BL Lac1727+502的研究

Study of the BL Lac Object 1727+502

用吸积盘和同步加速辐射模型分析了BL Lac天体1727+502的IR-Optical-UV波段的同时观测数据.预言了1727+502中心存在黑洞,将黑体辐射谱和f=ν-α谱迭加所得辐射谱与1727+502的实际辐射谱基本一致,并由此得到吸积盘的温度大约20 000 K.若假设吸积率M&=10-3M⊙/yr,则中心黑洞质量M8≈4.94.

Accretion disc and synchrotron models have been used to analyse simultaneous IR-optical-UV data of the BL Lac object 1727＋502. It was predicted that there was black hole in the center of the BL Lac object 1727＋502. The spectra of the intrinsic spectrum （f=v^-α） plus black body emission spectrum was consistent with observed spectrum of 1727＋502, and the temperature of the disc was about 20 000 K. If M =10^-3M⊙/yr was assumed, the mass（Ms） of the central black hole was about 4.94,