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With only two masks of Keck\/MOSFIRE near-IR spectroscopy in both <jats:italic>H<\/jats:italic> (\u223c1.47\u20131.81 <jats:italic>\u03bc<\/jats:italic>m) and <jats:italic>K<\/jats:italic> (\u223c1.92\u20132.40 <jats:italic>\u03bc<\/jats:italic>m) bands (\u223c1.5 hr each), we confirm 35 unique protocluster members with at least two emission lines detected with S\/N &gt; 3. Combined with 12 extra members from the zCOSMOS-deep spectroscopic survey (47 in total), we estimate a mean redshift and a line-of-sight velocity dispersion of <jats:italic>z<\/jats:italic>\n                  <jats:sub>mean<\/jats:sub>\u00a0=\u00a02.23224\u00a0\u00b1\u00a00.00101 and <jats:italic>\u03c3<\/jats:italic>\n                  <jats:sub>los<\/jats:sub>\u00a0=\u00a0645\u00a0\u00b1\u00a069 km s<jats:sup>\u22121<\/jats:sup> for this protocluster, respectively. Assuming virialization and spherical symmetry for the system, we estimate a total mass of <jats:italic>M<\/jats:italic>\n                  <jats:sub>vir<\/jats:sub>\u00a0\u223c\u00a0(1\u20132) \u00d710<jats:sup>14<\/jats:sup>\n                  <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub> for the structure. We evaluate a number density enhancement of <jats:italic>\u03b4<\/jats:italic>\n                  <jats:sub>\n                     <jats:italic>g<\/jats:italic>\n                  <\/jats:sub>\u00a0\u223c\u00a07 for this system and we argue that the structure is likely not fully virialized at <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a02.2. However, in a spherical collapse model, <jats:italic>\u03b4<\/jats:italic>\n                  <jats:sub>\n                     <jats:italic>g<\/jats:italic>\n                  <\/jats:sub> is expected to grow to a linear matter enhancement of \u223c1.9 by <jats:italic>z<\/jats:italic>\u00a0=\u00a00, exceeding the collapse threshold of 1.69, and leading to a fully collapsed and virialized Coma-type structure with a total mass of <jats:italic>M<\/jats:italic>\n                  <jats:sub>dyn<\/jats:sub>(<jats:italic>z<\/jats:italic>\u00a0=\u00a00)\u00a0\u223c\u00a09.2\u00a0\u00d7\u00a010<jats:sup>14<\/jats:sup>\n                  <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub> by now. This observationally efficient confirmation suggests that large narrowband emission-line galaxy surveys, when combined with ancillary photometric data, can be used to effectively trace the large-scale structure and protoclusters at a time when they are mostly dominated by star-forming galaxies.<\/jats:p>","DOI":"10.3847\/1538-4357\/ab75c3","type":"journal-article","created":{"date-parts":[[2020,3,19]],"date-time":"2020-03-19T18:16:24Z","timestamp":1584641784000},"page":"8","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":40,"title":["Spectroscopic Confirmation of a Coma Cluster Progenitor at z\u00a0\u223c\u00a02.2"],"prefix":"10.3847","volume":"892","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4919-9017","authenticated-orcid":false,"given":"Behnam","family":"Darvish","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0438-3323","authenticated-orcid":false,"given":"Nick 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