We report on ALMA observations of D1, a system at z similar to 6.15 with stellar mass M-* similar to 10(7)M(circle dot) 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 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 4 sigma tentative detection of [CII] emission with intrinsic luminosity L-[C II] = (2.9 +/- 1.4) 10(6) L-1, 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 similar to 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 3 sigma upper limit values as low as similar to a few 10(4)M(circle dot), consistent with the values measured in local metal-poor galaxies.
Constraints on the [C ii] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA / F. Calura, E. Vanzella, S. Carniani, R. Gilli, P. Rosati, M. Meneghetti, R. Paladino, R. Decarli, M. Brusa, A. Lupi, Q. D’Amato, P. Bergamini, G.B. Caminha. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 500:3(2021), pp. 3083-3094. [10.1093/mnras/staa3185]
Constraints on the [C ii] luminosity of a proto-globular cluster at z ∼ 6 obtained with ALMA
P. BergaminiPenultimo
;
2021
Abstract
We report on ALMA observations of D1, a system at z similar to 6.15 with stellar mass M-* similar to 10(7)M(circle dot) 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 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 4 sigma tentative detection of [CII] emission with intrinsic luminosity L-[C II] = (2.9 +/- 1.4) 10(6) L-1, 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 similar to 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 3 sigma upper limit values as low as similar to a few 10(4)M(circle dot), consistent with the values measured in local metal-poor galaxies.File | Dimensione | Formato | |
---|---|---|---|
2010.07302.pdf
accesso aperto
Tipologia:
Pre-print (manoscritto inviato all'editore)
Dimensione
1.43 MB
Formato
Adobe PDF
|
1.43 MB | Adobe PDF | Visualizza/Apri |
staa3185.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
2.59 MB
Formato
Adobe PDF
|
2.59 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.