3C273宽线云中HI区域温度、Lyα线强度与谱指数的相关性  

CORRELATIONS BETWEEN TEMPERATURE OF HI ZONE IN THE CLOUD OF BLR, LINE INTENSITY OF Lyα OF QUASAR 3C273 AND ITS UV SPECTRAL INDEX

作　　者：程富华[1] 尤峻汉[2] 晏明[2] 

机构地区：[1]Center for Astronomy and Astrophysics,CCAST(World Laboratory) [2]中国科学技术大学天体物理中心

出　　处：《天文学报》1989年第3期236-240,共5页Acta Astronomica Sinica

基　　金：国家自然科学基金

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R_2;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.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, R_2; 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.

关 键 词：类星体 宽线云 温度 Ly线 谱指数 

分 类 号：P158[天文地球—天文学]