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Título: | Modelled 3D distribution of OH/IR stars in the Galactic disc |
Autor: | Uno, Y.; Imai, H.; Shinano, K.; Qiao, H. -H.; Dawson, J.R.; Breen, S. L.; Gómez Rivero, José Francisco | Palabras clave: | Masers Stars: AGB and post-AGB Stars: winds Outflows H II regions Galaxy: disc |
Fecha de publicación: | abr-2021 | Editor: | Oxford University Press | Citación: | Monthly Notices of the Royal Astronomical Society 502(2): 3012-3020 (2021) | Resumen: | We have modelled the 3D distribution of OH/IR stars in the Galactic plane, traced by 1612 MHz OH maser sources with classic double horned spectral profiles. We statistically analysed over 700 maser sources detected by the HI/OH/Recombination line survey of the Milky Way (THOR) and the Australia Telescope Compact Array interferometric follow-up observations of the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH). With a simple model constructed from a classical density distribution of stars and luminosity functions of OH maser sources in the Galaxy, we estimate the scale height, or the half thickness of the OH/IR star distribution along the Galactic disc to be 90–290 pc. The simple model also implies that there are ∼4000 OH/IR stars hosting 1612 MHz OH masers along the Galactic Plane. Therefore, next generation telescopes such as the Australian Square Kilometre Array Pathfinder (ASKAP) and SKA Phase 1 will detect about 80 per cent of such OH/IR stars in the Galaxy at a 10 mJy detection limit. Comparing the data of previously detected circumstellar 1612 MHz OH maser sources with those of THOR and SPLASH, the maser source lifetime is estimated to be ∼300 yr. This is likely a lower limit, since non-detections of masers in some cases could be affected by the flux variation of the maser source. © 2021 The Author(s). | Versión del editor: | http://dx.doi.org/10.1093/mnras/stab176 | URI: | http://hdl.handle.net/10261/247902 | DOI: | 10.1093/mnras/stab176 | ISSN: | 0035-8711 | E-ISSN: | 1365-2966 |
Aparece en las colecciones: | (IAA) Artículos |
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2021MNRAS.502.3012U.pdf | 1,05 MB | Adobe PDF | Visualizar/Abrir |
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