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EnglishWe present an X-ray and radio study of the famous `El Gordo', a massive and distant (z = 0.87) galaxy cluster. In the deep (340 ks) Chandra observation, the cluster appears with an elongated and cometary morphology, a sign of its current merging state. The GMRT radio observations at 610 MHz confirm the presence of a radio halo, which remarkably overlaps the X-ray cluster emission and connects a couple of radio relics. We detect a strong shock (M≳3) in the NW periphery of the cluster, co-spatially located with the radio relic. This is the most distant (z = 0.87) and one of the strongest shocks detected in a galaxy cluster. This work supports the relic-shock connection and allows us to investigate the origin of these radio sources in an uncommon regime of M≳3. For this particular case we found that shock acceleration from the thermal pool is still a viable possibility.
| Titolo: | A $\mathcal M\gtrsim 3$ shock in ‘El Gordo’ cluster and the origin of the radio relic |
| Autore/i: | BOTTEON, ANDREA; GASTALDELLO, FABIO; BRUNETTI, GIANFRANCO; KALE, RUTA PRABHAKAR |
| Autore/i Unibo: | |
| Anno: | 2016 |
| Rivista: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1093/mnras/stw2089 |
| Abstract: | We present an X-ray and radio study of the famous `El Gordo', a massive and distant (z = 0.87) galaxy cluster. In the deep (340 ks) Chandra observation, the cluster appears with an elongated and cometary morphology, a sign of its current merging state. The GMRT radio observations at 610 MHz confirm the presence of a radio halo, which remarkably overlaps the X-ray cluster emission and connects a couple of radio relics. We detect a strong shock (M≳3) in the NW periphery of the cluster, co-spatially located with the radio relic. This is the most distant (z = 0.87) and one of the strongest shocks detected in a galaxy cluster. This work supports the relic-shock connection and allows us to investigate the origin of these radio sources in an uncommon regime of M≳3. For this particular case we found that shock acceleration from the thermal pool is still a viable possibility. |
| Data stato definitivo: | 2017-05-19T14:24:30Z |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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