Reconstructing the Observed Ionizing Photon Production Efficiency at z ∼ 2 Using Stellar Population Models
Article
Nanayakkara, Themiya, Brinchmann, Jarle, Glazebrook, Karl, Bouwens, Rychard, Kewley, Lisa, Tran, Kim-Vy, Cowley, Michael, Fisher, Deanne, Kacprzak, Glenn G., Labbe, Ivo and Straatman, Caroline. 2020. "Reconstructing the Observed Ionizing Photon Production Efficiency at z ∼ 2 Using Stellar Population Models." The Astrophysical Journal: an international review of astronomy and astronomical physics. 889 (2), pp. 1-14. https://doi.org/10.3847/1538-4357/ab65eb
| Article Title | Reconstructing the Observed Ionizing Photon Production Efficiency at z ∼ 2 Using Stellar Population Models |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Nanayakkara, Themiya, Brinchmann, Jarle, Glazebrook, Karl, Bouwens, Rychard, Kewley, Lisa, Tran, Kim-Vy, Cowley, Michael, Fisher, Deanne, Kacprzak, Glenn G., Labbe, Ivo and Straatman, Caroline |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 889 (2), pp. 1-14 |
| Article Number | 180 |
| Number of Pages | 14 |
| Year | 2020 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-637X |
| 1538-4357 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ab65eb |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ab65eb |
| Abstract | The ionizing photon production efficiency, ξ ion, 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 multiband photometric data to explore the ξ ion of a population of galaxies at z ∼ 2 with . Our 130 H detections show a median of 24.8 ± 0.5 when dust corrected using a Calzetti et al. dust prescription. Our values are typical of mass/magnitude selected ξ ion 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 have low H equivalent widths (EWs) and redder colors compared to our z ∼ 2 observed sample. We find that introducing starbursts to the SFHs resolve the tension with the models; however, due to the rapid time evolution of ξ ion, H 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. |
| Byline Affiliations | Leiden University, Netherlands |
| University of Porto, Portugal | |
| Swinburne University of Technology | |
| Australian National University | |
| ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
| University of New South Wales | |
| Texas A&M University, United States | |
| Centre for Astrophysics | |
| Queensland University of Technology | |
| University of Gent, Belgium |
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