星系研究组知识库

观测到了BLLac天体Mark421在光学波段的短时标爆发.在26min的爆发期间内,Mark421从B=1576mag到B=1432mag迅速变化了134mag.更为有趣的是观测结果与1996年由Gaidos等观测到的TeVγ射线爆发的结果非常相似,特别是在时标变化和光变曲线等方面两者有相同之处.由上述观测数据结果可以得出:爆发产生于相同的发射区域,这个区域为R=59×1011m,并由此推导出Mark421中心黑洞质量为M=3×106M⊙,这对目前的γ辐射理论模型提出了新的挑战,可以认为Mark421的TeVγ射线来自于同步的康普顿辐射

We report the observation of a dramatic outburst in the optical band from the BL Lac object Markarian 421(Mark 421). During this outburst, the brightness of Mark 421 increased rapidly by 1.34mag from B = 5.67 to B = 14.32 in 26 min. Another interesting fact is that this extremely rapid burst in the optical band is similar to the dramatic outburst of TeV photons which was obtained by Gaidos et al.(1996) in every essential respect, for example, the time scales on which they vary, and the shapes of the light curves. These data in the optical band and TeV gamma-rays suggest that they are both produced in the same emission region, and that the emission region is extremely small, R = 1.23 x 10(12)m. With these results, we prove that there is a massive black hole with M similar or equal to 2 x 10(6) M. in the center of Mark 421. This could provide a new challenge for current theoretical model of such emissions. We prove that the origin of TeV gamma-rays is by synchotron self-Compton.