The IC133 Water Vapor Maser in the Galaxy M33: A Geometric Distance

(2) Max-Planck-Institut fuer Radioastronomie; (3) Nobeyama Radio Observatory); A. L. Argon (1); J. M. Moran (1); K. M. Menten (2); L. J. Greenhill (1); M. Inoue (3) ((1) Harvard-Smithsonian Center for Astrophysics; M. J. Reid (1)

arxiv: astro-ph/0407486 · v1 · submitted 2004-07-22 · 🌌 astro-ph

The IC133 Water Vapor Maser in the Galaxy M33: A Geometric Distance

A. L. Argon (1) , L. J. Greenhill (1) , J. M. Moran (1) , M. J. Reid (1) , K. M. Menten (2) , M. Inoue (3) ((1) Harvard-Smithsonian Center for Astrophysics , (2) Max-Planck-Institut fuer Radioastronomie , (3) Nobeyama Radio Observatory) This is my paper

classification 🌌 astro-ph

keywords distanceic133galaxymasercalibrationscepheidcheckcommon

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We report on the results of a 14 year long VLBI study of proper motions in the IC133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the 3-dimensional structure and dynamics of IC133 and obtain a distance estimate, 800 +/- 180 kpc. Our technique for determining the distance to M33 is independent of calibrations common to other distance indicators, such as Cepheid Period-Luminosity relations, and therefore provides an important check for previous distance determinations.

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The IC133 Water Vapor Maser in the Galaxy M33: A Geometric Distance

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