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Carniani, S, Maiolino, R, Amorin, R, Pentericci, L, Pallottini, A, Ferrara, A, Willott, CJ, Smit, R, Matthee, J, Sobral, D, Santini, P, Castellano, M, De Barros, S, Fontana, A, Grazian, A and Guaita, L (2018) Kiloparsec-scale gaseous clumps and star formation at z=5-7. Monthly Notices of the Royal Astronomical Society, 478 (1). pp. 1170-1184. ISSN 0035-8711
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Abstract
We investigate the morphology of the [C II] emission in a sample of ‘normal’ star-forming galaxies at 5 < z < 7.2 in relation to their UV (rest-frame) counterpart. We use new Atacama Large Millimetre/submillimetre Array (ALMA) observations of galaxies at z ∼ 6–7, as well as a careful re-analysis of archival ALMA data. In total 29 galaxies were analysed, 21 of which are detected in [C II]. For several of the latter the [C II] emission breaks into multiple components. Only a fraction of these [C II] components, if any, is associated with the primary UV systems, while the bulk of the [C II] emission is associated either with fainter UV components, or not associated with any UV counterpart at the current limits. By taking into account the presence of all these components, we find that the L[CII]–SFR (star formation rate) relation at early epochs is fully consistent with the local relation, but it has a dispersion of 0.48 ± 0.07 dex, which is about two times larger than observed locally. We also find that the deviation from the local L[CII]–SFR relation has a weak anticorrelation with the EW(Ly α). The morphological analysis also reveals that [C II] emission is generally much more extended than the UV emission. As a consequence, these primordial galaxies are characterized by a [C II] surface brightness generally much lower than expected from the local Σ[CII]−ΣSFR relation. These properties are likely a consequence of a combination of different effects, namely gas metallicity, [C II] emission from obscured star-forming regions, strong variations of the ionization parameter, and circumgalactic gas in accretion or ejected by these primeval galaxies.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | Science & Technology; Physical Sciences; Astronomy & Astrophysics; galaxies: evolution; galaxies: high-redshift; galaxies: ISM; galaxies: formation; INTEGRAL FIELD SPECTROSCOPY; LY-ALPHA EMITTERS; C II EMISSION; HIGH-REDSHIFT; FORMING GALAXIES; CII EMISSION; MU-M; ALMA; LINE; REIONIZATION; Science & Technology; Physical Sciences; Astronomy & Astrophysics; galaxies: evolution; galaxies: high-redshift; galaxies: ISM; galaxies: formation; INTEGRAL FIELD SPECTROSCOPY; LY-ALPHA EMITTERS; C II EMISSION; HIGH-REDSHIFT; FORMING GALAXIES; CII EMISSION; MU-M; ALMA; LINE; REIONIZATION; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 16 Nov 2022 09:42 |
| Last Modified: | 16 Nov 2022 09:45 |
| DOI or ID number: | 10.1093/mnras/sty1088 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/18135 |
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