论文标题
确认的Subparsec超质量二进制黑洞候选MRK 231的短期周期性变化
Confirmed short periodic variability of subparsec supermassive binary black hole candidate Mrk 231
论文作者
论文摘要
在这里，我们在Catalina实时瞬态调查（CRTS）收集的扩展光学光度数据集（ASAS-SN）收集的扩展光学光度数据集和All-Sky自动调查（ASAS-SN）收集的扩展光学光度数据集中，确认了Subparsec超级质量二进制黑洞（SMBBH）候选MRK 231的短期周期性变化。使用Lomb-Scargle期刊和2Dhybrid方法，我们在CRTS+ASAS-SN光学数据集中检测到了〜1.1年的显着周期性。先前已提出MRK 231为具有高度不等质量比（Q 〜0.03）的SMBBH候选者，非常紧密的相互分离〜590 AU，轨道周期为〜1.2年。因此，我们的结果进一步支持，即使没有证明，质量比较低的SMBBHS可能比近距均等质量SMBBHS更为普遍的有趣假设。然而，从具有有限的采样节奏和光度准确性的CRTS数据的贡献中获得了这一结果，对MRK 231的进一步监测对于确认周期性至关重要。
Here we confirm the short periodic variability of a subparsec supermassive binary black hole (SMBBH) candidate Mrk 231 in the extended optical photometric data set collected by the Catalina Real-Time Transient Survey (CRTS) and All-Sky Automated Survey for Supernovae (ASAS-SN). Using the Lomb-Scargle periodogram and 2DHybrid method, we detected the significant periodicity of ~ 1.1 yr beyond a damped random walk model in the CRTS+ASAS-SN optical data set. Mrk 231 has been previously proposed as a SMBBH candidate with a highly unequal mass ratio (q~ 0.03), very tight mutual separation of ~590 AU, and an orbital period of ~1.2 yr. Hence, our result further supports, even though not prove, the intriguing hypothesis that SMBBHs with low mass ratios may be more common than close-equal mass SMBBHs. This result, however, was obtained from the contribution of CRTS data with limited sampling cadence and photometric accuracy, and further monitoring of Mrk 231 is crucial to confirm the periodicity.
