Sommovigo, L., Ferrara, A., Pallottini, A., Dayal, P., Bouwens, R. J., Smit, R., da Cunha, E., De Looze, I, Bowler, R. A. A., Hodge, J., Inami, H., Oesch, P., Endsley, R., Gonzalez, V, Schouws, S., Stark, D., Stefanon, M., Aravena, M., Graziani, L., Riechers, D., Schneider, R., van der Werf, P., Algera, H., Barrufet, L., Fudamoto, Y., Hygate, A. P. S., Labbe, I, Li, Y., Nanayakkara, T. and Topping, M. (2022). The ALMA REBELS Survey: cosmic dust temperature evolution out to z similar to 7. Mon. Not. Roy. Astron. Soc., 513 (3). S. 3122 - 3136. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

ALMA observations have revealed the presence of dust in the first generations of galaxies in the Universe. However, the dust temperature T-d remains mostly unconstrained due to the few available FIR continuum data at redshift z > 5. This introduces large uncertainties in several properties of high-z galaxies, namely their dust masses, infrared luminosities, and obscured fraction of star formation. Using a new method based on simultaneous [CII] 158-mu m line and underlying dust continuum measurements, we derive T-d in the continuum and [CII] detected z approximate to 7 galaxies in the ALMA Large Project REBELS sample. We find 39 < T-d < 58 K, and dust masses in the narrow range M-d = (0.9-3.6) x 10(7) M-circle dot. These results allow us to extend for the first time the reported T-d(z) relation into the Epoch of Reionization. We produce a new physical model that explains the increasing T-d(z) trend with the decrease of gas depletion time, t(d)(ep) = M-g/SFR, induced by the higher cosmological accretion rate at early times; this hypothesis yields T-d proportional to (1 + z)(0.4). The model also explains the observed T-d scatter at a fixed redshift. We find that dust is warmer in obscured sources, as a larger obscuration results in more efficient dust heating. For UV-transparent (obscured) galaxies, T-d only depends on the gas column density (metallicity), T-d proportional to N-H(1/6) (T-d proportional to Z(-1/6)). REBELS galaxies are on average relatively transparent, with effective gas column densities around N-H similar or equal to (0.03-1) x 10(21) cm(-2). We predict that other high-z galaxies (e.g. MACS0416-Y1, A2744-YD4), with estimated T-d >> 60 K, are significantly obscured, low-metallicity systems. In fact, T-d is higher in metal-poor systems due to their smaller dust content, which for fixed L-IR results in warmer temperatures.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Sommovigo, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ferrara, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pallottini, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dayal, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bouwens, R. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smit, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
da Cunha, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Looze, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bowler, R. A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hodge, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Inami, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oesch, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endsley, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gonzalez, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schouws, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stark, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stefanon, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aravena, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Graziani, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Riechers, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Werf, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Algera, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barrufet, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fudamoto, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hygate, A. P. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Labbe, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nanayakkara, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Topping, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-697333
DOI: 10.1093/mnras/stac302
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 513
Number: 3
Page Range: S. 3122 - 3136
Date: 2022
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ULTRA-DEEP FIELD; STAR-FORMING GALAXIES; SPECTRAL ENERGY-DISTRIBUTIONS; HUBBLE-SPACE-TELESCOPE; C II EMISSION; 158 MU-M; MASS-METALLICITY RELATION; DARK-MATTER HALOES; GREATER-THAN 6; INTERSTELLAR-MEDIUMMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69733

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