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http://hdl.handle.net/20.500.12386/24765
Titolo: | A multiwavelength view of the galaxy cluster Abell 523 and its peculiar diffuse radio source | Autori: | Girardi, M. Boschin, W. GASTALDELLO, FABIO Giovannini, G. GOVONI, FEDERICA MURGIA, MATTEO Barrena, R. ETTORI, STEFANO Trasatti, M. VACCA, VALENTINA |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 456 | Fascicolo: | 3 | Da pagina:: | 2829 | Abstract: | We study the structure of the galaxy cluster Abell 523 (A523) at z = 0.104 using new spectroscopic data for 132 galaxies acquired at the Telescopio Nazionale Galileo, new photometric data from the Isaac Newton Telescope, and X-ray and radio data from the Chandra and Very Large Array archives. We estimate the velocity dispersion of the galaxy population, σ _V=949_{-60}^{+80} km s<SUP>-1</SUP>, and the X-ray temperature of the hot intracluster medium, kT = 5.3 ± 0.3 keV. We infer that A523 is a massive system: M<SUB>200</SUB> ∼ 7-9 × 10<SUP>14</SUP> M<SUB>☉</SUB>. The analysis of the optical data confirms the presence of two subclusters, 0.75 Mpc apart, tracing the SSW-NNE direction and dominated by the two brightest cluster galaxies (BCG1 and BCG2). The X-ray surface brightness is strongly elongated towards the NNE direction, and its peak is clearly offset from both the brightest cluster galaxies (BCGs). We confirm the presence of a 1.3 Mpc large radio halo, elongated in the ESE-WNW direction and perpendicular to the optical/X-ray elongation. We detect a significant radio/X-ray offset and radio polarization, two features which might be the result of a magnetic field energy spread on large spatial scales. A523 is found consistent with most scaling relations followed by clusters hosting radio haloes, but quite peculiar in the P<SUB>radio</SUB>-L<SUB>X</SUB> relation: it is underluminous in the X-rays or overluminous in radio. A523 can be described as a binary head-on merger caught after a collision along the SSW-NNE direction. However, minor optical and radio features suggest a more complex cluster structure, with A523 forming at the crossing of two filaments along the SSW-NNE and ESE-WNW directions. | URI: | http://hdl.handle.net/20.500.12386/24765 | URL: | https://academic.oup.com/mnras/article/456/3/2829/1096985 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv2827 | Bibcode ADS: | 2016MNRAS.456.2829G | Fulltext: | open |
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