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We present deep high-resolution (<jats:italic>R<\/jats:italic>\u2004=\u20045000) VLT\/X-shooter observations, along with an extensive collection of photometric data of COLA1, a proposed double peaked LAE at <jats:italic>z<\/jats:italic>\u2004=\u20046.6. We rule out the possibility that COLA1\u2019s emission line is an [O<jats:sc>II<\/jats:sc>] doublet at <jats:italic>z<\/jats:italic>\u2004=\u20041.475 on the basis of i) the asymmetric red line-profile and flux ratio of the peaks (blue\/red=0.31\u2005\u00b1\u20050.03) and ii) an unphysical [O<jats:sc>II<\/jats:sc>]\/H<jats:italic>\u03b1<\/jats:italic> ratio ([O<jats:sc>II<\/jats:sc>]\/H<jats:italic>\u03b1<\/jats:italic>\u2004&gt; \u200422). We show that COLA1\u2019s observed <jats:italic>B<\/jats:italic>-band flux is explained by a faint extended foreground LAE, for which we detect Ly<jats:italic>\u03b1<\/jats:italic> and [O<jats:sc>III<\/jats:sc>] at <jats:italic>z<\/jats:italic>\u2004=\u20042.142. We thus conclude that COLA1 is a real double-peaked LAE at <jats:italic>z<\/jats:italic>\u2004=\u20046.593, the first discovered at <jats:italic>z<\/jats:italic>\u2004&gt; \u20046. COLA1 is UV luminous (<jats:italic>M<\/jats:italic><jats:sub>1500<\/jats:sub>\u2004=\u2004\u221221.6\u2005\u00b1\u20050.3), has a high equivalent width (EW<jats:sub>0,Ly\u03b1<\/jats:sub> = 120<jats:sub>\u221240<\/jats:sub><jats:sup>+50<\/jats:sup> \u00c5) and very compact Ly<jats:italic>\u03b1<\/jats:italic> emission (r<jats:sub>50,Ly\u03b1<\/jats:sub> = 0.33<jats:sub>\u22120.04<\/jats:sub><jats:sup>+0.07<\/jats:sup> kpc). Relatively weak inferred H<jats:italic>\u03b2<\/jats:italic>+[O<jats:sc>III<\/jats:sc>] line-emission from <jats:italic>Spitzer<\/jats:italic>\/IRAC indicates an extremely low metallicity of <jats:italic>Z<\/jats:italic>\u2004&lt; \u20041\/20\u2006<jats:italic>Z<\/jats:italic><jats:sub>\u2299<\/jats:sub> or reduced strength of nebular lines due to high escape of ionising photons. The small Ly<jats:italic>\u03b1<\/jats:italic> peak separation of 220\u2005\u00b1\u200520 km s<jats:sup>\u22121<\/jats:sup> implies a low H<jats:sc>I<\/jats:sc> column density and an ionising photon escape fraction of \u224815\u2005\u2212\u200530%, providing the first direct evidence that such galaxies contribute actively to the reionisation of the Universe at <jats:italic>z<\/jats:italic>\u2004&gt; \u20046. Based on simple estimates, we find that COLA1 could have provided just enough photons to reionise its own \u22480.3 pMpc (2.3 cMpc) bubble, allowing the blue Ly<jats:italic>\u03b1<\/jats:italic> line to be observed. However, we also discuss alternative scenarios explaining the detected double peaked nature of COLA1. Our results show that future high-resolution observations of statistical samples of double peaked LAEs at <jats:italic>z<\/jats:italic>\u2004&gt; \u20045 are a promising probe of the occurrence of ionised regions around galaxies in the EoR.<\/jats:p>","DOI":"10.1051\/0004-6361\/201833528","type":"journal-article","created":{"date-parts":[[2018,9,7]],"date-time":"2018-09-07T08:19:08Z","timestamp":1536308348000},"page":"A136","source":"Crossref","is-referenced-by-count":81,"title":["Confirmation of double peaked Ly<i>\u03b1<\/i> emission at <i>z<\/i> = 6.593"],"prefix":"10.1051","volume":"619","author":[{"given":"Jorryt","family":"Matthee","sequence":"first","affiliation":[]},{"given":"David","family":"Sobral","sequence":"additional","affiliation":[]},{"given":"Max","family":"Gronke","sequence":"additional","affiliation":[]},{"given":"Ana","family":"Paulino-Afonso","sequence":"additional","affiliation":[]},{"given":"Mauro","family":"Stefanon","sequence":"additional","affiliation":[]},{"given":"Huub","family":"R\u00f6ttgering","sequence":"additional","affiliation":[]}],"member":"250","published-online":{"date-parts":[[2018,11,19]]},"reference":[{"key":"R1","doi-asserted-by":"crossref","first-page":"604","DOI":"10.1086\/321374","volume":"554","author":"Ahn","year":"2001","journal-title":"ApJ"},{"key":"R2","doi-asserted-by":"crossref","first-page":"A33","DOI":"10.1051\/0004-6361\/201322068","volume":"558","author":"Robitaille","year":"2013","journal-title":"A&A"},{"key":"R3","doi-asserted-by":"crossref","first-page":"11","DOI":"10.3847\/1538-4357\/837\/1\/11","volume":"837","author":"Bagley","year":"2017","journal-title":"ApJ"},{"key":"R4","doi-asserted-by":"crossref","first-page":"11","DOI":"10.3847\/0067-0049\/227\/1\/11","volume":"227","author":"Ba\u00f1ados","year":"2016","journal-title":"ApJS"},{"key":"R5","doi-asserted-by":"crossref","first-page":"473","DOI":"10.1038\/nature25180","volume":"553","author":"Ba\u00f1ados","year":"2018","journal-title":"Nature"},{"key":"R6","doi-asserted-by":"crossref","first-page":"3402","DOI":"10.1093\/mnras\/stu2646","volume":"447","author":"Becker","year":"2015","journal-title":"MNRAS"},{"key":"R7","unstructured":"Bertin E. 2010, Astrophysics Source Code Library [record ascl:1010.068]"},{"key":"R8","doi-asserted-by":"crossref","first-page":"60","DOI":"10.3847\/0004-6256\/152\/3\/60","volume":"152","author":"Bohlin","year":"2016","journal-title":"AJ"},{"key":"R9","first-page":"1055","volume":"479","author":"Bosman","year":"2018","journal-title":"MNRAS"},{"key":"R10","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1088\/0004-637X\/803\/1\/34","volume":"803","author":"Bouwens","year":"2015","journal-title":"ApJ"},{"key":"R11","doi-asserted-by":"crossref","first-page":"176","DOI":"10.3847\/0004-637X\/831\/2\/176","volume":"831","author":"Bouwens","year":"2016","journal-title":"ApJ"},{"key":"R12","unstructured":"Bouwens R. 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