类星体3C 273光学波段的周期分析

The Period Analysis for Quasar 3C 273 in the Optical Band

搜集了类星体3C 273在光学B波段近100 yr的数据,得出光变曲线,并在此基础上应用Period04软件对它的光变周期进行了分析.发现光变曲线中存在周期为T1=2.06 yr、T2=13.03 yr及T3=21.15 yr的3个光变周期,这与Fan等人的结论(3C 273的光学B波段存在2.0 yr、(13.65±0.20)yr及(22.5±2.0)yr的周期)基本上是一致的.然后用这3个周期再次拟合观测数据做一个周期反演,周期拟合曲线与观测数据的爆发周期规律基本一致,说明这3个周期是比较可靠的.并通过其长周期可以得出其中心黑洞质量为M=1.87×106M⊙,最后讨论了其中心黑洞质量以及3C 273产生这种周期的可能机制.

The data of quasar 3C 273 in the optical B band have been collected for nearly I00 years. Based on the obtained light curve, we analyze the period of light variation using the Period04 software. It is found that there are three periods of light variation in the light curve, including 2.06 years, 13.03 years, and 21.15 years, respectively. These are basically consistent with the conclusion of Fan and others, in which the periods of 3C 273 in the optical B band are 2.0 years, （13.65±0.20） years, and （22.5±2.0） years. Then, a cycle inversion is carried out, and the observed data are fitted by using these three periods. It is basically consistent between the characteristic of the period fitting curve and the outbreak period of the observed data, which indicates that these three periods are reliable. And with its long cycle, it is derived that the mass of the central black hole is estimated as M = 1.87 × 10^6 M⊙. Finally, we discuss its central black hole mass and the possible mechanism responsible for this period of 3C 273.