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Absolute proper motions of water masers in NGC 281 measured with VERA

Published online by Cambridge University Press:  01 March 2007

Mayumi Sato ,
Tomoya Hirota ,
Mareki Honma  and
Hideyuki Kobayashi
Mayumi Sato
Affiliation:
VERA Office, National Astronomical Observatory, 2-21-1 Osawa, Tokyo 181-8588JAPAN email: [email protected] Department of Astronomy, The University of Tokyo, Hongo 7-3-1, Tokyo 113-0033, JAPAN
Tomoya Hirota
Affiliation:
VERA Office, National Astronomical Observatory, 2-21-1 Osawa, Tokyo 181-8588JAPAN email: [email protected]
Mareki Honma
Affiliation:
VERA Office, National Astronomical Observatory, 2-21-1 Osawa, Tokyo 181-8588JAPAN email: [email protected]
Hideyuki Kobayashi
Affiliation:
VERA Office, National Astronomical Observatory, 2-21-1 Osawa, Tokyo 181-8588JAPAN email: [email protected]
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Abstract

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We report on absolute proper-motion measurements of H2O maser features in the NGC 281 West molecular cloud, located ~320 pc above the Galactic plane and associated with an HI loop extending from the Galactic plane. We conducted six-epoch phase-referencing observations of the maser source with VERA (VLBI Exploration of Radio Astrometry) over six months since May 2006. The H2O maser features are found to be systematically moving toward the southwest and further away from the Galactic plane with a vertical velocity of ~20–30 km s−1 at its estimated distance of 2.2–3.5 kpc. Our new results provide the most direct evidence that the gas in the NGC 281 region was blown out from the Galactic plane, most likely in a superbubble driven by multiple or sequential supernova explosions in the Galactic plane.

Keywords

astrometryGalaxy: kinematics and dynamicsISM: bubblesmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 170 - 171
Copyright
Copyright © International Astronomical Union 2008

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