A M ≳ 3 shock in `El Gordo' cluster and the origin of the radio relic

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.

Volume

463

Issue

2

Start page

1534

Uri

http://hdl.handle.net/20.500.12386/24767

Url

https://academic.oup.com/mnras/article/463/2/1534/2892606

Issn Identifier

0035-8711

Ads BibCode

2016MNRAS.463.1534B

Rights

open.access

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Monthly Notices of the Royal Astronomical Society 2016 Botteon.pdf

Description

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Size

2.07 MB

Format

Adobe PDF

Checksum (MD5)

241fb41bbade6e24397878adf61d5ea6

Name

1607.04641.pdf

Description

postprint

Size

1.93 MB

Format

Adobe PDF

Checksum (MD5)

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A M ≳ 3 shock in `El Gordo' cluster and the origin of the radio relic

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