X-ray detected AGN in SDSS dwarf galaxies
X-ray detected AGN in SDSS dwarf galaxies
复制标题
X射线在SDSS矮星系中检测到活动星系核
DOI:
10.1093/mnras/staa040
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发表时间:
2020
影响因子:
4.8
通讯作者:
Birchall K
中科院分区:
文献类型:
--
作者:
Birchall K
In this work we present a robust quantification of X-ray selected AGN in local (z≤ 0.25) dwarf galaxies (). We define a parent sample of 4331 dwarf galaxies found within the footprint of both the MPA-JHU galaxy catalogue (based on SDSS DR8) and 3XMM DR7, performed a careful review of the data to remove misidentifications and produced a sample of 61 dwarf galaxies that exhibit nuclear X-ray activity indicative of an AGN. We examine the optical emission line ratios of our X-ray selected sample and find that optical AGN diagnostics fail to identify 85 per cent of the sources. We then calculated the growth rates of the black holes powering our AGN in terms of their specific accretion rates (∝LX/M*, an approximate tracer of the Eddington ratio). Within our observed sample, we found a wide range of specific accretion rates. After correcting the observed sample for the varying sensitivity of 3XMM, we found further evidence for a wide range of X-ray luminosities and specific accretion rates, described by a power law. Using this corrected AGN sample we also define an AGN fraction describing their relative incidence within the parent sample. We found the AGN fraction increases with host galaxy mass (up to ≈6 per cent) for galaxies with X-ray luminosities betweenand, and by extrapolating the power law to higher luminosities, we found evidence to suggest the fraction of luminous AGN () is constant out toz≈ 0.7.
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DOI:
10.3847/2041-8213/aaf88d
发表时间:
2019
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
Cann J
通讯作者:
Cann J
DOI:
10.1046/j.1365-8711.2003.06291.x
发表时间:
2002-04
影响因子:
4.8
作者:
G. Kauffmann;T. Heckman;S. White;S. Charlot;C. Tremonti;J. Brinchmann;G. Bruzual;E. Peng;M. S
通讯作者:
G. Kauffmann;T. Heckman;S. White;S. Charlot;C. Tremonti;J. Brinchmann;G. Bruzual;E. Peng;M. S
影响因子:
4.9
作者:
Charlot, S;Fall, SM
通讯作者:
Fall, SM
DOI:
10.1088/0004-637x/742/1/13
发表时间:
2011-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. Bellovary;M. Volonteri;F. Governato;S. Shen;T. Quinn;J. Wadsley
通讯作者:
J. Bellovary;M. Volonteri;F. Governato;S. Shen;T. Quinn;J. Wadsley
影响因子:
4.8
作者:
L. Sartori;K. Schawinski;E. Treister;B. Trakhtenbrot;M. Koss;M. Shirazi;K. Oh
通讯作者:
K. Oh