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Fluorescent C II* 1335A emission spectroscopically resolved in a galaxy at z = 5.754

Bosman, SEI; Laporte, N; Ellis, RS; Ouchi, M; Harikane, Y; (2019) Fluorescent C II* 1335A emission spectroscopically resolved in a galaxy at z = 5.754. Monthly Notices of the Royal Astronomical Society: Letters , 487 (1) 10.1093/mnrasl/slz081. Green open access

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Abstract

We report the discovery of the first spectroscopically resolved C II /C II* 1334, 1335A doublet in the Lyman-break galaxy J0215-0555 at z = 5.754. The separation of the resonant and fluorescent emission channels was possible thanks to the large redshift of the source and long integration time, as well as the small velocity width of the feature, 0.6 +- 0.2A. We model this emission and find that at least two components are required to reproduce the combination of morphologies of C II* emission, C II absorption and emission, and Lyman-alpha emission from the object. We suggest that the close alignment between the fluorescence and Lyman-alpha emission could indicate an ionisation escape channel within the object. While the faintness of such a C II /C II* doublet makes it prohibitively difficult to pursue for similar systems with current facilities, we suggest it can become a valuable porosity diagnostic in the era of JWST and the upcoming generations of ELTs.

Type: Article
Title: Fluorescent C II* 1335A emission spectroscopically resolved in a galaxy at z = 5.754
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnrasl/slz081
Publisher version: http://dx.doi.org/10.1093/mnrasl/slz081
Language: English
Additional information: This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: dark ages, reionization, galaxies: evolution, galaxies: high-redshift
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/10075031
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