Bow shocks in a newly discovered maser source in IRAS 20231+3440
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Date
2017Author
Ogbodo, C.S.
Chibueze, J.O.
Burns, R.A.
Handa, T.
Omodaka, T.
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From measuring the annual parallax of water masers over 1.5 yr with VLBI Exploration of
Radio Astrometry, we present the trigonometric parallax and corresponding distance of another
newly identified water maser source in the region of IRAS 20231+3440 as π = 0.611 ± 0.022
mas and D=1.64±0.06 kpc, respectively.We measured the absolute proper motions of all the
newly detected maser spots (30 spots) and presented two pictures describing the possible spatial
distribution of the water maser as the morphology marks out an arc of masers whose average
proper motion velocity in the jet direction was 14.26 km s−1. As revealed by the ALLWISE
composite image and by applying the colour–colour method of young stellar objects (YSO)
identification and classification on photometric archived data, we identified the driving source
of the north maser group to be a class I, young stellar object. To further probe the nature of
the progenitor, we used the momentum rate maximum value (1.2×10−4 M yr−1 km s−1)
of the outflow to satisfy that the progenitor under investigation is a low-mass young stellar
object concurrently forming alongside an intermediate-mass YSO ∼60 000 au (∼37 arcsec)
away from it
URI
http://hdl.handle.net/10394/25576https://doi.org/10.1093/mnras/stx1154
https://academic.oup.com/mnras/article/469/4/4788/3820927/Bow-shocks-in-a-newly-discovered-maser-source-in