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Physical Models for the Clustering of Obscured and Unobscured Quasars
Journal article   Open access

Physical Models for the Clustering of Obscured and Unobscured Quasars

Kelly E. Whalen, Ryan C. Hickox, Michael A. DiPompeo, Gordon T. Richards and Adam D. Myers
The Astrophysical journal, v 888(2)
10 Jan 2020
DOI: https://doi.org/10.3847/1538-4357/ab5d31
url
https://doi.org/10.3847/1538-4357/ab5d31View
SubmittedOpen Access (License Unspecified),  Open

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
Clustering measurements of obscured and unobscured quasars show that obscured quasars reside in more massive dark matter halos than their unobscured counterparts. These results are inconsistent with simple unified (torus) scenarios but might be explained by models in which the distribution of obscuring material depends on Eddington ratio or galaxy stellar mass. We test these possibilities by constructing simple physical models to compare to observed active galactic nucleus populations. We find that previously observed relationships between obscuration and Eddington ratio or stellar mass are not sufficient to reproduce the observed quasar clustering results for obscured and unobscured populations, respectively) while maintaining the observed fraction of obscured quasars (30%-65%). This work suggests that evolutionary models, in which obscuration evolves on the typical timescale for black hole growth, are necessary to understand the observed clustering of mid-IR-selected quasars.

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Domestic collaboration
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Astronomy & Astrophysics
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