Affiliation:
1. Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
2. Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), WPI, The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, Kashiwa, Chiba, Kashiwa 277-8583, Japan
Abstract
ABSTRACT
We study the properties of magnetic fields in the circumgalactic medium (CGM) of z < 1 galaxies by correlating Faraday rotation measures (RMs) of ∼1000 high-redshift radio sources with the foreground galaxy number density estimated from the DESI Legacy Imaging Surveys. This method enables us to extract signals of RMs contributed by intervening gas around multiple galaxies. Our results show that there is no detectable correlation between the distribution of RMs and the number of foreground galaxies, contrary to several previous results. Utilizing the non-detection signals, we estimate 3σ upper limits to the RMs from the CGM of $\sim \!20 \rm \ rad\, m^{-2}$ within 50 kpc and $\sim \!10 \rm \ rad \, m^{-2}$ at separations of 100 kpc. By adopting a column density distribution of ionized gas obtained from absorption-line measurements, we further estimate the strengths of coherent magnetic fields parallel to the line of sight of $\lt \rm 2 \ \mu G$ in the CGM. We show that the estimated upper limits of RMs and magnetic field strengths are sufficient to constrain outputs of recent galaxy magnetohydrodynamic simulations. Finally, we discuss possible causes for the inconsistency between our results and previous works.
Funder
National Science Foundation
Laura and John Arnold Foundation
U.S. Department of Energy
Science and Technology Facilities Council
Higher Education Funding Council for England
University of Illinois at Urbana-Champaign
University of Chicago
Ohio State University
Financiadora de Estudos e Projetos
Deutsche Forschungsgemeinschaft
Argonne National Laboratory
University of California
University of Cambridge
University College London
University of Edinburgh
Eidgenössische Technische Hochschule Zürich
Lawrence Berkeley National Laboratory
University of Michigan
University of Nottingham
University of Pennsylvania
University of Portsmouth
SLAC National Accelerator Laboratory
Stanford University
University of Sussex
Chinese Academy of Sciences
Ministry of Finance
National Natural Science Foundation of China
National Aeronautics and Space Administration
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
23 articles.
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