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

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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
Creators:
CreatorsEmailORCIDORCID Put Code
Okada, YokoUNSPECIFIEDorcid.org/0000-0002-6838-6435UNSPECIFIED
Higgins, RonanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ossenkopf-Okada, VolkerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guevara, CristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, JuergenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mertens, MarcUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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
Uncontrolled Keywords:
KeywordsLanguage
INTERSTELLAR; ABUNDANCES; CARBON; LINEMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12759

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