{"title":"Kinematic Models of BLR Gas and Line Profiles of HeIλ5876 and Hβ in AGNs","authors":"S. Xue, F. Cheng, J. Kwan","doi":"10.1360/YA1994-37-4-487","DOIUrl":null,"url":null,"abstract":"The present paper derives the modified expression of broad emission line profiles for the kinematic model of radiation pressure driving BLR gas outflow in the BLR, and discusses the intrinsic emission difference between the two lines HeIλ5876 and Hβ. It is shown that the fact that the observed line width of HeIλ5876 is broader than that of Hβ cannot be explained by W. G. Mathews' modified model. For comparison, line profiles of gravitational infall model and orbital disk model are also calculated; the latter is in good agreement with the observations. Thereupon, conclusion is reached that gravitational infall is an important process in the BLR gas motion.","PeriodicalId":256661,"journal":{"name":"Science in China Series A-Mathematics, Physics, Astronomy & Technological Science","volume":"97 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1994-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science in China Series A-Mathematics, Physics, Astronomy & Technological Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1360/YA1994-37-4-487","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
The present paper derives the modified expression of broad emission line profiles for the kinematic model of radiation pressure driving BLR gas outflow in the BLR, and discusses the intrinsic emission difference between the two lines HeIλ5876 and Hβ. It is shown that the fact that the observed line width of HeIλ5876 is broader than that of Hβ cannot be explained by W. G. Mathews' modified model. For comparison, line profiles of gravitational infall model and orbital disk model are also calculated; the latter is in good agreement with the observations. Thereupon, conclusion is reached that gravitational infall is an important process in the BLR gas motion.
本文导出了BLR内辐射压力驱动气体流出的运动模型的广义发射谱线的修正表达式，并讨论了HeIλ5876和Hβ两条谱线的本征发射差。结果表明，HeIλ5876观测到的谱线宽度比Hβ谱线宽这一事实不能用W. G. Mathews的修正模型来解释。为了比较，还计算了引力落模型和轨道盘模型的线轮廓;后者与观测结果非常吻合。由此得出结论:引力落体是BLR气体运动的一个重要过程。
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