【摘要】 本文用IUE天文台的类星体3C 273的紫外监测资料,测量了该源不同时间紫外光谱中Lyα线的强度f（Lyα）,并且估测了"切仑柯夫红移",定出了能级2的粒子数布居R₂;综合观测到的线强比I（H_α）/I（H_β）和I（Lyα）/I（H_β）,定出了3C 273在三个不同时间的宽线云HI区温度T分别为12000K,9100K和8600K,这些T值与紫外谱指数α_uv明显相关,且α_uv与f（Lyα）有单调递增关系,表明了用切仑柯夫线辐射理论解释类星体宽线区模型能与观测相符.反过来,这种与观测相符的解释也是对切仑柯夫线辐射理论的有力支持.更多还原

【Abstract】 Using IUE observations of quasar 3C273 we measured the intensity of the Lyα line, f（Lyα）, and estimate the Cerenkov redshift of Lyα emission line from its UV spectra with different observing times. We also determined the particle population at 2nd energy level, R₂; Combining the observed intensity ratios I（H_α）/I（H_β） and I（Lyα）/I（H_β） we estimated the temperatures of the HI zone in the cloud of BLR to be 12000 K, 9100 K and 8600 K at three different observing times. These temperatures estimated are obviously correlated with the UV spectral indexes α_uv, and the f（Lyα） decreases with decreasing α_uv. These show that the model of BLR described by the Cerenkov line emission theory is in good agreement with the observations. On the other hand the good agreement is one of the strong supports to the Cerenkov line emission theory itself.更多还原