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3D motions of 6.7 GHz methanol masers and effects of the Galactic bar

Published online by Cambridge University Press:  26 February 2013

Naoko Matsumoto ,
Mareki Honma  and
the VERA collaboration
Naoko Matsumoto
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan email: naoko.matsumoto@nao.ac.jp
Mareki Honma
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan email: naoko.matsumoto@nao.ac.jp Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo, Japan email: mareki.honma@nao.ac.jp
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Abstract

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To search for kinematic evidence of the existence of the Galactic bar, we observed 10 methanol maser sources at the near end of the bar with VERA (VLBI Exploration of Radio Astrometry). From these observations, we obtained absolute proper motions of eight sources based on the phase-referencing technique. We compared the motions with the predictions of three simple models in a 3D plane. This comparison showed that a non-flat circular rotation model and a dynamical model including a bar potential reproduce the observed data better than a flat rotation model. In addition, the bar model suggests that the inclination angle of the Galactic bar is around 35°, which is consistent with previous studies.

Keywords

masersastrometryGalaxy: kinematics and dynamicsradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 410 - 413
Copyright
Copyright © International Astronomical Union 2013

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