Okada, Yoko ORCID: 0000-0002-6838-6435, Higgins, Ronan, Ossenkopf-Okada, Volker, Guevara, Cristian, Stutzki, Juergen and Mertens, Marc (2019). First detection of [C-13 II] in the Large Magellanic Cloud. Astron. Astrophys., 631. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746
Full text not available from this repository.Abstract
Context. [C-13 II] observations in several Galactic sources show that the fine-structure [C-12 II] emission is often optically thick (the optical depths around 1 to a few). Aims. Our goal was to test whether this also affects the [C-12 II] emission from nearby galaxies like the Large Magellanic Cloud (LMC). Methods. We observed three star-forming regions in the LMC with upGREAT on board SOFIA at the frequency of the [C II] line. The 4 GHz bandwidth covers all three hyperfine lines of [C-13 II] simultaneously. For the analysis, we combined the [C-13 II] F = 1-0 and F = 1 1 hyperfine components as they do not overlap with the [C-12 II] line in velocity. Results. Three positions in N159 and N160 show an enhancement of [C-13 II] compared to the abundance-ratio-scaled [C-12 II] profile. This is likely due to the [C-12 II] line being optically thick, supported by the fact that the [C-13 II] line profile is narrower than [C-12 II], the enhancement varies with velocity, and the peak velocity of [C-13 II] matches the [O I] 63 mu m self-absorption. The [C-12 II] line profile is broader than expected from a simple optical depth broadening of the [C-13 II] line, supporting the scenario of several PDR components in one beam having varying [C-12 II] optical depths. The derived [C-12 II] optical depth at three positions (beam size of 14 '', corresponding to 3.4 pc) is 1-3, which is similar to values observed in several Galactic sources shown in previous studies. If this also applies to distant galaxies, the [C II] intensity will be underestimated by a factor of approximately 2.
Item Type: | Journal Article | ||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-127597 | ||||||||||||||||||||||||||||
DOI: | 10.1051/0004-6361/201936685 | ||||||||||||||||||||||||||||
Journal or Publication Title: | Astron. Astrophys. | ||||||||||||||||||||||||||||
Volume: | 631 | ||||||||||||||||||||||||||||
Date: | 2019 | ||||||||||||||||||||||||||||
Publisher: | EDP SCIENCES S A | ||||||||||||||||||||||||||||
Place of Publication: | LES ULIS CEDEX A | ||||||||||||||||||||||||||||
ISSN: | 1432-0746 | ||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/12759 |
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