项目名称: 大样本2型类星体光学光谱性质和中心黑洞质量的研究
项目编号: No.11303008
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 孔民芝
作者单位: 河北师范大学
项目金额: 28万元
中文摘要: 研究2型类星体不仅可以验证活动星系核统一模型,也可以了解不同类型活动星系核(AGN)之间的演化情况,为星系和黑洞如何共同生长和演化提供重要信息。由于2型类星体尘埃环遮挡了来自核心的光,导致目前发现的这类天体的数量还不是很多,对它们的研究还不是很深入全面。本课题首次利用目前光学选2型类星体最大的样本,获得[O II]、[O III]、[S II]等低电离发射线的速度弥散和核球恒星速度弥散的关系,研究2型类星体窄线区气体的运动状态,分析窄线区气体的和核球恒星的速度弥散与爱丁顿率、热光度的关系;探讨利用窄线区气体谱线的性质估算2型类星体中心黑洞质量的可行性;通过分析低电离发射线的蓝移现象,研究2型类星体窄线区气体运动状态的性质与中心黑洞质量、密度、温度等物理参数的联系,并和其他类型AGN的相关研究结果比较,为不同类型AGN的演化和检验AGN统一模型提供重要的研究信息。
中文关键词: 黑洞质量;二型类星体;爱丁顿率;统一模型;AGNs演化模型
英文摘要: Type 2 quasars are important for studyies of active galactic nucleus(AGNs). They can provide information about testing AGNs unified model, and can be a powerful tool for studying the evoluions of different types of AGNs and how the coevolution between black hole growth and galaxy formation. Number of discorvered type 2 quasars is limited at present and investigation about it is also limited. Using the largest type 2 quasar sample of optical spectra downloaded from sloan digital sky survey, we will systematically analysed their central black hole masses and properties of optical emission lines and absorption lines, like velocity dispersions, luminosity, line intensity, Eddingtion ratio, black hole mass, and etc and also their relations between different physical parameters. We expect to find physical reasons behind them, and then to compare them with the relevant results about other type AGNs and to find link between different type AGNs and to provide informations about testing the AGN unified model.
英文关键词: black hole mass;type 2 Qsos;Eddington ratio;the unified model;AGNs evolution model