Issue EAS Publications Series Volume 10, 2003 JENAM 2002, Galactic & Stellar Dynamics Page(s) 203 DOI 10.1051/eas:2003150

Galactic & Stellar Dynamics
C. Boily, P. Patsis, S. Portegies Zwart, R. Spurzem and C. Theis (eds)
EAS Publications Series, Vol. 10, 2003
DOI: 10.1051/eas:2003150

Detection of water vapor maser in a narrow-line Seyfert 1 nucleus

Y. Hagiwara¹, P.J. Diamond, E. Rovilos² and M. Miyoshi<sup>3

1</sup>  ASTRON, Westerbork Observatory, P.O. Box 2, Dwingeloo, 7990 AA, The Netherlands
²  Jodrell Bank Observatory, University of Manchester, UK
³  National Astronomical Observatory, Mitaka, Japan

Abstract
We have discovered 22 GHz water vapor maser toward a narrow-line type 1 (NLS1) Seyfert galaxy, NGC 4051. The detection of water masers in such galaxies is very rare. The Doppler-shifted maser components symmetrically straddle a component lying at about 712 km s ^-1. The location of each maser component is of great interest for studying galactic dynamical structures around an active nucleus. We report on preliminary results of VLA observations.

© EAS, EDP Sciences 2003

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