Radio relics in PSZ2 G096.88+24.18: a connection with pre-existing plasma
| Autor: | F. de Gasperin, A. Botteon, Kyle Finner, Marcus Brüggen, C. Jones, D. N. Hoang, William R. Forman, R. J. van Weeren, G. Brunetti, Alexander Jones, V. Cuciti, Timothy W. Shimwell, Ralph P. Kraft |
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| Rok vydání: | 2021 |
| Předmět: |
Shock wave
Brightness Large-Scale Structure of Universe Cosmology and Nongalactic Astrophysics (astro-ph.CO) Radio galaxy Radiation Mechanisms Astrophysics::High Energy Astrophysical Phenomena Population FOS: Physical sciences Synchrotron radiation Individual Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Clusters Radio relics 0103 physical sciences education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster High Energy Astrophysical Phenomena (astro-ph.HE) Physics education.field_of_study 010308 nuclear & particles physics PSZ2 G096.88+24.18 Astronomy and Astrophysics LOFAR Galaxies Non-Thermal Space and Planetary Science Intracluster Medium Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 505(4), 4762-4774 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stab1443 |
| Popis: | Giant radio relics are arc-like structures of diffuse, non-thermal synchrotron radiation that trace shock waves induced by galaxy cluster mergers. The particle (re-)acceleration mechanism producing such radio relics is unclear. One major open question is whether relics can be formed directly from a population of thermal seed electrons, or if pre-existing relativistic seed electrons are required. In some cases AGN can provide such a population of sub-GeV electrons. However, it is unclear how common this connection is. In this paper we present LOFAR 140 MHz and VLA L-band radio observations, as well as Chandra data of PSZ2 G096.88+24.18, a merging galaxy cluster system hosting a pair of radio relics. A large patch of diffuse emission connects a bright radio galaxy with one of the relics, likely affecting the properties of the relic. We find that the most plausible explanation for the connection is that the merger shock wave has passed over an AGN lobe. The shock passing over this seed population of electrons has led to an increased brightness in the relic only in the region filled with seed electrons. Comment: 20 pages, 9 figures, 4 tables, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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