Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111
Abstract
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.
- Authors:
-
[1];
[3];
[4];
- 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
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1513036
- Alternate Identifier(s):
- OSTI ID: 1546967
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 486 Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; magnetic fields; galaxies: active; galaxies: clusters: individual: MRC 0116 + 111; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
Citation Formats
Mernier, F., Werner, N., Bagchi, J., Simionescu, A., Böhringer, H., Allen, S. W., and Jacob, J. Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz1228.
Mernier, F., Werner, N., Bagchi, J., Simionescu, A., Böhringer, H., Allen, S. W., & Jacob, J. Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111. United Kingdom. https://doi.org/10.1093/mnras/stz1228
Mernier, F., Werner, N., Bagchi, J., Simionescu, A., Böhringer, H., Allen, S. W., and Jacob, J. Thu .
"Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111". United Kingdom. https://doi.org/10.1093/mnras/stz1228.
@article{osti_1513036,
title = {Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116 + 111},
author = {Mernier, F. and Werner, N. and Bagchi, J. and Simionescu, A. and Böhringer, H. and Allen, S. W. and Jacob, J.},
abstractNote = {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.},
doi = {10.1093/mnras/stz1228},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 486,
place = {United Kingdom},
year = {Thu May 02 00:00:00 EDT 2019},
month = {Thu May 02 00:00:00 EDT 2019}
}
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