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However, the origin of the LAHs is still a subject of debate. The spatially resolved analysis of Ly<jats:italic>\u03b1<\/jats:italic> profiles provides an important diagnostic. We analyse the average spatial extent and spectral variation of the circumgalactic LAHs by stacking a sample of 155 Ly<jats:italic>\u03b1<\/jats:italic> emitters (LAEs) at redshifts of 3\u2004&lt;\u2004<jats:italic>z<\/jats:italic>\u2004&lt;\u20044 in the MUSE Extremely Deep Field. Our analysis reveals that, with respect to the Ly<jats:italic>\u03b1<\/jats:italic> line of the target LAE, the peak of the Ly<jats:italic>\u03b1<\/jats:italic> line at large distances becomes increasingly more blueshifted up to a projected distance of 60 kpc (\u22483\u00d7 virial radius), with a velocity offset of \u2248250 km\/s. This trend is evident in both the mean and median stacks, suggesting that it is a general property of our LAE sample, which typically has a Ly<jats:italic>\u03b1<\/jats:italic> luminosity of \u224810<jats:sup>41.1<\/jats:sup>\u2006erg\u2006s<jats:sup>\u22121<\/jats:sup>. However, due to the absence of systemic redshift data, it remains unclear whether the Ly<jats:italic>\u03b1<\/jats:italic> line peak at large projected distances is less redshifted compared to the inner regions or truly blueshifted with respect to the systemic velocity. We explore various scenarios to explain the large-scale kinematics of the Ly<jats:italic>\u03b1<\/jats:italic> line.<\/jats:p>","DOI":"10.1051\/0004-6361\/202347958","type":"journal-article","created":{"date-parts":[[2024,9,19]],"date-time":"2024-09-19T18:43:27Z","timestamp":1726771407000},"page":"A66","source":"Crossref","is-referenced-by-count":11,"title":["Spatially resolved spectroscopic analysis of Ly<i>\u03b1<\/i> haloes"],"prefix":"10.1051","volume":"691","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6137-0422","authenticated-orcid":false,"given":"Yucheng","family":"Guo","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6148-0915","authenticated-orcid":false,"given":"Roland","family":"Bacon","sequence":"additional","affiliation":[]},{"given":"Lutz","family":"Wisotzki","sequence":"additional","affiliation":[]},{"given":"Thibault","family":"Garel","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1609-7911","authenticated-orcid":false,"given":"J\u00e9r\u00e9my","family":"Blaizot","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0668-5560","authenticated-orcid":false,"given":"Joop","family":"Schaye","sequence":"additional","affiliation":[]},{"given":"Jorryt","family":"Matthee","sequence":"additional","affiliation":[]},{"given":"Floriane","family":"Leclercq","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3952-8588","authenticated-orcid":false,"given":"Leindert","family":"Boogaard","sequence":"additional","affiliation":[]},{"given":"Johan","family":"Richard","sequence":"additional","affiliation":[]},{"given":"Anne","family":"Verhamme","sequence":"additional","affiliation":[]},{"given":"Jarle","family":"Brinchmann","sequence":"additional","affiliation":[]},{"given":"L\u00e9o","family":"Michel-Dansac","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3801-434X","authenticated-orcid":false,"given":"Haruka","family":"Kusakabe","sequence":"additional","affiliation":[]}],"member":"250","published-online":{"date-parts":[[2024,10,29]]},"reference":[{"key":"R1","doi-asserted-by":"crossref","first-page":"863","DOI":"10.1046\/j.1365-8711.2003.06353.x","volume":"340","author":"Ahn","year":"2003","journal-title":"MNRAS"},{"key":"R2","first-page":"773508","volume":"7735","author":"Bacon","year":"2010","journal-title":"SPIE Conf. 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