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A precise distance to IRAS 00420+5530 via H2O maser parallax with the VLBA

Published online by Cambridge University Press:  01 March 2007

G. A. Moellenbrock ,
M. J. Claussen  and
W. M. Goss
G. A. Moellenbrock
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA email: gmoellen@nrao.edu, mclausse@nrao.edu, mgoss@nrao.edu
M. J. Claussen
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA email: gmoellen@nrao.edu, mclausse@nrao.edu, mgoss@nrao.edu
W. M. Goss
Affiliation:
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA email: gmoellen@nrao.edu, mclausse@nrao.edu, mgoss@nrao.edu
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Abstract

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We have used the VLBA to measure the annual parallax of the H2O masers in the star-forming region IRAS 00420+5530 (l=122.0°, b= -7.1°). This measurement yields a direct distance estimate of 2.17±0.05kpc, which disagrees substantially with most other published estimates (a range from 1.7 to 7.7kpc). This distance is consistent with recent parallax-based distances reported for W3(OH) (Xu et al. 2006, Hachisuka et al. 2006), lending additional support to the conclusion that the Perseus Spiral Arm of the Milky Way is a factor of at least two closer than kinematic distance estimates imply at galactic longitude ~130 degrees.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 168 - 169
Copyright
Copyright © International Astronomical Union 2008

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