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

作　　者：Xiaozhi Lin Yongquan Xue Guanwen Fang Lulu Fan Huynh Anh N Le Ashraf Ayubinia 

机构地区：[1]CAS Key Laboratory for Research in Galaxies and Cosmology,Department of Astronomy,University of Science and Technology of China,Hefei 230026,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [3]School of Mathematics and Physics,Anqing Normal University,Anqing 246133,China [4]Shandong Provincial Key Lab of Optical Astronomy and Solar-Terrestrial Environment,Institute of Space Science,Shandong University,Weihai,264209,China

出　　处：《Research in Astronomy and Astrophysics》2022年第1期104-113,共10页天文和天体物理学研究（英文版）

基　　金：support from the National Natural Science Foundation of China (grant Nos. 12025303, 11890693,11421303 and 12003031);the CAS Frontier Science Key Research Program (QYZDJ-SSW-SLH006);the K.C. Wong Education Foundation;the science research grants from the China Manned Space Project with No. CMS-CSST-2021-A06;support from the Chinese Academy of Sciences President’s International Fellowship Initiative (grant No. 2019PM0020)。

摘　　要：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.

关 键 词：galaxies:active galaxies:formation galaxies:evolution galaxies:high-redshift galaxies:nuclei (galaxies:)quasars:supermassive black holes galaxies:star formation galaxies:statistics 

分 类 号：P152[天文地球—天文学]