Ingallinera, A, Cavallaro, F, Loru, S, Marvil, J, Umana, G, Trigilio, C, Breen, S, Bordiu, C, Buemi, CS, Bufano, F, Collier, J, Etoka, S, Filipović, MD, Goldman, SR, Hopkins, AM, Koribalski, BS, Leto, P, Norris, RP, Riggi, S, Schillirò, F, Tremblay, C and van Loon, JT (2022) Evolutionary Map of the Universe (EMU): 18-cm OH-maser discovery in ASKAP continuum images of the SCORPIO field. Monthly Notices of the Royal Astronomical Society: Letters, 512 (1). ISSN 1745-3925

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<jats:title>Abstract</jats:title> <jats:p>Low- and intermediate-mass stars end their life dispersing their outer layers into the circumstellar medium, during the asymptotic and post-asymptotic giant branch phases. OH masers at 18 cm offer an effective way to probe their circumstellar environment. In this work we present the discovery of seven OH maser sources likely associated with such evolved stars from the visual inspection of ASKAP continuum images. These seven sources do not emit real continuum emission, but the high sensitivity of our images allows us to detect their maser emission, resembling continuum sources. To confirm their nature, we carried out spectral-line observations with ATCA. All the sources showed the double-peaked spectra at 1612 MHz, typical of evolved stars. The detection of maser emission in continuum images can be a complementary and easy-to-use method to discover new maser sources with the large-area deep surveys conducted with the SKA precursors. The implication for radio stars studies are remarkable since pure OH maser sources (i.e. with no continuum associated) represent, at a sensitivity of $100\ \mu \mathrm{Jy\ beam}^{-1}$, about 4 percent of all Galactic sources and by far the most numerous stellar population.</jats:p>

Item Type: Article
Additional Information: © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society. The final version of this article and all relevant information related to it, including copyrights, can be found on the publisher website at;
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 09 Mar 2022 15:10
Last Modified: 09 Mar 2022 15:10

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