论文标题
关于在标准光学诊断图中AGN星系的宿主特性和环境的关系
On the relation of host properties and environment of AGN galaxies across the standard optical diagnostic diagram
论文作者
论文摘要
我们研究了$ \ text {[o iii]}/\ text {h}β$ vs $ vs $ \ vs $ \ text {[n ii]}/\ text {h H} {我们根据Kauffmann等人选择了定义为平行于BPT图上的恒星形成基因座的AGN子样本。和Schawinski等。标准。对于平行的子样本，我们发现AGN宿主特性表现出形态的演化，因为它们变得更加距离恒星形成序列。局部密度环境比含有衬里和塞弗特人的局部样本显示了主要由复合和螺旋星系形成的子样本的形态密度关系更明显，而AGN发射是主要来源。我们还分析了观察到环境没有显着差异的五个最接近的AGN邻居的性质，尽管每个子样本的AGN宿主特性都有明显的变化。属于垂直子样本的AGN在图表上从左上到右底部的宿主特性上显示出明显的差异。但是，对局部密度环境的分析并不能反映对宿主AGN特性的强烈依赖性。 AGN邻近星系的特征加强了该结果。这些发现表明，混合的AGN/恒星星系具有与非活动星系更相似的环境特征。但是，随着较为发展的星系中心的AGN成为主要来源，环境倾向于为中央黑洞的喂养提供适当的条件，并具有越来越多的气体含量和更高的合并速率的可能性。
We study the host properties and environment of active galactic nuclei (AGNs) galaxies, taken from SDSS-DR12, across the $\text{[O III]}/\text{H}β$ vs $\text{[N II]}/\text{H}α$ diagnostic diagram. We select AGN subsamples defined as parallel and perpendicular to the star-forming locus on the BPT diagram based on the Kauffmann et al. and Schawinski et al. criteria. For parallel subsamples we find that AGN host properties exhibit a morphological evolution as they become more distant to the star-forming sequence. The local density environment shows a more evident morphology-density relationship for subsamples mainly formed by Composite and Spiral galaxies than those containing LINERs and Seyferts, where the AGN emission is the dominant source. We also analyse the properties of the five closest AGN neighbours observing no significant differences in the environment, although the AGN host properties of every subsample have noticeable variations. The AGNs belonging to perpendicular subsamples show clear differences on their host properties from left top to right bottom on the diagram. However, the analysis of the local density environment do not reflect strong dependency with the host AGN properties. This result is reinforced by the characteristics of the AGN neighbouring galaxies. These findings suggest that mixed AGN/star-forming galaxies present environmental features more similar to that of non-active galaxies. However, as AGNs at the centre of the more evolved galaxies become the dominant source, the environment tends to provide suitable conditions for the central black hole feeding with an increasing content of gas and likelihood of a higher merger rate.
