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 1407.7657astro-ph.HEastro-ph.GA
收藏

在RE J1034 +396的5 XMM-牛顿观测中探测QPO

Detection of a QPO in 5 XMM-Newton observations of RE J1034+396

W. N. Alston, J. Markevičiūtė, E. Kara, A. C. Fabian, M. Middleton

摘要:

RE J1034+396中的X射线准周期振荡(QPO)在$\sim 2.6 \times 10^{-4}$ Hz处,在一次$\sim 90$ ksXMM-Newton观测的0.2-10 keV波段被稳健地观测到,但在随后的观测中没有被探测到。在这里,我们调查的功率谱密度(PSD)的8个档案XMM牛顿观测RE J1034+396,并寻找存在的QPO在三个能带:软(0.3-0.8 keV),硬(1.0-4.0 keV)和总(0.2-10.0 keV)。我们发现一个显着的检测QPO功能的硬带PSD的5低通量/光谱硬观测。在$\sim 4$多年的观测中,QPO频率一直保持在$\sim 2.6 \times 10^{-4}$ Hz,尽管除了在最初的观测中,它不再在软频带中被检测到。这一结果增加了QPO存在的持续时间(现在是$\sim 250$ ks),从而可以更好地理解在活动星系核(AGN)和黑洞X射线双星(BHB)中观察到的QPO现象。

英文摘要:

The X-ray quasi-periodic oscillation (QPO) at $\sim 2.6 \times 10^{-4}$ Hz in RE J1034+396 has been robustly observed in the 0.2-10 keV band of one $\sim 90$ ks XMM-Newton observation, but was not detected in subsequent observations. Here, we investigate the power spectral density (PSD) of 8 archival XMM-Newton observations of RE J1034+396, and search for the presence of QPOs in three energy bands: soft (0.3-0.8 keV); hard (1.0-4.0 keV) and total (0.2-10.0 keV). We find a significant detection of a QPO feature in the hard-band PSD of 5 low flux/spectrally-harder observations. The QPO frequency has remained persistent at $\sim 2.6 \times 10^{-4}$ Hz over $\sim 4$ years of observations, though it is no longer detected in the soft band, except in the original observation. This result increases the duration where the QPO is present by a factor of three (now $\sim 250$ ks), allowing for a better understanding of the QPO phenomenon observed in both Active Galactic Nuclei (AGN) and black hole X-ray binaries (BHBs).

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。

↑