A note on periodicity of long-term variations of optical continuum in active galactic nuclei

A note on periodicity of long-term variations of optical continuum in active galactic nuclei
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关于活动星系核中光学连续谱长期变化周期性的注记

DOI:
10.1093/mnrasl/slw062
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发表时间:
2016-04
影响因子:
4.8
通讯作者:
Wang Jian-Ming
Wang Jian-Ming
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lu Kai-Xing;Li Yan-Rong;Bi Shao-Lan;Wang Jian-Ming

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Graham等人。从Catalina实时瞬变探测(CRTS)中发现了一组活动星系核(AGN)和类星体,它们在光学连续体中具有长期的周期性变化,这种周期性的性质仍然不确定。我们通过测试观测到的变化周期与活动星系核的光学光度、黑洞质量和吸积率的关系来研究样品的周期变化特征,没有发现显著的相关性。我们还从几个与单黑洞吸积盘有关的不同方面对观测周期进行了检验,如5100~\aA光子发射区和自重主导区的开普勒式自转周期以及翘曲盘的进动周期。这些测试为从总体上理解AGN的可变性提供了新的线索。在假设周期行为与SMBHB系统相关的假设下,我们将分离度($\mathscr{D}_{\Bullet}$)与双星的宽线区域的特征半径($R_{\Rm BLR}$)进行比较,得到$\mathscr{D}_{\Bullet}$\约$0.05$R_{\Rm BLR}$。有趣的是,这意味着这些二进制只有外接二进制BLR。
Graham et al. found a sample of active galactic nuclei (AGNs) and quasars from the Catalina Real-time Transient Survey (CRTS) that have long-term periodic variations in optical continuum, the nature of the periodicity remains uncertain. We investigate the periodic variability characteristics of the sample by testing the relations of the observed variability periods with AGN optical luminosity, black hole mass and accretion rates, and find no significant correlations. We also test the observed periods in several different aspects related to accretion disks surrounding single black holes, such as the Keplerian rotational periods of 5100~\AA\ photon-emission regions and self-gravity dominated regions and the precessing period of warped disks. These tests shed new lights on understanding AGN variability in general. Under the assumption that the periodic behavior is associated with SMBHB systems in particular, we compare the separations ($\mathscr{D}_{\bullet}$) against characteristic radii of broad-line regions ($R_{\rm BLR}$) of the binaries and find $\mathscr{D}_{\bullet}$$\approx$ 0.05 $R_{\rm BLR}$. This interestingly implies that these binaries have only circumbinary BLRs.
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DOI: 10.1051/0004-6361:20010791
发表时间: 2001-08-01
影响因子: 6.5
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