摘要
本文从Ⅰ型Seyfert星系在双色图上的行为出发,假定可见光与紫外波段连续谱的主要成分包括幂律非热致辐射、黑体辐射、宽线区Balmer连续谱的复合辐射和高阶Balmer线辐射,计算了这些发射机制的参数,发现结果与从分光光度测量决定的参数符合很好。因此,本文结果对已测定色指数的Ⅰ型Seyfert星系可决定出其热致成分(黑体谱和Balmer连续谱)在全部辐射中占的比重;给出了研究类星体的可见光与紫外波段辐射机制的新方法。
Assuming that the main continuum emission mechanisms of type I Seyfert galaxies in visual and UV bands are power-law nonthermal emission, blackbody emission, recombination emission of Balmer continuum in the broad line region and high order Balmer line emission, we calculate the parameters of these mechanisms from their color indices (U-B, B-V) and find that the results agree with those obtained from the spectrophotometric measure. Therefore we can determine the ratio of the thermal component to the whole emission for Sy I galaxies with the values of colour indices and give a method to study emission mechanism of QSOs in visual and UV bands.
基金
国家自然科学基金
