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VERA astrometry of the Galactic Superbubble NGC 281

Published online by Cambridge University Press:  17 September 2012

M. Sato ,
T. Hirota ,
M. Honma  and
H. Kobayashi
M. Sato
Affiliation:
VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
T. Hirota
Affiliation:
VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
M. Honma
Affiliation:
VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
H. Kobayashi
Affiliation:
VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
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Abstract

We have used the Japanese VLBI array VERA to perform high-precision astrometry of an H2O maser source in the Galactic superbubble NGC 281. We successfully detected a trigonometric parallax of 0.355±0.030 mas, corresponding to a source distance of 2.82±0.24 kpc. The source distance as well as the absolute proper motions were used to demonstrate the 3D structure and expansion of the NGC 281 superbubble, ∼650 pc in size parallel to the Galactic disk, indicating the superbubble expansion may be confined to the disk. We estimate the expansion velocity of the superbubble as ∼20 km s−1 both perpendicular to and parallel to the Galactic disk with a consistent timescale of ∼20 Myr.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 151 - 154
Copyright
© EAS, EDP Sciences, 2012

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References

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