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This large offset hampers follow-up surveys, galaxy pair statistics, and correlations with quasar absorption lines when only Ly\u2009\u03b1 is available. We propose diagnostics that can be used to recover the systemic redshift directly from the properties of the Ly\u2009\u03b1 line profile. We use spectroscopic observations of Ly\u2009\u03b1 emitters for which a precise measurement of the systemic redshift is available. Our sample contains 13 sources detected between z \u2248 3 and z \u2248 6 as part of various multi-unit spectroscopic explorer guaranteed time observations. We also include a compilation of spectroscopic Ly\u2009\u03b1 data from the literature spanning a wide redshift range (z \u2248 0\u20138). First, restricting our analysis to double-peaked Ly\u2009\u03b1 spectra, we find a tight correlation between the velocity offset of the red peak with respect to the systemic redshift, $V_{\\rm peak}^{\\rm red}$, and the separation of the peaks. Secondly, we find a correlation between $V_{\\rm peak}^{\\rm red}$ and the full width at half-maximum of the Ly\u2009\u03b1 line. Fitting formulas to estimate systemic redshifts of galaxies with an accuracy of \u2264100\u00a0km\u2009s\u22121, when only the Ly\u2009\u03b1 emission line is available, are given for the two methods.<\/jats:p>","DOI":"10.1093\/mnrasl\/sly058","type":"journal-article","created":{"date-parts":[[2018,4,6]],"date-time":"2018-04-06T05:48:28Z","timestamp":1522993708000},"page":"L60-L65","source":"Crossref","is-referenced-by-count":112,"title":["Recovering the systemic redshift of galaxies from their Lyman alpha line profile"],"prefix":"10.1093","volume":"478","author":[{"given":"A","family":"Verhamme","sequence":"first","affiliation":[{"name":"Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, F-69230 Saint-Genis-Laval, France"},{"name":"Observatoire de Gen\u00e8ve, Universit\u00e9 de Gen\u00e8ve, 51 Ch. des Maillettes, CH-1290 Versoix, Switzerland"}]},{"given":"T","family":"Garel","sequence":"additional","affiliation":[{"name":"Univ Lyon, Univ 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