Publication: The IC 133 Water Vapor Maser in the Galaxy M33: A Geometric Distance
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Date
2004
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IOP Publishing
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Citation
Argon, A. L., L. J. Greenhill, J. M. Moran, M. J. Reid, K. M. Menten, and M. Inoue. 2004. “The IC 133 Water Vapor Maser in the Galaxy M33: A Geometric Distance.” The Astrophysical Journal 615 (2) (November 10): 702–719. doi:10.1086/424731.
Research Data
Abstract
We report on the results of a 14 year long VLBI study of proper motions in the IC 133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the 3-dimensional structure and dynamics of IC 133 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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Keywords
galaxies: individual (M33), interferometry, ISM: individual (IC 133), masers
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