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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/20.500.12386/29261
Title: Growth and disruption in the Lyra complex
Authors: CLAVICO, SARA 
DE GRANDI, Sabrina 
GHIZZARDI, SIMONA 
ROSSETTI, MARIACHIARA 
MOLENDI, SILVANO 
GASTALDELLO, FABIO 
Girardi, M.
Boschin, W.
Botteon, A.
CASSANO, Rossella 
Brüggen, M.
BRUNETTI, GIANFRANCO 
Dallacasa, Daniele 
Eckert, D.
ETTORI, STEFANO 
GASPARI, MASSIMO 
Sereno, Mauro 
Shimwell, T.
van Weeren, R. J.
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 632
First Page: A27
Abstract: Nearby clusters of galaxies, z<0.1, are cosmic structures still under formation. Understanding the thermodynamic properties of merging clusters can provide crucial information on how they grow in the local universe. A detailed study of the intra-cluster medium (ICM) properties of un-relaxed systems is essential to understand the fate of in-falling structures and, more generally, the virialization process. We analyzed a mosaic of XMM-Newton observations (240 ks) of the Lyra system (z=0.067) that shows a complex dynamical state. We find the main cluster RXC J1825.3+3026 to be in a late merger phase, whereas its companion CIZA J1824.1+3029 is a relaxed cool-core cluster. We estimate a mass ratio of ~1:2 for the pair. No diffuse X-ray emission is found in the region between them, indicating that these clusters are in a pre-merger phase. We found evidence of a galaxy group infalling on RXC J1825.3+3026 in an advanced state of disruption. The Southern Galaxy, one of the brightest galaxies in the Lyra complex, was very likely at the center of the infalling group. This galaxy has a gaseous corona indicating that it was able to retain some of its gas after the ram-pressure stripping of the intra-group medium. In this scenario the diffuse emission excess observed southwest of RXC J1825.3+3026 could be due to gas once belonging to the group and/or to cluster ICM dislocated by the passage of the group. Finally, we identified three high-velocity galaxies aligned between RXC J1825.3+3026 and the SG, two of these showing evidence of gas stripped from them during infall. We estimate them to be currently falling onto the main cluster at an infall velocity of ~ 3000 km/s. Our study of the Lyra complex provides important clues about the processes presiding over the virialization of massive clusters in the local Universe.
URI: http://hdl.handle.net/20.500.12386/29261
URL: https://www.aanda.org/articles/aa/abs/2019/12/aa36467-19/aa36467-19.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201936467
Bibcode ADS: 2019A&A...632A..27C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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