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Investigations of the Class I methanol masers in NGC 4945

McCarthy, TP, Ellingsen, SP ORCID: 0000-0002-1363-5457, Breen, SL, Henkel, C, Voronkov, MA and Chen, X 2018 , 'Investigations of the Class I methanol masers in NGC 4945' , Monthly Notices of the Royal Astronomical Society, vol. 480 , pp. 4578-4588 , doi: 10.1093/mnras/sty2192.

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Abstract

We have used the Australia Telescope Compact Array (ATCA) to conduct further observations of the 36.2-GHz (4−1 → 30E) methanol transition towards the nearby active galaxy NGC 4945. These observations have led to a more accurate determination of the offset between the maser emission and the nucleus of NGC 4945 with a typical synthesized beam of 6 arcsec × 4 arcsec (108 × 72 pc). This corresponds to a factor of 4 improvement with respect to the major axis of the beam. Other transitions of methanol and lines of other molecular species were obtained alongside the 36.2-GHz methanol emission, with strong detections of HC3N (J = 4 → 3) and CS (J = 1 → 0) presented here. We do not detect thermal methanol (5σ upper limit of 5 mJy in a 6 km s−1 channel) from the 48.4-GHz (10 → 00A+) ground-state transition, nor emission from the 44.1-GHz (70 → 61A+) class I maser transition (5σ upper limit of 6 mJy in a 3 km s−1 channel). We also present a comparison of the class I maser emission observed towards NGC 4945 with that from NGC 253 and towards the Galactic giant molecular cloud G 1.6-0.025.

Item Type: Article
Authors/Creators:McCarthy, TP and Ellingsen, SP and Breen, SL and Henkel, C and Voronkov, MA and Chen, X
Keywords: masers–galaxies:starburst–radiolines:galaxies
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/sty2192
Copyright Information:

Copyright 2018 The Author(s)

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