The role of scatter and satellites in shaping the large-scale clustering of X-ray AGN as a function of host galaxy stellar mass

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Viitanen , A , Allevato , V , Finoguenov , A , Shankar , F & Marsden , C 2021 , ' The role of scatter and satellites in shaping the large-scale clustering of X-ray AGN as a function of host galaxy stellar mass ' , Monthly Notices of the Royal Astronomical Society , vol. 507 , no. 4 , pp. 6148-6160 . https://doi.org/10.1093/mnras/stab2538

Title: The role of scatter and satellites in shaping the large-scale clustering of X-ray AGN as a function of host galaxy stellar mass
Author: Viitanen, A.; Allevato, V.; Finoguenov, A.; Shankar, F.; Marsden, C.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2021-11
Language: eng
Number of pages: 13
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/335512
Abstract: The co-evolution between central supermassive black holes (BHs), their host galaxies, and dark matter haloes is still a matter of intense debate. Present theoretical models suffer from large uncertainties and degeneracies, for example, between the fraction of accreting sources and their characteristic accretion rate. In recent work, we showed that active galactic nuclei (AGNs) clustering represents a powerful tool to break degeneracies when analysed in terms of mean BH mass, and that AGN bias at fixed stellar mass is largely independent of most of the input parameters, such as the AGN duty cycle and the mean scaling between BH mass and host galaxy stellar mass. In this paper, we take advantage of our improved semi-empirical methodology and recent clustering data derived from large AGN samples at z similar to 1.2, demonstrate that the AGN bias as a function of host galaxy stellar mass is a crucial diagnostic of the BH-galaxy connection, and is highly dependent on the scatter around the BH mass-galaxy mass scaling relation and on the relative fraction of satellite and central active BHs. Current data at z similar to 1.2 favour relatively high values of AGN in satellites, pointing to a major role of disc instabilities in triggering AGN, unless a high minimum host halo mass is assumed. The data are not decisive on the magnitude/covariance of the BH-galaxy scatter at z similar to 1.2 and intermediate host masses M-star less than or similar to 10(11) M-star. However, future surveys like Euclid/LSST will be pivotal in shedding light on the BH-galaxy co-evolution.
Subject: galaxies: active
galaxies: evolution
galaxies: haloes
SUPERMASSIVE BLACK-HOLES
ACTIVE GALACTIC NUCLEI
WIDE-FIELD SURVEY
DUTY CYCLES
EDDINGTON RATIOS
COSMOS FIELD
FUNDAMENTAL RELATION
CROSS-CORRELATION
HALO MASS
EVOLUTION
115 Astronomy, Space science
114 Physical sciences
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