• DOI:10.1093/mnras/sty2192
• Corpus ID: 119061652

Investigations of the Class I methanol masers in NGC 4945

@article{McCarthy2018InvestigationsOT,
  title={Investigations of the Class I methanol masers in NGC 4945},
  author={Tiege P. McCarthy and Simon P. Ellingsen and Shari L. Breen and Christian Henkel and Maxim A. Voronkov},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018}
}

• T. P. McCarthy, S. Ellingsen, +2 authors M. Voronkov
• Published 9 August 2018
• Physics
• Monthly Notices of the Royal Astronomical Society

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.