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http://hdl.handle.net/20.500.12386/24547
Titolo: | First ALMA Detection of a Galaxy Cluster Merger Shock | Autori: | Basu, K. Sommer, M. Erler, J. Eckert, D. VAZZA, FRANCO Magnelli, B. Bertoldi, F. TOZZI, Paolo |
Data pubblicazione: | 2016 | Rivista: | THE MESSENGER | Numero: | 166 | Da pagina:: | 53 | Abstract: | We report on the first ALMA measurement of a galaxy cluster merger shock, observed at the location of a radio relic in the famous El Gordo galaxy cluster at redshift z 0.9. Located at about half the current age of the Universe, this is also the most distant example of a directly measured astrophysical shock. ALMA Band 3 was utilised to measure the Sunyaev-Zel'dovich (SZ) effect signature that confirms a small-scale change in pressure as expected from the passage of a shock in the intracluster medium. The results support a previous radio-based estimate of the shock Mach number and display similarities, and also some mild tensions, with the X-ray based results. Most importantly, these results show the potential of ALMA to detect galaxy cluster shocks, observations that will advance our knowledge of cluster formation, non-thermal particle acceleration and amplification of magnetic fields across the entire observable Universe where such relic shocks can be found. | URI: | http://hdl.handle.net/20.500.12386/24547 | URL: | http://www.eso.org/sci/publications/messenger/ | ISSN: | 0722-6691 | Bibcode ADS: | 2016Msngr.166...53B | Fulltext: | open |
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