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arXiv 1410.0902astro-ph.GA
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成组的AGN螺旋星系:棒的影响

AGN spiral galaxies in groups: effects of bars

Sol Alonso, Georgina Coldwell, Diego García Lambas

摘要:

我们探讨了从SDSS-DR 7中选出的棒旋星系群的性质,目的是评估棒对活动星系核的影响和高密度环境的作用。我们从SDSS-DR 7星群表中识别出了分布在不同星群中的棒旋活动星系。为了提供一个合适的量化酒吧的影响,一个可靠的控制样本的无阻活动星系在高密度的环境中具有相似的红移,幅度,形态和凸起的大小分布。我们发现,集团中的棒旋星系所占的比例(~ 38%)高于总样本中的棒旋星系所占的比例(~ 28%),这表明集团中的AGN旋涡星系比场中的AGN旋涡星系更有可能是棒旋星系。我们还发现,有棒活动星系核星系更集中向集团中心比其他unbarred活动星系核集团成员。此外,棒斑活动星系核的宿主星系呈现出以红色为主的过剩粒子数,这表明棒斑对活动星系核宿主星系的颜色有重要影响。与相应的无棒活动星系群相比,有棒活动星系核的主星系群呈现出更大比例的红色。这两个主机组的AGN的颜色-星等关系显着不同:主机组的颜色的酒吧活动星系显示分布向红色人口,相对于主机组的无酒吧AGN对象。与没有棒的星系相比,有棒的活动星系显示出过量的核活动。我们发现离团中心较远的棒斑活动星系有较强的Lum[OIII]。我们的研究结果表明,在高密度环境中,酒吧向AGN星系的更中心的区域运输材料的效率揭示了一个重要的依赖于组内的对象的本地化和主机组的颜色。

英文摘要:

We explore properties of barred active spiral galaxies in groups selected from the SDSS-DR7, with the aim of assessing the effects of bars on AGN and the role of the high density environment. We identified barred active galaxies that reside in groups from SDSS-DR7 group catalog. To provide a suitable quantification of the effects of bars, a reliable control sample of unbarred active galaxies in high density environments with similar redshift, magnitude, morphology, and bulge size distributions was constructed. We found that the fraction of barred AGN galaxies in groups (~ 38 %) is higher than those in the total barred AGN sample ( ~ 28 %), indicating that AGN spiral galaxies in groups are more likely to be barred than those in the field. We also found that barred AGN galaxies are more concentrated towards the group centers than the other unbarred AGN group members. In addition, barred AGN host galaxies show an excess of population dominated by red colors suggesting that bars produce an importanteffect on galaxy colors of AGN hosts. The host groups of the barred AGN exhibit a larger fraction of red colors than the host groups of the corresponding unbarred active galaxies. Color-magnitude relations of both host groups of AGN differ significantly: the host group colors of barred active galaxies display distributions spreading toward red populations, with respect to the host groups of the unbarred AGN objects. Barred active galaxies show an excess of nuclear activity compared to galaxies without bars. We found that barred active galaxies located farther from the group-center have stronger Lum[OIII]. Our findings suggest that the efficiency of bars to transport material towards the more central regions of the AGN galaxies in high density environments reveals an important dependence on the localization of objects within the group and on the host group colors.

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