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Specifically, we detect objects via Ly<jats:italic>\u03b1<\/jats:italic> emission at 2.9\u00a0&lt;\u00a0<jats:italic>z<\/jats:italic>\u00a0&lt;\u00a06.7 without individual continuum counterparts in areas covered by the deepest optical\/near-infrared imaging taken by the <jats:italic>Hubble Space Telescope<\/jats:italic>, the Hubble Ultra Deep Field. In total, we find 102 such objects in 9 square arcminutes at these redshifts. Detailed stacking analyses confirm the Ly<jats:italic>\u03b1<\/jats:italic> emission as well as the 1216 \u00c5 breaks and faint ultraviolet continua (<jats:italic>M<\/jats:italic>\n                  <jats:sub>UV<\/jats:sub>\u00a0\u223c\u00a0\u221215). This makes them the faintest spectroscopically confirmed objects at these redshifts, similar to the sources believed to reionize the universe. A simple model for the expected fraction of detected\/undetected Ly<jats:italic>\u03b1<\/jats:italic> emitters as a function of luminosity is consistent with these objects being the high-equivalent width tail of the normal Ly<jats:italic>\u03b1<\/jats:italic>-emitter population at these redshifts.<\/jats:p>","DOI":"10.3847\/2041-8213\/aade4b","type":"journal-article","created":{"date-parts":[[2018,9,14]],"date-time":"2018-09-14T17:14:38Z","timestamp":1536945278000},"page":"L1","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":39,"title":["MUSE Spectroscopic Identifications of Ultra-faint Emission Line Galaxies with M<sub>UV<\/sub>\u00a0\u223c\u00a0\u221215<sup>*<\/sup>"],"prefix":"10.3847","volume":"865","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0695-4414","authenticated-orcid":false,"given":"Michael V.","family":"Maseda","sequence":"first","affiliation":[]},{"given":"Roland","family":"Bacon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8871-3026","authenticated-orcid":false,"given":"Marijn","family":"Franx","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4359-8797","authenticated-orcid":false,"given":"Jarle","family":"Brinchmann","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0668-5560","authenticated-orcid":false,"given":"Joop","family":"Schaye","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3952-8588","authenticated-orcid":false,"given":"Leindert A.","family":"Boogaard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0068-9920","authenticated-orcid":false,"given":"Nicolas","family":"Bouch\u00e9","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4989-2471","authenticated-orcid":false,"given":"Rychard J.","family":"Bouwens","sequence":"additional","affiliation":[]},{"given":"Sebastiano","family":"Cantalupo","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0275-938X","authenticated-orcid":false,"given":"Thierry","family":"Contini","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0898-4038","authenticated-orcid":false,"given":"Takuya","family":"Hashimoto","sequence":"additional","affiliation":[]},{"given":"Hanae","family":"Inami","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8559-6565","authenticated-orcid":false,"given":"Raffaella A.","family":"Marino","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3938-8762","authenticated-orcid":false,"given":"Sowgat","family":"Muzahid","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2804-0648","authenticated-orcid":false,"given":"Themiya","family":"Nanayakkara","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5492-1049","authenticated-orcid":false,"given":"Johan","family":"Richard","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3418-7251","authenticated-orcid":false,"given":"Kasper B.","family":"Schmidt","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2201-1865","authenticated-orcid":false,"given":"Anne","family":"Verhamme","sequence":"additional","affiliation":[]},{"given":"Lutz","family":"Wisotzki","sequence":"additional","affiliation":[]}],"member":"2208","published-online":{"date-parts":[[2018,9,14]]},"reference":[{"key":"apjlaade4bbib1","doi-asserted-by":"publisher","DOI":"10.1117\/12.856027","volume":"7735","author":"Bacon","year":"2010","journal-title":"Proc. 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