Dr Elke Roediger E.Roediger@hull.ac.uk
Reader in Astrophysics
A textbook example of ram-pressure stripping in the Hydra A/A780 cluster
Roediger, E.; De Grandi, S.; Eckert, D.; Gaspari, M.; Gastaldello, F.; Ghizzardi, S.; Girardi, M.; Molendi, S.; Nonino, M.; Rossetti, M.
Authors
S. De Grandi
D. Eckert
M. Gaspari
F. Gastaldello
S. Ghizzardi
M. Girardi
S. Molendi
M. Nonino
M. Rossetti
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 virialization 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 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.
Citation
Roediger, E., De Grandi, S., Eckert, D., Gaspari, M., Gastaldello, F., Ghizzardi, S., …Rossetti, M. (2016). A textbook example of ram-pressure stripping in the Hydra A/A780 cluster. Astronomy and Astrophysics, 592, A154. https://doi.org/10.1051/0004-6361/201526641
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 18, 2016 |
Online Publication Date | Aug 24, 2016 |
Publication Date | Aug 1, 2016 |
Deposit Date | Mar 3, 2016 |
Publicly Available Date | Aug 1, 2016 |
Journal | Astronomy and astrophysics |
Print ISSN | 0004-6361 |
Electronic ISSN | 1432-0746 |
Publisher | EDP Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 592 |
Article Number | A154 |
Pages | A154 |
DOI | https://doi.org/10.1051/0004-6361/201526641 |
Keywords | X-rays : galaxies : clusters, Galaxies : clusters : general, Galaxies : groups : general, Galaxies : clusters : intracluster medium, Cosmology : large-scale structure |
Public URL | https://hull-repository.worktribe.com/output/412219 |
Publisher URL | https://www.aanda.org/articles/aa/abs/2016/08/aa26641-15/aa26641-15.html |
Additional Information | This is a description of an article accepted for publication in Astronomy and astrophysics. |
Files
12756 Roediger.pdf
(1.4 Mb)
PDF
You might also like
Resilience of sloshing cold fronts against subsequent minor mergers
(2022)
Journal Article
GASP XXIX-unwinding the arms of spiral galaxies via ram-pressure stripping
(2020)
Journal Article
The ram pressure stripped radio tails of galaxies in the Coma cluster
(2020)
Journal Article
Downloadable Citations
About Repository@Hull
Administrator e-mail: repository@hull.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search