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

Abstract

We have measured the annual parallax of the H2O maser source associated with an infrared dark cloud MSXDC G034.43+00.24 from the observations with VERA (VLBI Exploration of Radio Astrometry). The parallax is 0.643 +/- 0.049 mas, corresponding to the distance of 1.56 +0.12/-0.11 kpc. This value is less than the half of the previous kinematic distance of 3.7 kpc. We revise the core mass estimates of MSXDC G034.43+00.24, based on virial masses, LTE masses and dust masses and show that the core masses decrease from the previous estimations of ~1000 Mo to hundreds of Mo. The spectral type derived from the luminosity also changes from O9.5 to B1 in the case of MM1. This spectral type is still consistent with that of the massive star. The radial velocity derived from the flat rotation model is smaller than the observed velocity, which corresponds to the peculiar motion of ~40 km/s in the line-of-sight direction.

14 pages, 11 figures, accepted to PASJ (vol. 63, No. 3)

References in corpus (4)

• Trigonometric Parallax of W51 Main/South
• The origin of large peculiar motions of star-forming regions and spiral structures of our Galaxy
• Molecular Outflows and a Mid-Infrared Census of the Massive Star-Formation Region Associated with IRAS 18507+0121
• New Distance and Revised Natures of High Mass Star Formation in G5.89-0.39

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