Evidence for a mass-dependent AGN Eddington ratio distribution via the flat relationship between SFR and AGN luminosity
Evidence for a mass-dependent AGN Eddington ratio distribution via the flat relationship between SFR and AGN luminosity
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通过恒星形成率和活动星系核光度之间的平坦关系证明质量相关的活动星系核爱丁顿比分布
DOI:
10.1093/mnras/sty219
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发表时间:
2018
影响因子:
4.8
通讯作者:
Bernhard E
中科院分区:
文献类型:
--
作者:
Bernhard E
The lack of a strong correlation between AGN X-ray luminosity (LX; a proxy for AGN power) and the star formation rate (SFR) of their host galaxies has recently been attributed to stochastic AGN variability. Studies using population synthesis models have incorporated this by assuming a broad, universal (i.e. does not depend on the host galaxy properties) probability distribution for AGN specific X-ray luminosities (i.e. the ratio ofLXto host stellar mass; a common proxy for Eddington ratio). However, recent studies have demonstrated that this universal Eddington ratio distribution fails to reproduce the observed X-ray luminosity functions beyondz∼ 1.2. Furthermore, empirical studies have recently shown that the Eddington ratio distribution may instead depend upon host galaxy properties, such as SFR and/or stellar mass. To investigate this further, we develop a population synthesis model in which the Eddington ratio distribution is different for star-forming and quiescent host galaxies. We show that, although this model is able to reproduce the observed X-ray luminosity functions out toz∼ 2, it fails to simultaneously reproduce the observed flat relationship between SFR and X-ray luminosity. We can solve this, however, by incorporating a mass dependency in the AGN Eddington ratio distribution for star-forming host galaxies. Overall, our models indicate that a relative suppression of low Eddington ratios (λEdd≲ 0.1) in lower mass galaxies (M*≲ 1010 − 11M⊙) is required to reproduce both the observed X-ray luminosity functions and the observed flat SFR/X-ray relationship.
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影响因子:
4.8
作者:
M. Veale;M. White;C. Conroy
通讯作者:
C. Conroy
影响因子:
64.8
作者:
J. Kormendy;Ralf Bender;M. Cornell
通讯作者:
J. Kormendy;Ralf Bender;M. Cornell
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
DOI:
10.3847/1538-4357/aa7632
发表时间:
2017
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Mackenzie L. Jones;R. Hickox;S. Mutch;D. Croton;A. Ptak;M. Dipompeo
通讯作者:
M. Dipompeo
DOI:
10.1051/0004-6361/201527436
发表时间:
2016
期刊:
arXiv: Astrophysics of Galaxies
影响因子:
--
作者:
A. Bongiorno;A. Schulze;A. Merloni;G. Zamorani;O. Ilbert;F. Franca;Yingjie Peng;E. Piconcelli;V. Mainieri;J. Silverman;M. Brusa;M. Brusa;F. Fiore;M. Salvato;N. Scoville
通讯作者:
N. Scoville