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arXiv 2109.11084astro-ph.GA
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MaNGA星系对中活动星系核的IFU观点

An IFU View of the Active Galactic Nuclei in MaNGA Galaxy Pairs

Gaoxiang Jin, Y. Sophia Dai, Hsi-An Pan, Lihwai Lin, Cheng Li, Bau-Ching Hsieh, Shiyin Shen, Fang-Ting Yuan, Shuai Feng, Cheng Cheng, Hai Xu, Jia-Sheng Huang, Kai Zhang

摘要:

活动星系核(AGN)在星系相互作用中的作用以及它们如何影响系统中的恒星形成仍然存在争议。我们使用的样本1156星系星系对或合并(以下简称“对”)从MANGA调查。该对样本通过速度偏移、投影分离和形态学来选择,并且基于形态学签名沿着合并序列被进一步分类为四种情况。然后,我们确定共61(5.5%)AGN的基础上对发射线诊断。无论是沿着合并序列还是与孤立星系相比(5.0%),都没有发现活动星系核部分的演化。我们观察到更高比例的被动星系的星系对,特别是在合并前的情况下,并关联到它们的环境依赖性的更高的分数。孤立的活动星系核和成对的活动星系核在它们的整体恒星质量、恒星形成率(SFR)和中心[OIII]表面亮度方面显示出相似的分布。成对活动星系核的径向分布特征是从中心到外围比SFR逐渐增大,Dn4000逐渐减小,与孤立活动星系核没有显著差异。这与我们对样本中的恒星形成星系(SFG)明显不同,SFG显示出增强的中心恒星形成,如之前所报道的那样。成对的活动星系核在外围区域有较低的巴耳末衰减,可能表明尘埃衰减较少。我们的研究结果表明,活动星系核可能遵循由内而外的淬火和合并的影响,在活动星系核的恒星形成是不突出的SFG。

英文摘要:

The role of active galactic nuclei (AGNs) during galaxy interactions and how they influence the star formation in the system are still under debate. We use a sample of 1156 galaxies in galaxy pairs or mergers (hereafter `pairs') from the MaNGA survey. This pair sample is selected by the velocity offset, projected separation, and morphology, and is further classified into four cases along the merger sequence based on morphological signatures. We then identify a total of 61 (5.5%) AGNs in pairs based on the emission-line diagnostics. No evolution of the AGN fraction is found, either along the merger sequence or compared to isolated galaxies (5.0%). We observe a higher fraction of passive galaxies in galaxy pairs, especially in the pre-merging cases, and associate the higher fraction to their environmental dependence. The isolated AGN and AGN in pairs show similar distributions in their global stellar mass, star formation rate (SFR), and central [OIII] surface brightness. AGNs in pairs show radial profiles of increasing specific SFR and declining Dn4000 from center to outskirts, and no significant difference from the isolated AGNs. This is clearly different from star-forming galaxies (SFGs) in our pair sample, which show enhanced central star formation, as reported before. AGNs in pairs have lower Balmer decrements at outer regions, possibly indicating less dust attenuation. Our findings suggest that AGNs likely follow an inside-out quenching and the merger impact on the star formation in AGNs is less prominent than in SFGs.

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