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The absence of [C II] 158 μm emission in spectroscopically confirmed galaxies at z > 8

Laporte, N; Katz, H; Ellis, RS; Lagache, G; Bauer, FE; Boone, F; Inoue, AK; ... Tamura, Y; + view all (2019) The absence of [C II] 158 μm emission in spectroscopically confirmed galaxies at z > 8. Monthly Notices of the Royal Astronomical Society: Letters , 487 (1) L81-L85. 10.1093/mnrasl/slz094. Green open access

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Abstract

The scatter in the relationship between the strength of [C II] 158 μm emission and the star formation rate at high redshift has been the source of much recent interest. Although the relationship is well established locally, several intensely star-forming galaxies have been found whose [C II] 158 μm emission is either weak, absent, or spatially offset from the young stars. Here we present new ALMA data for the two most distant gravitationally lensed and spectroscopically confirmed galaxies, A2744_YD4 at z = 8.38 and MACS1149_JD1 at z = 9.11, both of which reveal intense [O III] 88 μm emission. In both cases we provide stringent upper limits on the presence of [C II] 158 μm with respect to [O III] 88 μm. We review possible explanations for this apparent redshift-dependent [C II] deficit in the context of our recent hydrodynamical simulations. Our results highlight the importance of using several emission line diagnostics with ALMA to investigate the nature of the interstellar medium in early galaxies.

Type: Article
Title: The absence of [C II] 158 μm emission in spectroscopically confirmed galaxies at z > 8
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnrasl/slz094
Publisher version: http://dx.doi.org/10.1093/mnrasl/slz094
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: galaxies: evolution, galaxies: high-redshift, galaxies: starburst, early universe, submillimetre: galaxies
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10076240
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