H2O masers in a jet-driven bow shock: episodic ejection from a massive young stellar object

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 22 Apr 2016Embargo end date: 01 Jan 2016 English Publisher:Oxford University Press (OUP)Journal:Monthly Notices of the Royal Astronomical Society, volume 460, pages 283-290 (issn: 0035-8711, eissn: 1365-2966,

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Authors: Burns, R. A.; Handa, T.; Nagayama, T.; Sunada, K.; Omodaka, T.;

doi: 10.1093/mnras/stw958 , 10.48550/arxiv.1604.05682

arXiv: 1604.05682

H2O masers in a jet-driven bow shock: episodic ejection from a massive young stellar object

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Abstract

We report the results of VERA multi-epoch VLBI 22 GHz water maser observations of S255IR-SMA1, a massive young stellar object located in the S255 star forming region. By annual parallax the source distance was measured as D = 1.78 +-0.12 kpc and the source systemic motion was (u alpha cos d, u d) = (-0.13 +- 0.20, -0.06 +- 0.27) mas yr-1. Masers appear to trace a U-shaped bow shock whose morphology and proper motions are well reproduced by a jet-driven outflow model with a jet radius of about 6 AU. The maser data, in the context of other works in the literature, reveal ejections from S255IR-SMA1 to be episodic, operating on timescales of ~1000 years.

accepted for publication in MNRAS

Related Organizations

National Astronomical Observatory of Japan
Japan
Kagoshima University
Japan

Keywords

Astrophysics - Solar and Stellar Astrophysics, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics - Astrophysics of Galaxies, Solar and Stellar Astrophysics (astro-ph.SR)

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