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Annual Parallax Measurements of an Infrared Dark Cloud MSXDC G034.43+00.24

Published online by Cambridge University Press:  24 July 2012

Tomoharu Kurayama
Tomoharu Kurayama*
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan email: kurayama@sci.kagoshima-u.ac.jp
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Abstract

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We have measured the annual parallax of the H2O maser associated with an infrared dark cloud, MSXDC G034.43+00.24, with VERA. The parallax is 0.643 ± 0.049 mas, corresponding to a distance of 1.56+0.12−0.11 kpc. This value is less than half of the previous kinematic distance of 3.7 kpc. We revised the core-mass estimates of MSXDC G034.43+00.24 from the previous estimations of 1000M⊙ to hundreds of M⊙. The spectral type is still consistent with that of the massive star.

Keywords

astrometryIRDCstar formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 417 - 418
Copyright
Copyright © International Astronomical Union 2012

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