AGN Lifetimes in UV-selected Galaxies: A Clue to Supermassive Black Hole-galaxy Coevolution

The coevolution between supermassive black holes (SMBHs) and their host galaxies has been proposed for more than a decade, albeit with little direct evidence about black hole accretion activities regulating galaxy star formation at z > 1. In this paper, we study the lifetimes of X-ray active gala...

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Published in:Research in astronomy and astrophysics 2022-01, Vol.22 (1), p.15010
Main Authors: Lin, Xiaozhi, Xue, Yongquan, Fang, Guanwen, Fan, Lulu, Le, Huynh Anh N, Ayubinia, Ashraf
Format: Article
Language:English
Subjects:
(galaxies:) quasars: supermassive black holes
Accretion
Active galactic nuclei
Black holes
Color
Deposition
Galactic evolution
Galaxies
galaxies: active
galaxies: evolution
galaxies: formation
galaxies: high-redshift
galaxies: nuclei
galaxies: star formation
galaxies: statistics
Space telescopes
Star & galaxy formation
Star formation
Stars & galaxies
Supermassive black holes
Time
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Summary:The coevolution between supermassive black holes (SMBHs) and their host galaxies has been proposed for more than a decade, albeit with little direct evidence about black hole accretion activities regulating galaxy star formation at z > 1. In this paper, we study the lifetimes of X-ray active galactic nuclei (AGNs) in UV-selected red sequence (RS), blue cloud (BC) and green valley (GV) galaxies, finding that AGN accretion activities are most prominent in GV galaxies at z ∼ 1.5–2, compared with RS and BC galaxies. We also compare AGN accretion timescales with typical color transition timescales of UV-selected galaxies. We find that the lifetime of GV galaxies at z ∼ 1.5–2 is very close to the typical timescale when the AGNs residing in them stay in the high-accretion-rate mode at these redshifts; for BC galaxies, the consistency between the color transition timescale and the black hole strong accretion lifetime is more likely to happen at lower redshifts ( z < 1). Our results support the scenario where AGN accretion activities govern UV color transitions of host galaxies, making galaxies and their central SMBHs coevolve with each other.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/ac3414