{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360021391867556224.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.3847/1538-4357/acf12b"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/1538-4357/acf12b"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/1538-4357/acf12b/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"JWST/NIRSpec Measurements of Extremely Low Metallicities in High Equivalent Width Lyα Emitters"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>Deep Very Large Telescope/MUSE optical integral field spectroscopy has recently revealed an abundant population of ultra-faint galaxies (<jats:italic>M</jats:italic>\n                  <jats:sub>UV</jats:sub> ≈ −15; 0.01 <jats:italic>L</jats:italic>\n                  <jats:sub>⋆</jats:sub>) at <jats:italic>z</jats:italic> = 2.9−6.7 due to their strong Ly<jats:italic>α</jats:italic> emission with no detectable continuum. The implied Ly<jats:italic>α</jats:italic> equivalent widths can be in excess of 100–200 Å, 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’s 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>α</jats:italic> emitters. Our spectroscopy covers the range 1.7−5.1 micron in order to target strong optical emission lines: H<jats:italic>α</jats:italic>, [O <jats:sc>iii</jats:sc>], H<jats:italic>β</jats:italic>, and [N II]. Individual measurements as well as stacks reveal line ratios consistent with a metal-poor nature (2%−40% <jats:italic>Z</jats:italic>\n                  <jats:sub>⊙</jats:sub>, depending on the calibration). The galaxies with the highest equivalent widths of Ly<jats:italic>α</jats:italic>, in excess of 90 Å, have lower [N II]/H<jats:italic>α</jats:italic> (1.9<jats:italic>σ</jats:italic>) and [O <jats:sc>iii</jats:sc>]/H<jats:italic>β</jats:italic> (2.2<jats:italic>σ</jats:italic>) ratios than those with lower equivalent widths, implying lower gas-phase metallicities at a combined significance of 2.4<jats:italic>σ</jats:italic>. This implies a selection based on Ly<jats:italic>α</jats:italic> equivalent width is an efficient technique for identifying younger, less chemically enriched systems.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021391867556254","@type":"Researcher","foaf:name":[{"@value":"Michael V. Maseda"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556374","@type":"Researcher","foaf:name":[{"@value":"Zach Lewis"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556480","@type":"Researcher","foaf:name":[{"@value":"Jorryt Matthee"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556369","@type":"Researcher","foaf:name":[{"@value":"Joseph F. Hennawi"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556250","@type":"Researcher","foaf:name":[{"@value":"Leindert Boogaard"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556249","@type":"Researcher","foaf:name":[{"@value":"Anna Feltre"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556224","@type":"Researcher","foaf:name":[{"@value":"Themiya Nanayakkara"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556377","@type":"Researcher","foaf:name":[{"@value":"Roland Bacon"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556382","@type":"Researcher","foaf:name":[{"@value":"Amy Barger"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556389","@type":"Researcher","foaf:name":[{"@value":"Jarle Brinchmann"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556365","@type":"Researcher","foaf:name":[{"@value":"Marijn Franx"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556353","@type":"Researcher","foaf:name":[{"@value":"Takuya Hashimoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1420282801184548736","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20841943"},{"@type":"NRID","@value":"1000020841943"},{"@type":"NRID","@value":"9000415346263"},{"@type":"NRID","@value":"9000408809600"},{"@type":"NRID","@value":"9000408809637"},{"@type":"NRID","@value":"9000408810940"},{"@type":"NRID","@value":"9000408811231"},{"@type":"NRID","@value":"9000014141070"},{"@type":"NRID","@value":"9000415346163"},{"@type":"NRID","@value":"9000408811316"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/hanae.inami"}],"foaf:name":[{"@value":"Hanae Inami"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556481","@type":"Researcher","foaf:name":[{"@value":"Haruka Kusakabe"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556385","@type":"Researcher","foaf:name":[{"@value":"Floriane Leclercq"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556358","@type":"Researcher","foaf:name":[{"@value":"Lucie Rowland"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391867556359","@type":"Researcher","foaf:name":[{"@value":"Anthony J. 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