Evolutionary map of the Universe (EMU): 18-cm OH-maser discovery in ASKAP continuum images of the SCORPIO field. Issue 1 (22nd February 2022)
- Record Type:
- Journal Article
- Title:
- Evolutionary map of the Universe (EMU): 18-cm OH-maser discovery in ASKAP continuum images of the SCORPIO field. Issue 1 (22nd February 2022)
- Main Title:
- Evolutionary map of the Universe (EMU): 18-cm OH-maser discovery in ASKAP continuum images of the SCORPIO field
- Authors:
- Ingallinera, A
Cavallaro, F
Loru, S
Marvil, J
Umana, G
Trigilio, C
Breen, S
Bordiu, C
Buemi, C S
Bufano, F
Collier, J
Etoka, S
Filipović, M D
Goldman, S R
Hopkins, A M
Koribalski, B S
Leto, P
Norris, R P
Riggi, S
Schillirò, F
Tremblay, C
van Loon, J Th - Abstract:
- ABSTRACT: 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 Australian SKA Pathfinder (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 Square Kilometre Array (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 per cent of all Galactic sources and by far the most numerous stellar population.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 512:Issue 1(2022)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 512:Issue 1(2022)
- Issue Display:
- Volume 512, Issue 1 (2022)
- Year:
- 2022
- Volume:
- 512
- Issue:
- 1
- Issue Sort Value:
- 2022-0512-0001-0000
- Page Start:
- L21
- Page End:
- L26
- Publication Date:
- 2022-02-22
- Subjects:
- masers -- methods: observational -- techniques: image processing -- stars: AGB and post-AGB -- circumstellar matter -- radio lines: stars
Astronomy -- Research -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-3933 ↗
http://www.blackwell-synergy.com/loi/mnl ↗
http://www3.interscience.wiley.com/journal/118500770/home ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnrasl/slac017 ↗
- Languages:
- English
- ISSNs:
- 1745-3933
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5944.000100
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 20740.xml