Sewiło, M, Indebetouw, R, Charnley, SB, Zahorecz, S, Oliveira, JM, van Loon, JT, Ward, JL, Chen, C-HR, Wisemen, J, Fukui, Y, Kawamura, A, Meixner, M, Onishi, T and Schilke, P (2018) The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud. Astrophysical Journal Letters, 853 (2). L19 -?. ISSN 2041-8213

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We report the first extragalactic detection of the complex organic molecules (COMs) dimethyl ether (CH3OCH3) and methyl formate (CH3OCHO) with the Atacama Large Millimeter/submillimeter Array (ALMA). These COMs, together with their parent species methanol (CH3OH), were detected toward two 1.3 mm continuum sources in the N 113 star-forming region in the low-metallicity Large Magellanic Cloud (LMC). Rotational temperatures (${T}_{\mathrm{rot}}\sim 130$ K) and total column densities (${N}_{\mathrm{rot}}\sim {10}^{16}$ cm−2) have been calculated for each source based on multiple transitions of CH3OH. We present the ALMA molecular emission maps for COMs and measured abundances for all detected species. The physical and chemical properties of two sources with COMs detection, and the association with H2O and OH maser emission, indicate that they are hot cores. The fractional abundances of COMs scaled by a factor of 2.5 to account for the lower metallicity in the LMC are comparable to those found at the lower end of the range in Galactic hot cores. Our results have important implications for studies of organic chemistry at higher redshift.

Item Type: Article
Additional Information: © IOP Publishing. This is the final published version of the article (version of record). It first appeared online via IOP at - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: astrochemistry, galaxies, star formation, Magellanic Clouds, stars, protostars
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 14 Feb 2018 13:30
Last Modified: 16 Oct 2018 14:47

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