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Previous studies have suggested that it may host an extreme ionizing source. Here, we present deep integral field spectroscopy of CR7 with VLT\/Multi Unit Spectroscopic Explorer (MUSE). We measure extended emission with a similar halo scale length as typical LAEs at z \u2248 5. CR7\u2019s Ly\u2009\u03b1 halo is clearly elongated along the direction connecting the multiple components, likely tracing the underlying gas distribution. The Ly\u2009\u03b1 emission originates almost exclusively from the brightest UV component, but we also identify a faint kinematically distinct Ly\u2009\u03b1 emitting region nearby a fainter component. Combined with new near-infrared data, the MUSE data show that the rest-frame Ly\u2009\u03b1 equivalent width (EW) is \u2248100\u2009\u00c5. This is a factor 4 higher than the EW measured in low-redshift analogues with carefully matched Ly\u2009\u03b1 profiles (and thus arguably H\u2009i column density), but this EW can plausibly be explained by star formation. Alternative scenarios requiring active galactic nucleus (AGN) powering are also disfavoured by the narrower and steeper Ly\u2009\u03b1 spectrum and much smaller IR to UV ratio compared to obscured AGN in other Ly\u2009\u03b1 blobs. CR7\u2019s Ly\u2009\u03b1 emission, while extremely luminous, resembles the emission in more common LAEs at lower redshifts very well and is likely powered by a young metal-poor starburst.<\/jats:p>","DOI":"10.1093\/mnras\/staa2550","type":"journal-article","created":{"date-parts":[[2020,8,21]],"date-time":"2020-08-21T12:10:03Z","timestamp":1598011803000},"page":"3043-3059","source":"Crossref","is-referenced-by-count":18,"title":["The nature of CR7 revealed with MUSE: a young starburst powering extended Ly\u2009\u03b1 emission at z\u00a0= 6.6"],"prefix":"10.1093","volume":"498","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2871-127X","authenticated-orcid":false,"given":"Jorryt","family":"Matthee","sequence":"first","affiliation":[{"name":"Department of Physics, ETH Z\u00fcrich, Wolfgang-Pauli-Strasse 27, CH-8093 Z\u00fcrich, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0736-7879","authenticated-orcid":false,"given":"Gabriele","family":"Pezzulli","sequence":"additional","affiliation":[{"name":"Department of Physics, ETH Z\u00fcrich, Wolfgang-Pauli-Strasse 27, CH-8093 Z\u00fcrich, Switzerland"}]},{"given":"Ruari","family":"Mackenzie","sequence":"additional","affiliation":[{"name":"Department of Physics, ETH Z\u00fcrich, Wolfgang-Pauli-Strasse 27, CH-8093 Z\u00fcrich, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5804-1428","authenticated-orcid":false,"given":"Sebastiano","family":"Cantalupo","sequence":"additional","affiliation":[{"name":"Department of Physics, ETH Z\u00fcrich, Wolfgang-Pauli-Strasse 27, CH-8093 Z\u00fcrich, Switzerland"}]},{"given":"Haruka","family":"Kusakabe","sequence":"additional","affiliation":[{"name":"Observatoire de Gen\u00e8ve, Universit\u00e9 de Gen\u00e8ve, 51 chemin de P\u00e9gase, CH-1290 Versoix, Switzerland"}]},{"given":"Floriane","family":"Leclercq","sequence":"additional","affiliation":[{"name":"Observatoire de Gen\u00e8ve, Universit\u00e9 de Gen\u00e8ve, 51 chemin de P\u00e9gase, CH-1290 Versoix, Switzerland"}]},{"given":"David","family":"Sobral","sequence":"additional","affiliation":[{"name":"Department of Physics, Lancaster University, Lancaster LA1 4YB, UK"}]},{"given":"Johan","family":"Richard","sequence":"additional","affiliation":[{"name":"Univ. 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