{"status":"public","title":"Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters","quality_controlled":"1","date_created":"2022-07-07T10:46:41Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Published Version","oa":1,"scopus_import":"1","publisher":"Oxford University Press","issue":"4","date_published":"2020-04-01T00:00:00Z","extern":"1","publication_status":"published","abstract":[{"text":"While low-luminosity galaxies dominate number counts at all redshifts, their contribution to cosmic reionization is poorly understood due to a lack of knowledge of their physical properties. We isolate a sample of 35 z ≈ 4–5 continuum-faint Lyman-α emitters from deep VLT/MUSE spectroscopy and directly measure their H α emission using stacked Spitzer/IRAC Ch. 1 photometry. Based on Hubble Space Telescope imaging, we determine that the average UV continuum magnitude is fainter than −16 (≈ 0.01 L⋆), implying a median Lyman-α equivalent width of 259 Å. By combining the H α measurement with the UV magnitude, we determine the ionizing photon production efficiency, ξion, a first for such faint galaxies. The measurement of log10 (ξion [Hz erg−1]) = 26.28 (⁠+0.28−0.40⁠) is in excess of literature measurements of both continuum- and emission line-selected samples, implying a more efficient production of ionizing photons in these lower luminosity, Lyman-α-selected systems. We conclude that this elevated efficiency can be explained by stellar populations with metallicities between 4 × 10−4 and 0.008, with light-weighted ages less than 3 Myr.","lang":"eng"}],"main_file_link":[{"url":"https://doi.org/10.1093/mnras/staa622","open_access":"1"}],"day":"01","type":"journal_article","date_updated":"2022-08-18T11:23:27Z","month":"04","article_processing_charge":"No","acknowledgement":"We would like to thank the anonymous referee for a thoughtful report and suggestions that have improved this manuscript. We are also grateful to everyone involved in the Spitzer Space Telescope mission and everyone at the Spitzer Science Center: we are truly fortunate to have been able to use data from this facility. J. B. acknowledges support by FCT/MCTES through national funds by this grant UID/FIS/04434/2019 and through the Investigador FCT contract no. IF/01654/2014/CP1215/CT0003. S. C. gratefully acknowledges support from Swiss National Science Foundation grant PP00P2 163824. We would also like to thank Mauro Stefanon for his assistance with de-blending the IRAC photometry, Pieter van Dokkum for a number of useful suggestions, and Daniel Schaerer for information regarding the stellar population models. This study is based on observations made with ESO telescopes at the La Silla Paranal Observatory under programs IDs 094.A-2089(B), 095.A0010(A), 096.A-0045(A), and 096.A-0045(B).","keyword":["Space and Planetary Science","Astronomy and Astrophysics","Galaxies: evolution","Galaxies: high-redshift","Galaxies: ISM"],"volume":493,"intvolume":"       493","year":"2020","article_type":"original","citation":{"ista":"Maseda MV, Bacon R, Lam D, Matthee JJ, Brinchmann J, Schaye J, Labbe I, Schmidt KB, Boogaard L, Bouwens R, Cantalupo S, Franx M, Hashimoto T, Inami H, Kusakabe H, Mahler G, Nanayakkara T, Richard J, Wisotzki L. 2020. Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters. Monthly Notices of the Royal Astronomical Society. 493(4), 5120–5130.","chicago":"Maseda, Michael V, Roland Bacon, Daniel Lam, Jorryt J Matthee, Jarle Brinchmann, Joop Schaye, Ivo Labbe, et al. “Elevated Ionizing Photon Production Efficiency in Faint High-Equivalent-Width Lyman-α Emitters.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2020. <a href=\"https://doi.org/10.1093/mnras/staa622\">https://doi.org/10.1093/mnras/staa622</a>.","apa":"Maseda, M. V., Bacon, R., Lam, D., Matthee, J. J., Brinchmann, J., Schaye, J., … Wisotzki, L. (2020). Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/staa622\">https://doi.org/10.1093/mnras/staa622</a>","ama":"Maseda MV, Bacon R, Lam D, et al. Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters. <i>Monthly Notices of the Royal Astronomical Society</i>. 2020;493(4):5120-5130. doi:<a href=\"https://doi.org/10.1093/mnras/staa622\">10.1093/mnras/staa622</a>","short":"M.V. Maseda, R. Bacon, D. Lam, J.J. Matthee, J. Brinchmann, J. Schaye, I. Labbe, K.B. Schmidt, L. Boogaard, R. Bouwens, S. Cantalupo, M. Franx, T. Hashimoto, H. Inami, H. Kusakabe, G. Mahler, T. Nanayakkara, J. Richard, L. Wisotzki, Monthly Notices of the Royal Astronomical Society 493 (2020) 5120–5130.","mla":"Maseda, Michael V., et al. “Elevated Ionizing Photon Production Efficiency in Faint High-Equivalent-Width Lyman-α Emitters.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 493, no. 4, Oxford University Press, 2020, pp. 5120–30, doi:<a href=\"https://doi.org/10.1093/mnras/staa622\">10.1093/mnras/staa622</a>.","ieee":"M. V. Maseda <i>et al.</i>, “Elevated ionizing photon production efficiency in faint high-equivalent-width Lyman-α emitters,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 493, no. 4. Oxford University Press, pp. 5120–5130, 2020."},"_id":"11531","language":[{"iso":"eng"}],"author":[{"first_name":"Michael V","last_name":"Maseda","full_name":"Maseda, Michael V"},{"full_name":"Bacon, Roland","last_name":"Bacon","first_name":"Roland"},{"first_name":"Daniel","last_name":"Lam","full_name":"Lam, Daniel"},{"id":"7439a258-f3c0-11ec-9501-9df22fe06720","full_name":"Matthee, Jorryt J","last_name":"Matthee","first_name":"Jorryt J","orcid":"0000-0003-2871-127X"},{"first_name":"Jarle","last_name":"Brinchmann","full_name":"Brinchmann, Jarle"},{"full_name":"Schaye, Joop","first_name":"Joop","last_name":"Schaye"},{"first_name":"Ivo","last_name":"Labbe","full_name":"Labbe, Ivo"},{"full_name":"Schmidt, Kasper B","first_name":"Kasper B","last_name":"Schmidt"},{"last_name":"Boogaard","first_name":"Leindert","full_name":"Boogaard, Leindert"},{"last_name":"Bouwens","first_name":"Rychard","full_name":"Bouwens, Rychard"},{"first_name":"Sebastiano","last_name":"Cantalupo","full_name":"Cantalupo, Sebastiano"},{"full_name":"Franx, Marijn","last_name":"Franx","first_name":"Marijn"},{"last_name":"Hashimoto","first_name":"Takuya","full_name":"Hashimoto, Takuya"},{"full_name":"Inami, Hanae","first_name":"Hanae","last_name":"Inami"},{"full_name":"Kusakabe, Haruka","first_name":"Haruka","last_name":"Kusakabe"},{"full_name":"Mahler, Guillaume","first_name":"Guillaume","last_name":"Mahler"},{"first_name":"Themiya","last_name":"Nanayakkara","full_name":"Nanayakkara, Themiya"},{"full_name":"Richard, Johan","last_name":"Richard","first_name":"Johan"},{"full_name":"Wisotzki, Lutz","last_name":"Wisotzki","first_name":"Lutz"}],"publication":"Monthly Notices of the Royal Astronomical Society","page":"5120-5130","doi":"10.1093/mnras/staa622","publication_identifier":{"issn":["0035-8711"],"eissn":["1365-2966"]},"external_id":{"arxiv":["2002.11117"]}}