Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA
Date Issued
2021
Author(s)
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Carniani, Stefano
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Brusa, Marcella
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Caminha, Gabriel B.
Abstract
We report on ALMA observations of D1, a system at z ∼ 6.15 with stellar mass M∼ 107M⊙ containing globular cluster (GC) precursors, stronglymagnified by the galaxy clusterMACS J0416.1-2403. Since the discovery of GC progenitors at high redshift, ours is the first attempt to probe directly the physical properties of their neutral gas through infrared observations. A careful analysis of our data set, performed with a suitable procedure designed to identify faint narrow lines and which can test various possible values for the unknown linewidth value, allowed us to identify a 4σ tentative detection of [CII] emission with intrinsic luminosity L[C II] = (2.9 ± 1.4) 106 L⊙, one of the lowest values ever detected at high redshift. This study offers a first insight on previously uncharted regions of the L[C II]-SFR relation. Despite large uncertainties affecting our measure of the star formation rate, if taken at face value our estimate lies more than ∼1 dex below the values observed in local and high redshift systems. Our weak detection indicates a deficiency of [C II] emission, possibly ascribed to various explanations, such as a low-density gas and/or a strong radiation field caused by intense stellar feedback, and a low metal content. From the non-detection in the continuum, we derive constraints on the dust mass, with 3σ upper limit values as low as ∼ a few 104 M⊙, consistent with the values measured in local metal-poor galaxies.
Volume
500
Issue
3
Start page
3083
Issn Identifier
0035-8711
Rights
open.access
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