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arXiv 1111.4084astro-ph.CO
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塞弗特星系的邻居的活动

The Activity of the Neighbours of Seyfert Galaxies

E. Koulouridis, M. Plionis, V. Chavushyan, D. Dultzin, Y. Krongold, I. Georgantopoulos, J. Leon-Tavares

摘要:

我们提出了一个后续研究的一系列文件的作用密切的相互作用作为一个可能的触发机制活动星系核活动。我们已经研究了Sy 1、Sy 2和亮IRAS星系(BIRG)的本地样本及其各自的对照样本的近尺度(<100 kpc/h)和大尺度(<1 Mpc/h)环境。结果使我们得出结论,近距离接触似乎能够激活一个序列,其中吸收线星系(ALG)星系首先成为星暴,然后是Sy 2,最后是Sy 1。在这里,我们调查不同类型的活动星系核的邻近星系的活动,因为两个星系的相互作用对应该受到影响。为此,我们提出的光谱和X射线成像的30个邻近星系周围的两个本地(z<0.034)的10个Sy 1和13个Sy 2星系的样本。基于光谱学,我们发现超过70%的邻近星系表现出恒星形成和/或核活动(即最近的恒星形成和/或活动星系核),而额外的X射线分析表明,这一比例可能显着更高。此外,我们还发现邻近星系的[OIII]/Hβ比值与中心活动星系的活动类型之间存在99.9%的统计学显著相关性,即Sy 2星系的邻近星系比Sy 1星系的邻近星系系统性地更电离。这一结果,结合使用Hα发射线的等效宽度和恒星星族合成代码STARLIGHT发现的趋势,表明样品之间的恒星质量,金属丰度和恒星形成历史存在差异。我们的研究结果指出了密切的星系相互作用和活动之间的联系,也提供了更多的线索,关于我们以前的研究推断的可能的进化序列。

英文摘要:

We present a follow-up study on a series of papers concerning the role of close interactions as a possible triggering mechanism of AGN activity. We have already studied the close (<100kpc/h) and the large scale (<1 Mpc/h) environment of a local sample of Sy1, Sy2 and bright IRAS galaxies (BIRG) and their respective control samples. The results led us to the conclusion that a close encounter appears capable of activating a sequence where an absorption line galaxy (ALG) galaxy becomes first a starburst, then a Sy2 and finally a Sy1. Here we investigate the activity of neighboring galaxies of different types of AGN, since both galaxies of an interacting pair should be affected. To this end we present the optical spectroscopy and X-ray imaging of 30 neighbouring galaxies around two local (z<0.034) samples of 10 Sy1 and 13 Sy2 galaxies. Based on the optical spectroscopy we find that more than 70% of all neighbouring galaxies exhibit star forming and/or nuclear activity (namely recent star formation and/or AGN), while an additional X-ray analysis showed that this percentage might be significantly higher. Furthermore, we find a statistically significant correlation, at a 99.9% level, between the value of the neighbour's [OIII]/Hβratio and the activity type of the central active galaxy, i.e. the neighbours of Sy2 galaxies are systematically more ionized than the neighbours of Sy1s. This result, in combination with trends found using the Equivalent Width of the Hαemission line and the stellar population synthesis code STARLIGHT, indicate differences in the stellar mass, metallicity and star formation history between the samples. Our results point towards a link between close galaxy interactions and activity and also provide more clues regarding the possible evolutionary sequence inferred by our previous studies.

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