项目名称: 活动星系核演化的多波段研究:从中心黑洞到宿主星系
项目编号: No.10803008
项目类型: 青年科学基金项目
立项/批准年度: 2009
项目学科: 生物科学
项目作者: 王竞
作者单位: 中国科学院国家天文台
项目金额: 22万元
中文摘要: 本项目利用多波段观测数据围绕活动星系核与宿主星系的共同演化这一课题开展了一系列研究工作。我们的研究结果从多方面揭示了活动星系核与宿主星系之间的演化联系。利用部分遮蔽活动星系核的光谱特性首次在宽线活动星系核中清晰地给出了活动星系核与宿主星系之间的演化联系,尝试建立了活动星系核的演化序列。在此基础上,结合红外样本以及核塌超新星的宿主星系给出了清晰的证据表明存在两类具有不同中心能源机制的LINER,而它们很可能处于不同的演化阶段。我们还首次利用窄发射星系的谱线轮廓研究了外向流与宿主星系星族年龄之间的联系,其结果揭示了外向流与宿主星系之间也存在共同演化的联系。利用2.16米望远镜建立了RXTE/INTEGRAL硬X-射线选I型活动星系核样本光学光谱样本,样本分析表明尽管硬X-射线光度和活动星系核热光度/发射线光度之间存在很好的相关性,但是它们的Eddington比通常偏大;中性氢柱密度偏小。造成这一结果的原因很可能是由硬X射线巡天的选择效应导致的。这一结果对于未来的硬X射线巡天项目具有一定的借鉴意义。
中文关键词: 活动星系核;多波段天文学;星系;统计方法
英文摘要: The series studies were carried out on the AGN-host coevolution issue by using multi-wavelength observations. The evolutionary connection is supported by our results fome servral aspects. Taking the advantage of partially obscured AGNs, the evolutionary sequence is established in type I AGNs for the first time. Combinning the partially obscured AGNs, IR-selected galalxies and the host of core-collapse SN suggests that there are two LINER populations with different line-excitation mechanisms,which implies that they are at different evolutionary stages. The evolutionary significance of outflow in AGNs is suggested by our line profile modeling in narrow-line AGNs. A large spectroscopic sample is obtained by the 2.16m telescope for the RXTE/INTEGRAL hard X-ray selected AGNs. The analysis shows a significant correlation between the hard X-ray luminosity and bolometric/line luminosity. Howerver, the sample is baised towards high Eddington ratio and low HI column density, which is likely casued by the selection effect of the survey. This result is meaningful for future Hard X-ray survey project.
英文关键词: AGN; multi-wavelenth astronomy; gaalxies; statistics