SDSS J0159+0105: A RADIO-QUIET QUASAR WITH A CENTI-PARSEC SUPERMASSIVE BLACK HOLE BINARY CANDIDATE
SDSS J0159+0105: A RADIO-QUIET QUASAR WITH A CENTI-PARSEC SUPERMASSIVE BLACK HOLE BINARY CANDIDATE
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DOI：
10.3847/0004-637x/827/1/56
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发表时间：
2015-12
期刊：
影响因子：
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通讯作者：
Zhen-ya Zheng;N. Butler;Yue Shen;Linhua Jiang;Junxian Wang;Xian Chen;J. Cuadra
中科院分区：
文献类型：
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作者：
Zhen-ya Zheng;N. Butler;Yue Shen;Linhua Jiang;Junxian Wang;Xian Chen;J. Cuadra
我们在z = 0.217的射电安静类星体SDSS J0159+0105中发现了候选的厘米-秒差距超大质量黑洞双星（SMBHB）。通过改进的Lomb-Scargle编码（GLSdeDRW）和自相关分析，我们从该类星体的8.1年Catalina v波段光曲线中检测到两个显著的（P > 99%）周期信号，分别发生在~ 741天和~ 1500天。根据最近的数值模拟，周期比接近1:2，是典型的质量比为0.05 < q < 0.8的黑洞双星系统。SDSS J0159+0105有两次SDSS光谱观测，间隔约10年。在这两个时期之间，宽Hβ谱线发生了显著变化，这可以用前面提到的小圆盘照亮的双星系统周围的单一宽线区域（BLR）来解释，或者可以用气体流从环双星盘向其中一个SMBHs流动来解释。根据单BLR假设和轨道周期为~ 1500天，我们估计了MSMBHB的总病毒质量~ 1.3 × 108 M⊙，BLR的平均距离为~ 0.04 pc （~ 50 lt-day，±0.3指数不确定度），SMBHB的间隔为d = (0.01 pc) (Trest/3.3 yr)2/3 ~ 0.013 pc （15 lt-day）。根据分析工作，假设的环双星盘的内半径为2d = 0.026 pc （30 lt-day）。SDSS J0159+0105也显示出不同寻常的光谱能量分布。SDSS J0159+0105的独特性质与它是一个厘秒差距的SMBHB相一致。
We report a candidate centi-parsec supermassive black hole binary (SMBHB) in the radio-quiet quasar SDSS J0159+0105 at z = 0.217. With a modified Lomb–Scargle code (GLSdeDRW) and auto-correlation analysis, we detect two significant (at P > 99%) periodic signals at ∼741 day and ∼1500 day from the 8.1 yr Catalina V-band light curve of this quasar. The period ratio, which is close to 1:2, is typical of a black hole binary system with a mass ratio of 0.05 < q < 0.8 according to recent numerical simulations. SDSS J0159+0105 has two SDSS spectroscopic observations separated by ∼10 yr. There is a significant change in the broad Hβ profile between the two epochs, which can be explained by a single broad-line region (BLR) around the binary system illuminated by the aforementioned mini-disks, or a stream of gas flowing from the circumbinary disk to one of the SMBHs. From the single BLR assumption and the orbital period torb ∼ 1500 day, we estimate the total virial masses of MSMBHB ∼ 1.3 × 108 M⊙, the average distances of BLR of ∼0.04 pc (∼50 lt-day, with ±0.3 dex uncertainty), and an SMBHB separation of d = (0.01 pc) (Trest/3.3 yr)2/3 ∼ 0.013 pc (15 lt-day). Based on analytical work, the postulated circumbinary disk has an inner radius of 2d = 0.026 pc (30 lt-day). SDSS J0159+0105 also displays unusual spectral energy distribution. The unique properties of SDSS J0159+0105 are consistent with it being a centi-parsec SMBHB.