We report on ALMA observations of D1, a system at z ∼ 6.15 with stellar mass M* ∼ 107M⊙ containing globular cluster (GC) precursors, strongly magnified by the galaxy cluster MACS 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 dataset, 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[CII] = (2.9 ± 1.4) 106L⊙, one of the lowest values ever detected at high redshift. This study offers a first insight on previously uncharted regions of the L[CII] − 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 [CII] 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 3 − σ upper limit values as low as ∼ a few 104 M⊙, consistent with the values measured in local metal-poor galaxies.
Calura, F., Vanzella, E., Carniani, S., Gilli, R., Rosati, P., Meneghetti, M., et al. (2021). Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 500(3 (1 January 2021)), 3083-3094 [10.1093/mnras/staa3185].
Citazione: | Calura, F., Vanzella, E., Carniani, S., Gilli, R., Rosati, P., Meneghetti, M., et al. (2021). Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 500(3 (1 January 2021)), 3083-3094 [10.1093/mnras/staa3185]. | |
Tipo: | Articolo in rivista - Articolo scientifico | |
Carattere della pubblicazione: | Scientifica | |
Presenza di un coautore afferente ad Istituzioni straniere: | Si | |
Titolo: | Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA | |
Autori: | Calura, F; Vanzella, E; Carniani, S; Gilli, R; Rosati, P; Meneghetti, M; Paladino, R; Decarli, R; Brusa, M; Lupi, A; D'Amato, Q; Bergamini, P; B Caminha, G | |
Autori: | ||
Data di pubblicazione: | 2021 | |
Lingua: | English | |
Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1093/mnras/staa3185 | |
Appare nelle tipologie: | 01 - Articolo su rivista |