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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/20.500.12386/25920
Title: A textbook example of ram-pressure stripping in the Hydra A/A780 cluster
Authors: DE GRANDI, Sabrina 
Eckert, D.
MOLENDI, SILVANO 
Girardi, M.
Roediger, E.
GASPARI, MASSIMO 
GASTALDELLO, FABIO 
GHIZZARDI, SIMONA 
NONINO, Mario 
ROSSETTI, MARIACHIARA 
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 592
First Page: A154
Abstract: In the current epoch, one of the main mechanisms driving the growth of galaxy clusters is the continuous accretion of group-scale halos. In this process, the ram pressure applied by the hot intracluster medium on the gas content of the infalling group is responsible for stripping the gas from its dark-matter halo, which gradually leads to the virialisation of the infalling gas in the potential well of the main cluster. Using deep wide-field observations of the poor cluster Hydra A/A780 with XMM-Newton and Suzaku, we report on the discovery of an infalling galaxy group 1.1 Mpc south of the cluster core. The presence of a substructure is confirmed by a dynamical study of the galaxies in this region. A wake of stripped gas is trailing behind the group over a projected scale of 760 kpc. The temperature of the gas along the wake is constant at kT ~ 1.3 keV, which is about a factor of two less than the temperature of the surrounding plasma. We observe a cold front pointing westwards compared to the peak of the group, which indicates that the group is currently not moving in the direction of the main cluster, but is moving along an almost circular orbit. The overall morphology of the group bears remarkable similarities with high-resolution numerical simulations of such structures, which greatly strengthens our understanding of the ram-pressure stripping process.
URI: http://hdl.handle.net/20.500.12386/25920
URL: https://www.aanda.org/articles/aa/abs/2016/08/aa26641-15/aa26641-15.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201526641
Bibcode ADS: 2016A&A...592A.154D
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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