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arXiv 2108.09714astro-ph.GA
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具有双峰宽Hβ和单峰宽Hα的SDSS J154751 .94+025550:中心双星黑洞系统的候选者?

SDSS J154751.94+025550 with double-peaked broad Hβbut single-peaked broad Hα: a candidate for central binary black hole system?

XueGuang Zhang

摘要:

本文报道了一个有趣的蓝色活动星系核(AGN)SDSS J154751.94+025550(=SDSS J1547),它具有非常不同的宽巴耳末发射线轮廓:双峰宽H $β$和单峰宽H $α$。SDSS J1547是第一个详细讨论了宽巴尔末发射线的非常不同的线轮廓的活动星系核,除了SDSS J 0159 +0105中简单提到的候选双黑洞(BBH)系统中的不同宽线。在SDSS J1547中的中心BBH系统中,两个中心BLR的不同物理条件可以很好地解释宽巴耳末发射线的非常不同的线轮廓。此外,从CSS的长期光变曲线可以很好地描述了一个正弦函数的周期约为2159天,提供了进一步的证据,支持预期的中央BBH系统在SDSS J1547。因此,将宽巴耳末发射线的不同谱线轮廓作为宽线活动星系核中心BBH系统的内在指示是很有意义的。在BBH系统的假设下,可以预期0.125%的宽线活动星系核具有非常不同的宽巴耳末发射线轮廓。未来的研究更宽的线AGN与非常不同的线轮廓的宽巴耳末发射线的宽巴耳末发射线作为BBH系统的指示提供了进一步的线索。

英文摘要:

In this manuscript, an interesting blue Active Galactic Nuclei (AGN) SDSS J154751.94+025550 (=SDSS J1547) is reported with very different line profiles of broad Balmer emission lines: double-peaked broad H$β$ but single-peaked broad H$α$. SDSS J1547 is the first AGN with detailed discussions on very different line profiles of the broad Balmer emission lines, besides the simply mentioned different broad lines in the candidate for a binary black hole (BBH) system in SDSS J0159+0105. The very different line profiles of the broad Balmer emission lines can be well explained by different physical conditions to two central BLRs in a central BBH system in SDSS J1547. Furthermore, the long-term light curve from CSS can be well described by a sinusoidal function with a periodicity about 2159days, providing further evidence to support the expected central BBH system in SDSS J1547. Therefore, it is interesting to treat different line profiles of broad Balmer emission lines as intrinsic indicators of central BBH systems in broad line AGN. Under assumptions of BBH systems, 0.125\% of broad line AGN can be expected to have very different line profiles of broad Balmer emission lines. Future study on more broad line AGN with very different line profiles of broad Balmer emission lines could provide further clues on the different line profiles of broad Balmer emission lines as indicator of BBH systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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