AGN accretion and black hole growth across compact and extended galaxy evolution phases
AGN accretion and black hole growth across compact and extended galaxy evolution phases
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致密星系和扩展星系演化阶段的活动星系核吸积和黑洞生长
DOI：
10.1093/mnras/stac2103
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发表时间：
2022
影响因子：
4.8
通讯作者：
Aird J
中科院分区：
文献类型：
--
作者：
Aird J
黑洞在星系不同演化阶段的增长程度以及星系致密性和活动星系核(AGN)活动之间的联系仍然知之甚少。我们使用哈勃太空望远镜成像的CANDELS场来识别z=0.5-3的恒星形成和静止星系，并使用ChandraX-射线成像来测量活动星系核的吸积率分布和跟踪这些星系中的黑洞增长。我们表明，考虑到活动星系核的光的影响，∼20% 的X射线源从致密星系分类到扩展星系分类。我们发现，∼10-25%的致密恒星形成星系拥有活动星系核，与扩展的恒星形成星系或具有同等恒星质量和红移的致密静止星系相比，略有增强(增加了∼2倍)。然而，活动星系核在致密的恒星形成星系中并不普遍，鉴于其相对较短的时间尺度，这并不是进化阶段，黑洞质量增长的大部分发生在那里。相反，我们测量了相对罕见的扩展静止星系中最高的活动星系核分数(∼10-30 Cent)。对于在早期宇宙纪元熄灭的大质量星系来说，黑洞在这个扩展阶段的实质性增长对于产生在z∼0时观察到的静止星系的黑洞质量到星系质量的比例关系是至关重要的。我们还发现，在恒星形成的星系中，活动星系核的比例随着致密程度的增加而增加，而在静止的星系中，无论是在紧凑的亚群中还是在扩展的亚群中，活动星系核的比例都在下降，这说明活动星系核的活动与星系的结构性质密切相关。
The extent of black hole growth during different galaxy evolution phases and the connection between galaxy compactness and active galactic nucleus (AGN) activity remain poorly understood. We useHubble Space Telescopeimaging of the CANDELS fields to identify star-forming and quiescent galaxies atz= 0.5–3 in both compact and extended phases and useChandraX-ray imaging to measure the distribution of AGN accretion rates and track black hole growth within these galaxies. We show that accounting for the impact of AGN light changes ∼20 per cent of the X-ray sources from compact to extended galaxy classifications. We find that ∼10–25 per cent of compact star-forming galaxies host an AGN, a mild enhancement (by a factor ∼2) compared to extended star-forming galaxies or compact quiescent galaxies of equivalent stellar mass and redshift. However, AGNs are not ubiquitous in compact star-forming galaxies and this is not the evolutionary phase, given its relatively short time-scale, where the bulk of black hole mass growth takes place. Conversely, we measure the highest AGN fractions (∼10–30 per cent) within the relatively rare population of extended quiescent galaxies. For massive galaxies that quench at early cosmic epochs, substantial black hole growth in this extended phase is crucial to produce the elevated black hole mass-to-galaxy stellar mass scaling relation observed for quiescent galaxies atz∼ 0. We also show that AGN fraction increases with compactness in star-forming galaxies and decreases in quiescent galaxieswithinboth the compact and extended subpopulations, demonstrating that AGN activity depends closely on the structural properties of galaxies.
天文学和天体物理学年度评论简介
影响因子：
6.5
作者：
E. Dishoeck;R. Kennicutt
通讯作者：
R. Kennicutt