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2017MNRAS.472.4587H - Mon. Not. R. Astron. Soc., 472, 4587-4597 (2017/December-3)

Dust masses of z > 5 galaxies from SED fitting and ALMA upper limits.


Abstract (from CDS):

We aim at constraining the dust mass in high-z (z >= 5) galaxies using the upper limits obtained by Atacama Large Millimetre/submillimetre Array (ALMA) in combination with the rest-frame UV-optical spectral energy distributions (SEDs). For SED fitting, because of degeneracy between dust extinction and stellar age, we focus on two extremes: continuous star formation (Model A) and instantaneous star formation (Model B). We apply these models to Himiko (as a representative UV-bright object) and a composite SED of z > 5 Lyman break galaxies (LBGs). For Himiko, Model A requires a significant dust extinction, which leads to a high dust temperature >70 K for consistency with the ALMA upper limit. This high dust temperature puts a strong upper limit on the total dust mass Md <= 2 x 106 M, and the dust mass produced per supernova (SN) md,SN <= 0.1 M. Such a low m_d, SN_ suggests significant loss of dust by reverse shock destruction or outflow, and implies that SNe are not the dominant source of dust at high z. Model B allows Md ∼ 2 x 107 M and md,SN ∼ 0.3 M. We could distinguish between Models A and B if we observe Himiko at wavelength < 1.2 mm by ALMA. For the LBG sample, we obtain Md <= 2 x 106 M for a typical LBG at z > 5, but this only puts an upper limit for md,SN as ∼2 M. This clarifies the importance of observing UV-bright objects (like Himiko) to constrain the dust production by SNe.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): dust, extinction - galaxies: evolution - galaxies: high-redshift - galaxies: ISM - galaxies: star formation - submillimetre: galaxies - submillimetre: galaxies

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