Reconstructing the Observed Ionizing Photon Production Efficiency at Z ~2 Using Stellar Population Models

dc.contributor.authorNanayakkara, Themiya
dc.contributor.authorBrinchmann, Jarle
dc.contributor.authorGlazebrook, Karl
dc.contributor.authorBouwens, Rychard John
dc.contributor.authorKewley, Lisa
dc.contributor.authorTran, Kim-Vy
dc.contributor.authorCowley, Michael
dc.contributor.authorFisher, Deanne B
dc.contributor.authorKacprzak, Glenn
dc.contributor.authorLabbe, Ivo
dc.contributor.authorStraatman, Caroline
dc.date.accessioned2022-06-29T00:28:47Z
dc.date.available2022-06-29T00:28:47Z
dc.date.issued2020
dc.date.updated2021-08-01T08:21:33Z
dc.description.abstractThe ionizing photon production efficiency, ξion, is a critical parameter that provides a number of physical constraints to the nature of the early Universe, including the contribution of galaxies to the timely completion of the reionization of the Universe. Here we use KECK/MOSFIRE and ZFOURGE multi-band photometric data to explore the ξion of a population of galaxies at z∼2 with log10(M∗/M⊙)∼9.0−11.5. Our 130 \Halpha\ detections show a median log10(ξion[Hz/erg]) of 24.8±0.5 when dust corrected using a Calzetti et al. (2000) dust prescription. Our values are typical of mass/magnitude selected ξion values observed in the z∼2 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 log10(ξion[Hz/erg])≲25.0 have low Hα equivalent widths (EW) and redder colors compared to our z∼2 observed sample. We find that introducing star-bursts to the SFHs resolve the tension with the models, however, due to the rapid time evolution of ξion, Hα EWs, and rest-frame optical colors, our Monte Carlo simulations of star-bursts show that random distribution of star-bursts 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 photonsen_AU
dc.description.sponsorshipT.N., J.B., and R.B. acknowledge the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) top grant TOP1.16.057. J.B. acknowledges support by Fundação para a Ciência e a Tecnologia (FCT) through national funds (UID/FIS/04434/2013) and Investigador FCT contract IF/01654/2014/CP1215/CT0003, and by FEDER through COMPETE2020 (POCI-01-0145-FEDER-007672). G.G.K. acknowledges the support of the Australian Research Council through the Discovery Project DP170103470. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0004-637Xen_AU
dc.identifier.urihttp://hdl.handle.net/1885/268559
dc.language.isoen_AUen_AU
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/6401..."The Published Version can be archived in any website" from SHERPA/RoMEO site (as at 29/06/2022).en_AU
dc.publisherIOP Publishingen_AU
dc.relationhttp://purl.org/au-research/grants/arc/CE170100013en_AU
dc.rights© 2020. The American Astronomical Societyen_AU
dc.sourceThe Astrophysical Journalen_AU
dc.titleReconstructing the Observed Ionizing Photon Production Efficiency at Z ~2 Using Stellar Population Modelsen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue2en_AU
local.bibliographicCitation.lastpage14en_AU
local.bibliographicCitation.startpage1en_AU
local.contributor.affiliationNanayakkara, Themiya, Leiden Universityen_AU
local.contributor.affiliationBrinchmann, Jarle, Universidade do Portoen_AU
local.contributor.affiliationGlazebrook, Karl, Swinburne University of Technologyen_AU
local.contributor.affiliationBouwens, Rychard John, Leiden Universityen_AU
local.contributor.affiliationKewley, Lisa, College of Science, ANUen_AU
local.contributor.affiliationTran, Kim-Vy, University of New South Walesen_AU
local.contributor.affiliationCowley, Michael, University of Southern Queenslanden_AU
local.contributor.affiliationFisher, Deanne B, Swinburne University of Technologyen_AU
local.contributor.affiliationKacprzak, Glenn, Swinburne University of Technologyen_AU
local.contributor.affiliationLabbe, Ivo, Swinburne University of Technologyen_AU
local.contributor.affiliationStraatman, Caroline, Universiteit Genten_AU
local.contributor.authoremailu9415124@anu.edu.auen_AU
local.contributor.authoruidKewley, Lisa, u9415124en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor510109 - Stellar astronomy and planetary systemsen_AU
local.identifier.absfor510103 - Cosmology and extragalactic astronomyen_AU
local.identifier.ariespublicationa383154xPUB11297en_AU
local.identifier.citationvolume889en_AU
local.identifier.doi10.3847/1538-4357/ab65eben_AU
local.identifier.scopusID2-s2.0-85081300335
local.identifier.uidSubmittedBya383154en_AU
local.publisher.urlhttp://iopscience.iop.org/0004-637Xen_AU
local.type.statusPublished Versionen_AU

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