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The implied Ly<jats:italic>\u03b1<\/jats:italic> equivalent widths can be in excess of 100\u2013200 \u00c5, challenging existing models of normal star formation and indicating extremely young ages, small stellar masses, and a very low amount of metal enrichment. We use JWST\/NIRSpec\u2019s microshutter array to follow up 45 of these galaxies (11 hr in G235M\/F170LP and 7 hr in G395M\/F290LP), as well as 45 lower-equivalent width Ly<jats:italic>\u03b1<\/jats:italic> emitters. Our spectroscopy covers the range 1.7\u22125.1 micron in order to target strong optical emission lines: H<jats:italic>\u03b1<\/jats:italic>, [O <jats:sc>iii<\/jats:sc>], H<jats:italic>\u03b2<\/jats:italic>, and [N II]. Individual measurements as well as stacks reveal line ratios consistent with a metal-poor nature (2%\u221240% <jats:italic>Z<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>, depending on the calibration). The galaxies with the highest equivalent widths of Ly<jats:italic>\u03b1<\/jats:italic>, in excess of 90 \u00c5, have lower [N II]\/H<jats:italic>\u03b1<\/jats:italic> (1.9<jats:italic>\u03c3<\/jats:italic>) and [O <jats:sc>iii<\/jats:sc>]\/H<jats:italic>\u03b2<\/jats:italic> (2.2<jats:italic>\u03c3<\/jats:italic>) ratios than those with lower equivalent widths, implying lower gas-phase metallicities at a combined significance of 2.4<jats:italic>\u03c3<\/jats:italic>. This implies a selection based on Ly<jats:italic>\u03b1<\/jats:italic> equivalent width is an efficient technique for identifying younger, less chemically enriched systems.<\/jats:p>","DOI":"10.3847\/1538-4357\/acf12b","type":"journal-article","created":{"date-parts":[[2023,10,3]],"date-time":"2023-10-03T15:47:42Z","timestamp":1696348062000},"page":"11","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":34,"title":["JWST\/NIRSpec Measurements of Extremely Low Metallicities in High Equivalent Width Ly\u03b1 Emitters"],"prefix":"10.3847","volume":"956","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0695-4414","authenticated-orcid":true,"given":"Michael V.","family":"Maseda","sequence":"first","affiliation":[]},{"given":"Zach","family":"Lewis","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2871-127X","authenticated-orcid":true,"given":"Jorryt","family":"Matthee","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7054-4332","authenticated-orcid":true,"given":"Joseph F.","family":"Hennawi","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3952-8588","authenticated-orcid":true,"given":"Leindert","family":"Boogaard","sequence":"additional","affiliation":[]},{"given":"Anna","family":"Feltre","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2804-0648","authenticated-orcid":true,"given":"Themiya","family":"Nanayakkara","sequence":"additional","affiliation":[]},{"given":"Roland","family":"Bacon","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3306-1606","authenticated-orcid":true,"given":"Amy","family":"Barger","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\/0000-0002-8871-3026","authenticated-orcid":true,"given":"Marijn","family":"Franx","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0898-4038","authenticated-orcid":true,"given":"Takuya","family":"Hashimoto","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4268-0393","authenticated-orcid":true,"given":"Hanae","family":"Inami","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3801-434X","authenticated-orcid":true,"given":"Haruka","family":"Kusakabe","sequence":"additional","affiliation":[]},{"given":"Floriane","family":"Leclercq","sequence":"additional","affiliation":[]},{"given":"Lucie","family":"Rowland","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1282-7454","authenticated-orcid":true,"given":"Anthony J.","family":"Taylor","sequence":"additional","affiliation":[]},{"given":"Christy","family":"Tremonti","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6746-9936","authenticated-orcid":true,"given":"Tanya","family":"Urrutia","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0668-5560","authenticated-orcid":true,"given":"Joop","family":"Schaye","sequence":"additional","affiliation":[]},{"given":"Charlotte","family":"Simmonds","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5121-1260","authenticated-orcid":false,"given":"Elo\u00efse","family":"Vitte","sequence":"additional","affiliation":[]}],"member":"2208","published-online":{"date-parts":[[2023,10,3]]},"reference":[{"key":"apjacf12bbib1","doi-asserted-by":"publisher","first-page":"167","DOI":"10.3847\/1538-4357\/ac7c74","volume":"935","author":"Astropy Collaboration","year":"2022","journal-title":"ApJ"},{"key":"apjacf12bbib2","doi-asserted-by":"publisher","first-page":"773508","DOI":"10.1117\/12.856027","volume":"7735","author":"Bacon","year":"2010","journal-title":"Proc. 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