm$9 keV. We find no significant correlation between the coronal cutoff energy and accretion parameters such as the Eddington ratio and black hole mass. We also do not find a statistically significant correlation between the X-ray photon index, $Γ$, and Eddington ratio. This calls into question the use of such relations to infer properties of supermassive black hole systems.

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。

↑