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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24765
Title: A multiwavelength view of the galaxy cluster Abell 523 and its peculiar diffuse radio source
Authors: Girardi, M.
Boschin, W.
GASTALDELLO, FABIO 
Giovannini, G. 
GOVONI, FEDERICA 
MURGIA, MATTEO 
Barrena, R.
ETTORI, STEFANO 
Trasatti, M.
VACCA, VALENTINA 
Issue Date: 2016
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 456
Issue: 3
First Page: 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
Appears in Collections:1.01 Articoli in rivista

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Monthly Notices of the Royal Astronomical Society 2016 Girardi.pdfPDF editoriale5.58 MBAdobe PDFView/Open
1510.05951.pdfpostprint1.29 MBAdobe PDFView/Open
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