Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 500, Issue 3, Pages 3083-3094Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3185
Keywords
gravitational lensing: strong; galaxies: high-redshift; galaxies: ISM; submillimetre: ISM
Categories
Funding
- grant PRIN MIUR [20173ML3WW 001]
- ERC [INTERSTELLAR H2020/740120]
- INAF mainstream [1.05.01.86.31]
- ASI through the agreement ASI-INAF [2018-29-HH.0]
- PRIN MIUR [2017WSCC32]
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A study of ALMA observations on the D1 system reveals a 4 sigma tentative detection of [CII] emission, shedding light on uncharted regions of the L[ C II]-SFR relation. The weak detection suggests a deficiency of [C II] emission, possibly due to low-density gas, strong radiation fields, and low metal content. Constraints on the dust mass were derived from the non-detection in the continuum, with 3 sigma upper limit values consistent with those in local metal-poor galaxies.
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.
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