Are the broad optical Balmer lines in PG 1613+658 from the central accretion disc?
Are the broad optical Balmer lines in PG 1613+658 from the central accretion disc?
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DOI：
10.1093/mnrasl/slu172
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发表时间：
2015-02
影响因子：
--
通讯作者：
XueGuang Zhang
中科院分区：
文献类型：
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作者：
XueGuang Zhang
在这封信中，我们报告了活动星系核（AGN）PG 1613+658的宽巴尔默线的宽线宽度和宽线通量之间的正相关性，这已经被观察到很长时间了。正相关性表明 PG 1613+658 的 BLR 结构与通常认为的由辐射压和气压之间的平衡主导的 BLR 结构非常不同，而不是广泛接受的 AGN 宽发射线区 (BLR) 维里化假设所带来的预期负相关性。因此，最好假设所观察到的PG 1613+658的宽单峰光学巴尔默线源自吸积盘，因为主要受重力支配的具有径向结构的盘状BLR几乎不受辐射压力的影响。
In this letter, we report on the positive correlations between the broad-line width and broadline flux for the broad Balmer lines of the active galactic nucleus (AGN) PG 1613+658, which has been observed for a long time. Rather than the expected negative correlations that come with the widely accepted virialization assumption for AGN broad emission-line regions (BLRs), the positive correlations indicate very different BLR structures of PG 1613+658 from the commonly considered BLR structures that are dominated by the equilibrium between radiation pressure and gas pressure. Therefore, it is preferable to assume that the observed broad single-peaked optical Balmer lines of PG 1613+658 originate from the accretion disc, because the mainly gravity-dominated disc-like BLRs with radial structures have few effects from radiation pressure.