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19th of November 2018
Investigations of methanol masers in NGC 4945
by McCarthy et al.
McCarthy et al. have used the Australia Telescope Compact Array (ATCA) to conduct observations of the 36.2 GHz 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 synthesised beam of 6 arcseconds × 4 arcsecond (corresponding to 350 x 235 light-years). Other transitions of methanol, and spectral lines of other molecular species were also obtained, including strong detections of HC3N and CS. The image above shows the 36.2 GHz spectrum from the region of peak emission, revealing several spectral features: the 55 mJy primary component has a velocity of 673 km/s, redshifted with respect to the systemic velocity of NGC 4945 of 585 km/s, with two significantly lower flux density (∼15 mJy) components at 643 and 705 km/s. Full results are published in the Monthly Notices of the Royal Astronomical Society

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