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Balmer breaks in simulated galaxies at z > 6
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.ORCID iD: 0000-0003-1096-2636
Univ Calif Berkeley, Dept Astron, 501 Campbell Hall 3411, Berkeley, CA 94720 USA.
Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nagaito, Daito, Osaka 5748530, Japan;Waseda Univ, Fac Sci & Engn, Dept Phys, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan;Waseda Univ, Fac Sci & Engn, Res Inst Sci & Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 489, no 3, p. 3827-3835Article in journal (Refereed) Published
Abstract [en]

Photometric observations of the spectroscopically confirmed z approximate to 9.1 galaxy MACS1149-JD1 have indicated the presence of a prominent Balmer break in its spectral energy distribution, which may be interpreted as due to very large fluctuations in its past star formation activity. In this paper, we investigate to what extent contemporary simulations of high-redshift galaxies produce star formation rate variations sufficiently large to reproduce the observed Balmer break of MACS1149-JD1. We find that several independent galaxy simulations are unable to account for Balmer breaks of the inferred size, suggesting that MACS1149-JD1 either must be a very rare type of object or that our simulations are missing some key ingredient. We present predictions of spectroscopic Balmer break strength distributions for z approximate to 7-9 galaxies that may be tested through observations with the upcoming James Webb Space Telescope and also discuss the impact that various assumptions on dust reddening, Lyman continuum leakage, and deviations from a standard stellar initial mass function would have on the results.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 489, no 3, p. 3827-3835
Keywords [en]
galaxies: evolution, galaxies: high-redshift
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-396695DOI: 10.1093/mnras/stz2387ISI: 000489288600065OAI: oai:DiVA.org:uu-396695DiVA, id: diva2:1368912
Funder
Swedish National Space BoardAvailable from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved

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Binggeli, ChristianZackrisson, ErikVikaeus, Anton

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