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Here, we use KECK\/MOSFIRE and ZFOURGE multiband photometric data to explore the <jats:italic>\u03be<\/jats:italic>\n                  <jats:sub>ion<\/jats:sub> of a population of galaxies at <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a02 with <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjab65ebieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula>. Our 130 H<jats:italic>\u03b1<\/jats:italic> detections show a median <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjab65ebieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> of 24.8\u00a0\u00b1\u00a00.5 when dust corrected using a Calzetti et al. dust prescription. Our values are typical of mass\/magnitude selected <jats:italic>\u03be<\/jats:italic>\n                  <jats:sub>ion<\/jats:sub> values observed in the <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a02 universe. Using BPASSv2.2.1 and Starburst99 stellar population models with simple parametric star formation histories (SFH), we find that even with models that account for effects of stellar evolution with binaries\/stellar rotation, model galaxies at <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjab65ebieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> have low H<jats:italic>\u03b1<\/jats:italic> equivalent widths (EWs) and redder colors compared to our <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a02 observed sample. We find that introducing starbursts to the SFHs resolve the tension with the models; however, due to the rapid time evolution of <jats:italic>\u03be<\/jats:italic>\n                  <jats:sub>ion<\/jats:sub>, H<jats:italic>\u03b1<\/jats:italic> EWs, and rest-frame optical colors, our Monte Carlo simulations of starbursts show that random distributions of starbursts in evolutionary time of galaxies are unlikely to explain the observed distribution. Thus, either our observed sample is specially selected based on their past SFH, or stellar models require additional mechanisms to reproduce the observed high UV luminosity of galaxies for a given production rate of hydrogen ionizing photons.<\/jats:p>","DOI":"10.3847\/1538-4357\/ab65eb","type":"journal-article","created":{"date-parts":[[2020,2,5]],"date-time":"2020-02-05T15:13:28Z","timestamp":1580915608000},"page":"180","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":27,"title":["Reconstructing the Observed Ionizing Photon Production Efficiency at z \u223c 2 Using Stellar Population 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