The ALPINE-ALMA [CII] survey: Dust emission effective radius up to 3 kpc in the early Universe

Author:

Pozzi F.ORCID,Calura F.ORCID,D’Amato Q.,Gavarente M.,Bethermin M.ORCID,Boquien M.ORCID,Casasola V.ORCID,Cimatti A.,Cochrane R.,Dessauges-Zavadsky M.ORCID,Enia A.ORCID,Esposito F.,Faisst A. L.ORCID,Gilli R.ORCID,Ginolfi M.,Gobat R.,Gruppioni C.ORCID,Hayward C. C.,Ibar E.ORCID,Koekemoer A. M.ORCID,Lemaux B. C.ORCID,Magdis G. E.,Molina J.,Romano M.,Talia M.ORCID,Vallini L.ORCID,Vergani D.,Zamorani G.

Abstract

Aims. Measurements of the size of dust continuum emission are an important tool for constraining the spatial extent of star formation, and hence the buildup of stellar mass. Compact dust emission has generally been observed at cosmic noon (z ∼ 2 − 3). However, at earlier epochs, toward the end of the reionization (z ∼ 4 − 6), only the sizes of a handful of infrared (IR) bright galaxies have been measured. In this work, we derive the dust emission sizes of main-sequence (MS) galaxies at z ∼ 5 from the ALPINE survey. Methods. We measured the dust effective radius, re, FIR, in the uv-plane in Band 7 of ALMA for seven ALPINE galaxies with resolved emission and we compared it with rest-frame ultraviolet (UV) and [CII]158 μm measurements. We studied the re, FIR − LIR scaling relation by considering our dust size measurements and all the data in the literature at z ∼ 4 − 6. Finally, we compared our size measurements with predictions from simulations. Results. The dust emission in the selected ALPINE galaxies is rather extended (re, FIR ∼ 1.5 − 3 kpc), similar to [CII]158 μm but a factor of ∼2 larger than the rest-frame UV emission. Putting together all the measurements at z ∼ 5, spanning two decades in luminosity from LIR ∼ 1011L to LIR ∼ 1013L, the data highlight a steeply increasing trend of the re, FIR − LIR relation at LIR < 1012L, followed by a downturn and a decreasing trend at brighter luminosities. Finally, simulations that extend up to the stellar masses of the ALPINE galaxies considered in the present work predict a subset of galaxies (∼25% at 1010M < M < 1011M) with sizes as large as those measured.

Funder

INAF

ANID FONDECYT

Villum Fonden

Danish National Research Foundation

National Research Agency

MIUR

Publisher

EDP Sciences

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. COLDSIM predictions of [C II] emission in primordial galaxies;Astronomy & Astrophysics;2024-09

2. Dust in high-redshift galaxies: reconciling UV attenuation and IR emission;Journal of Cosmology and Astroparticle Physics;2024-09-01

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