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arXiv 1702.06807astro-ph.HE
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XMM-牛顿回转测量中的AGN特征

Characterisation of AGN from the XMM-Newton Slew Survey

R. L. C. Starling, C. Wildy, K. Wiersema, S. Mateos, R. D. Saxton, A. M. Read, B. Mingo

摘要:

我们目前的光谱学的候选活动星系核精确定位的斯威夫特后续活动在XMM-牛顿回转调查中的不明瞬态,增加的完整性的活动星系核的鉴定调查。我们的Swift后续活动确定了17个XRT检测到的候选AGN,其中9个被选中进行光学跟踪,另外两个在其他地方被确认为AGN。利用在威廉赫歇尔望远镜,甚大望远镜和新技术望远镜获得的数据,我们发现活动星系核的功能,在七个候选人。我们将六个分类为Seyfert类型1.0至1.5,宽线区域速度跨越2000- 12000 km s $^{-1}$,并确定一个可能的II型活动星系核,与缺乏软带X射线探测的回转调查。该样本的维里黑洞质量估计值介于1 $\times$ 10 $^{8}$ M $_{\odot}$和3 $\times$ 10 $^9$ M $_{\odot}$之间,其中一个源可能发射接近其爱丁顿速率,$L_{\rm Bol}/L_{\rm Edd} \sim 0.9$。我们发现一个广泛的红移范围的$0.08<z<0.9$的9个现已确认的活动星系核从不明的回转巡天样本。一个未分类的来源显示了活动星系核中罕见的爆发。我们的结论是,以这种方式发现的活动星系核是一致的,在很大程度上不变,回转选择,已知的活动星系核人口。我们还发现与XMM-牛顿明亮的偶然调查AGN选择从指向的观测平行,并假设浅X射线调查选择AGN从相同的人口已在较深的X射线选择的样品的特点。

英文摘要:

We present optical spectroscopy of candidate AGN pinpointed by a Swift follow-up campaign on unidentified transients in the XMM-Newton Slew Survey, increasing the completeness of the identifications of AGN in the Survey. Our Swift follow-up campaign identified 17 XRT-detected candidate AGN, of which nine were selected for optical follow-up and a further two were confirmed as AGN elsewhere. Using data obtained at the William Herschel Telescope, Very Large Telescope and New Technology Telescope, we find AGN features in seven of the candidates. We classify six as Seyfert types 1.0 to 1.5, with broad-line region velocities spanning 2000--12000 km s$^{-1}$, and identify one as a possible Type II AGN, consistent with the lack of a soft band X-ray detection in the Slew Survey. The Virial black hole mass estimates for the sample lie between 1$\times$10$^{8}$ M$_{\odot}$ and 3$\times$10$^9$ M$_{\odot}$, with one source likely emitting close to its Eddington rate, $L_{\rm Bol}/L_{\rm Edd} \sim 0.9$. We find a wide redshift range of $0.08<z<0.9$ for the nine now confirmed AGN drawn from the unidentified Slew Survey sample. One source remaining unclassified shows outbursts rarely seen before in AGN. We conclude that AGN discovered in this way are consistent with the largely non-varying, Slew-selected, known AGN population. We also find parallels with XMM-Newton Bright Serendipitous Survey AGN selected from pointed observations, and postulate that shallow X-ray surveys select AGN drawn from the same populations that have been characterised in deeper X-ray selected samples.

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