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Selected by their Ly<jats:italic>\u03b1<\/jats:italic>\n                  <jats:italic>\u03bb<\/jats:italic>1216 emission and <jats:italic>H<\/jats:italic>\n                  <jats:sub>F160W<\/jats:sub>-band magnitude, the galaxies show an average <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mo stretchy=\"false\">\u3008<\/mml:mo>\n                        <mml:msubsup>\n                           <mml:mrow>\n                              <mml:mi>EW<\/mml:mi>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mi>Ly<\/mml:mi>\n                              <mml:mi>\u03b1<\/mml:mi>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mn>0<\/mml:mn>\n                           <\/mml:mrow>\n                        <\/mml:msubsup>\n                        <mml:mo stretchy=\"false\">\u3009<\/mml:mo>\n                        <mml:mo>\u2248<\/mml:mo>\n                        <mml:mn>20<\/mml:mn>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjac01d7ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> \u00c5, below the typical selection threshold for Ly\u03b1 emitters (<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:msubsup>\n                           <mml:mrow>\n                              <mml:mi>EW<\/mml:mi>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mi>Ly<\/mml:mi>\n                              <mml:mi>\u03b1<\/mml:mi>\n                           <\/mml:mrow>\n                           <mml:mrow>\n                              <mml:mn>0<\/mml:mn>\n                           <\/mml:mrow>\n                        <\/mml:msubsup>\n                        <mml:mo>&gt;<\/mml:mo>\n                        <mml:mn>25<\/mml:mn>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjac01d7ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> \u00c5), and a rest-frame UV spectrum similar to Lyman-break galaxies. We use rest-frame optical spectroscopy from KMOS and MOSFIRE, and the UV features observed with MUSE, to determine the systemic redshifts, which are offset from Ly<jats:italic>\u03b1<\/jats:italic> by \u3008\u0394<jats:italic>v<\/jats:italic>(Ly<jats:italic>\u03b1<\/jats:italic>)\u3009 = 346 km s<jats:sup>\u22121<\/jats:sup>, with a 100 to 600 km s<jats:sup>\u22121<\/jats:sup> range. Stacking <jats:sup>12<\/jats:sup>CO <jats:italic>J<\/jats:italic> = 4 \u2192 3 and [C <jats:sc>i<\/jats:sc>]<jats:sup>3<\/jats:sup>P<jats:sub>1<\/jats:sub> \u2192 <jats:sup>3<\/jats:sup>P<jats:sub>0<\/jats:sub> (and higher-<jats:italic>J<\/jats:italic> CO lines) from the ALMA Spectroscopic Survey of the HUDF, we determine 3<jats:italic>\u03c3<\/jats:italic> upper limits on the line luminosities of 4.0 \u00d7 10<jats:sup>8<\/jats:sup> K km s<jats:sup>\u22121<\/jats:sup>pc<jats:sup>2<\/jats:sup> and 5.6 \u00d7 10<jats:sup>8<\/jats:sup> K km s<jats:sup>\u22121<\/jats:sup>pc<jats:sup>2<\/jats:sup>, respectively (for a 300 km s<jats:sup>\u22121<\/jats:sup> line width). Stacking the 1.2 mm and 3 mm dust-continuum flux densities, we find a 3<jats:italic>\u03c3<\/jats:italic> upper limits of 9 <jats:italic>\u03bc<\/jats:italic>Jy and 1.2 <jats:italic>\u03bc<\/jats:italic>Jy, respectively. The inferred gas fractions, under the assumption of a \u201cGalactic\u201d CO-to-H<jats:sub>2<\/jats:sub> conversion factor and gas-to-dust ratio, are in tension with previously determined scaling relations. This implies a substantially higher <jats:italic>\u03b1<\/jats:italic>\n                  <jats:sub>CO<\/jats:sub> \u2265 10 and <jats:italic>\u03b4<\/jats:italic>\n                  <jats:sub>GDR<\/jats:sub> \u2265 1200, consistent with the subsolar metallicity estimated for these galaxies (<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mn>12<\/mml:mn>\n                        <mml:mo>+<\/mml:mo>\n                        <mml:mi>log<\/mml:mi>\n                        <mml:mo stretchy=\"false\">(<\/mml:mo>\n                        <mml:mi mathvariant=\"normal\">O<\/mml:mi>\n                        <mml:mrow>\n                           <mml:mo stretchy=\"true\">\/<\/mml:mo>\n                        <\/mml:mrow>\n                        <mml:mi mathvariant=\"normal\">H<\/mml:mi>\n                        <mml:mo stretchy=\"false\">)<\/mml:mo>\n                        <mml:mo>\u2248<\/mml:mo>\n                        <mml:mn>7.8<\/mml:mn>\n                        <mml:mo>\u00b1<\/mml:mo>\n                        <mml:mn>0.2<\/mml:mn>\n                     <\/mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjac01d7ieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>). The low metallicity of <jats:italic>z<\/jats:italic> \u2265 3 star-forming galaxies may thus make it very challenging to unveil their cold gas through CO or dust emission, warranting further exploration of alternative tracers, such as [C <jats:sc>ii<\/jats:sc>].<\/jats:p>","DOI":"10.3847\/1538-4357\/ac01d7","type":"journal-article","created":{"date-parts":[[2021,7,20]],"date-time":"2021-07-20T11:59:33Z","timestamp":1626782373000},"page":"12","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["Measuring the Average Molecular Gas Content of Star-forming Galaxies at z = 3\u20134"],"prefix":"10.3847","volume":"916","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3952-8588","authenticated-orcid":false,"given":"Leindert A.","family":"Boogaard","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4989-2471","authenticated-orcid":false,"given":"Rychard 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