An accretion disc-irradiation hybrid model for the optical/UV variability in radio-quiet quasars
An accretion disc-irradiation hybrid model for the optical/UV variability in radio-quiet quasars
复制标题
无线电静类星体中光学/紫外变化的吸积盘-辐照混合模型
DOI：
10.1093/mnrasl/slw123
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Hengxiao Guo
中科院分区：
文献类型：
--
作者：
Hui Liu;Shuang-Liang Li;Minfeng Gu;Hengxiao Guo
类星体的光学/紫外光变与类星体的其他性质，如光度、黑洞质量和静止坐标波长等都有密切的关系。然而，变异性的起源至今仍是一个谜。在这项工作中，我们升级的吸积盘模型（Li & Cao 2008），其中假设的变化是由全球质量吸积率的变化，通过限制盘的大小，以匹配的粘性时间尺度的吸积盘观测到的变化时间尺度，并通过包括照射/X射线后处理，使发射光谱变得陡峭。我们发现这个混合模型可以很好地再现观测到的蓝时亮的趋势，这是用来验证理论模型的一些工作最近。传统的变异幅度与静止帧波长的相关关系也可以用我们的模型很好地拟合。此外，一个弱的正相关性之间的变化幅度和黑洞的质量是目前，定性与最近的观测。
The optical/ultraviolet (UV) variability of quasars has been discovered to be correlated with other quasar properties, such as luminosity, black hole mass and rest-frame wavelength. However,the origin of variability has been a puzzle so far. In this work, we upgrade the accretion disc model (Li & Cao 2008), which assumed the variability is caused by the change of global mass accretion rate, by constraining the disc size to match the viscous timescale of accretion disc to the variability timescale observed and by including the irradiation/X-ray reprocessing to make the emitted spectrum become steeper. We find this hybrid model can reproduce the observed bluer-when-brighter trend quite well, which is used to validate the theoretical model by several works recently. The traditional correlation between the variability amplitude and rest-frame wavelength can also be well fitted by our model. In addition, a weak positive correlation between variability amplitude and black hole mass is present, qualitatively consistent with recent observations.
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DOI：
10.1088/0004-637x/783/1/46
发表时间：
2014-01
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Kokubo;T. Morokuma;T. Minezaki;M. Doi;T. Kawaguchi;H. Sameshima;Shin Mineshige Department of Astronomy;School of Materials Science;T. U. O. Tokyo;K. I. F. T. Physics;M. Universe;Todai Institutes for Advanced Study;Research Center for the Early Universe;D. Physics;Information Science;Y. University;I. O. Space;Astronautical Science;Japan Aerospace Exploration Agency;Center of Astro Engineering;Department of Electrical Engineering;P. U. C. D. Chile
通讯作者：
M. Kokubo;T. Morokuma;T. Minezaki;M. Doi;T. Kawaguchi;H. Sameshima;Shin Mineshige Department of Astronomy;School of Materials Science;T. U. O. Tokyo;K. I. F. T. Physics;M. Universe;Todai Institutes for Advanced Study;Research Center for the Early Universe;D. Physics;Information Science;Y. University;I. O. Space;Astronautical Science;Japan Aerospace Exploration Agency;Center of Astro Engineering;Department of Electrical Engineering;P. U. C. D. Chile
DOI：
10.1088/0004-637x/792/1/33
发表时间：
2014-07
期刊：
The Astrophysical Journal
影响因子：
--
作者：
H. Guo 郭;M. Gu
通讯作者：
H. Guo 郭;M. Gu
影响因子：
4.8
作者：
R. C. Fernandes;I. Aretxaga;R. T. D. D. F. -. Ufsc-R.-T.-D.-D.-F.-.-Ufsc-102575285;Florianópolis;Brazil Royal Greenwich Observatory;
通讯作者：
R. C. Fernandes;I. Aretxaga;R. T. D. D. F. -. Ufsc-R.-T.-D.-D.-F.-.-Ufsc-102575285;Florianópolis;Brazil Royal Greenwich Observatory;
DOI：
10.1046/j.1365-8711.2002.04939.x
发表时间：
2001-10
影响因子：
4.8
作者：
M. Hawkins
通讯作者：
M. Hawkins
DOI：
10.1088/0004-637x/744/2/147
发表时间：
2011-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
K. Schmidt;H. Rix;J. Shields;M. Knecht;D. Hogg;D. Maoz;J. Bovy
通讯作者：
K. Schmidt;H. Rix;J. Shields;M. Knecht;D. Hogg;D. Maoz;J. Bovy