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http://hdl.handle.net/20.500.12386/32104
Titolo: | Constraints on the [C II] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA | Autori: | CALURA, Francesco VANZELLA, Eros Carniani, Stefano GILLI, Roberto Rosati, Piero MENEGHETTI, MASSIMO Paladino, Rosita DECARLI, ROBERTO Brusa, Marcella LUPI, ALESSANDRO D'AMATO, QUIRINO BERGAMINI, PIETRO Caminha, Gabriel B. |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 500 | Fascicolo: | 3 | Da pagina:: | 3083 | 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. | URI: | http://hdl.handle.net/20.500.12386/32104 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85098561415 https://academic.oup.com/mnras/article/500/3/3083/5925357?login=false |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa3185 | Fulltext: | open |
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