The intrinsic X-ray luminosity distribution of an optically selected SDSS quasar population

被引:3
|
作者
Rankine, Amy L. [1 ]
Aird, James [1 ]
Ruiz, Angel [2 ]
Georgakakis, Antonis [2 ]
机构
[1] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Scotland
[2] Natl Observ Athens, Inst Astron & Astrophys, Athens 11532, Greece
基金
欧盟地平线“2020”;
关键词
methods: statistical; galaxies: active; galaxies: evolution; ultraviolet: galaxies; X-rays: galaxies; BROAD ABSORPTION-LINE; DATA RELEASE; XMM-NEWTON; EMISSION-LINE; BLACK-HOLES; C IV; AGN; EVOLUTION; CONTINUUM; CATALOG;
D O I
10.1093/mnras/stad3686
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In active galactic nuclei, the relationship between UV and X-ray luminosity is well studied (often characterised by alpha(ox)) but often with heterogeneous samples. We have parametrized the intrinsic distribution of X-ray luminosity, L-X, for the optically selected sample of SDSS quasars in the Stripe 82 and XXL fields across redshifts 0.5-3.5. We make use of the available XMM observations and a custom pipeline to produce Bayesian sensitivity curves that are used to derive the intrinsic X-ray distribution in a hierarchical Bayesian framework. We find that the X-ray luminosity distribution is well described by a Gaussian function in log10 L-X space with a mean that is dependent on the monochromatic 2500 angstrom UV luminosity, L-2500. We also observe some redshift dependence of the distribution. The mean of the L-X distribution increases with redshift while the width decreases. This weak but significant redshift dependence leads to L2500-LX and L2500-alpha ox relations that evolve with redshift, and we produce a redshift- and L-2500-dependent alpha ox equation. Neither black hole mass nor Eddington ratio appear to be potential drivers of the redshift evolution.
引用
收藏
页码:9004 / 9022
页数:19
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