EAS Publications Series
Volume 56, 2012The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall?
|Page(s)||151 - 154|
|Section||Energizing the Disk-Halo: Star Formation, SNE, CRS and Feedback|
|Published online||17 September 2012|
Miguel A. de Avillez (ed)
EAS Publications Series, 56 (2012) 151–154
VERA astrometry of the Galactic Superbubble NGC 281
VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
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.
© EAS, EDP Sciences, 2012