Testing the relativistic Doppler boost hypothesis for supermassive binary black holes candidates via broad emission line profiles
Testing the relativistic Doppler boost hypothesis for supermassive binary black holes candidates via broad emission line profiles
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通过宽发射线剖面测试超大质量双黑洞候选者的相对论多普勒增强假设
DOI：
10.1093/mnras/stz3354
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发表时间：
2019-12
影响因子：
4.8
通讯作者：
Xiang Ji
中科院分区：
文献类型：
--
作者：
Zihao Song;Junqiang Ge;Youjun Lu;Xiang Ji
通过瞬态观测发现的光学周期性类星体被认为是亚秒差距超大质量双星黑洞。对其中一些类星体的周期性的一个有趣的解释是，连续谱是从与BBH次级分量相关的吸积盘辐射的，并通过多普勒增强效应被次级分量的周期性旋转调制。接近边缘的轨道取向可以导致更显著的多普勒增强效应，因此对于这些系统是优选的，这不同于那些或多或少面对面取向的正常1型类星体。因此，从这些多普勒调制系统发射的宽线的轮廓可能与未被多普勒调制的其他系统显著不同。我们调查的光学周期性类星体，包括一个样本的类星体，可以解释的多普勒调制效应和样本，不能广泛的发射线的属性。我们发现，这两个样品的各种（堆叠）宽发射线的轮廓和其他性质没有明显的差异，尽管一个简单的宽线区域模型会表明显着的差异。我们的发现提出了一个挑战，多普勒提升假设的一些BBH候选人与光学周期性。
Optical periodicity QSOs found by transient surveys are suggested to be subparsec supermassive binary black holes (BBHs). An intriguing interpretation for the periodicity of some of those QSOs is that the continuum is radiated from the accretion disc associated with the BBH secondary component and modulated by the periodical rotation of the secondary via Doppler-boost effect. Close to edge-on orbital orientation can lead to more significant Doppler-boost effect and thus are preferred for these systems, which is distinct from those normal type-1 QSOs with more or less face-on orientations. Therefore, the profiles of broad lines emitted from these Doppler-modulated systems may be significantly different from other systems that are not Doppler modulated. We investigate the properties of the broad emission lines of optical-periodicity QSOs, including both a sample of QSOs that can be interpreted by the Doppler-modulated effects and a sample that cannot. We find that there is no obvious difference in the profiles and other properties of various (stacked) broad emission lines of these two samples, though a simple broad line region model would suggest significant differences. Our finding raises a challenge to the Doppler boost hypothesis for some of those BBHs candidates with optical periodicity.
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DOI：
10.3847/0004-637x/827/1/56
发表时间：
2015-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Zhen-ya Zheng;N. Butler;Yue Shen;Linhua Jiang;Junxian Wang;Xian Chen;J. Cuadra
通讯作者：
Zhen-ya Zheng;N. Butler;Yue Shen;Linhua Jiang;Junxian Wang;Xian Chen;J. Cuadra
DOI：
10.3847/1538-4357/ab40cb
发表时间：
2017-10
期刊：
The Astrophysical Journal
影响因子：
--
作者：
T. Liu;S. Gezari;M. Ayers;W. Burgett;K. Chambers;K. Hodapp;M. Huber;R. Kudritzki;N. Metcalfe;J. Tonry;R. Wainscoat;C. Waters
通讯作者：
T. Liu;S. Gezari;M. Ayers;W. Burgett;K. Chambers;K. Hodapp;M. Huber;R. Kudritzki;N. Metcalfe;J. Tonry;R. Wainscoat;C. Waters
影响因子：
3.5
作者：
B. Peterson
通讯作者：
B. Peterson
DOI：
10.1086/345498
发表时间：
2002-06
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
T. Sigut;Anil K. Pradhan
通讯作者：
T. Sigut;Anil K. Pradhan
影响因子：
33.3
作者：
R. Antonucci
通讯作者：
R. Antonucci