Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111

Mernier, F.; Werner, N.; Bagchi, J.; Simionescu, A.; Böhringer, H.; Allen, S. W.; Jacob, J.

doi:10.1093/mnras/stz1228

Title: Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111

Journal Article · Thu May 02 00:00:00 EDT 2019 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stz1228· OSTI ID:1513036

^[1]; Werner, N. ^[2];

^[3];

^[4]; Böhringer, H. ^[5]; Allen, S. W. ^[6]; Jacob, J. ^[7]

MTA-Eötvös University Lendület Hot Universe Research Group, Pázmány Péter sétány 1/A, Budapest 1117, Hungary, Institute of Physics, Eötvös University, Pázmány Péter sétány 1/A, Budapest 1117, Hungary, SRON Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
MTA-Eötvös University Lendület Hot Universe Research Group, Pázmány Péter sétány 1/A, Budapest 1117, Hungary, Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlářská 2, Brno CZ-611 37, Czech Republic, School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
SRON Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands, Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands, Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583, Japan
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Garching D-85748, Germany
Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
Newman College, Thodupuzha, Kerala 685584, India

ABSTRACT MRC 0116 + 111 is a nearby (z = 0.132) poor galaxy group, which was previously known for exhibiting a bright diffuse radio emission with no central point-like source, presumably related to a past activity of the active galactic nucleus (AGN) in its central cD galaxy. Here, we present an X-ray observation (∼30 ks of cleaned XMM–Newton/EPIC exposure) of this system, allowing us for the first time a detailed comparison between the thermal and non-thermal components of its intragroup medium (IGrM). Remarkably, we find that the radio-to-X-ray luminosity ratio is among the highest ever observed for a diffuse extragalactic source so far, while the extent of the observed radio emission is about three times larger than its observed soft X-ray emission. Although powerful AGN activity may have disturbed the dynamics of the thermal IGrM in the form of turbulence, possibly re-energizing part of the relativistic electron population, the gas properties lie within the LX–T scaling relation established previously for other groups. The upper limit we find for the non-thermal inverse-Compton X-ray emission translates into a surprisingly high lower limit for the volume-averaged magnetic field of the group (≥4.3 $$\mu$$G). Finally, we discuss some interesting properties of a distant (z ≃ 0.525) galaxy cluster serendipitously discovered in our EPIC field of view.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1513036

Alternate ID(s):: OSTI ID: 1546967

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 486 Journal Issue: 4; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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magnetic fields
galaxies: active
galaxies: clusters: individual: MRC 0116 + 111
galaxies: clusters: intracluster medium
X-rays: galaxies: clusters

Title: Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111

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