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- W3100404484 abstract "We have used the Very Long Baseline Array to measure the annual parallax of the H2O masers in the star-forming region IRAS 00420+5530. This measurement yields a direct distance estimate of 2.17 ± 0.05 kpc (an error of less than 3%), which disagrees substantially with the standard kinematic distance estimate of ∼4.6 kpc (according to the rotation curve of Brand & Blitz), as well as most of the broad range of distances (1.7–7.7 kpc) used in various astrophysical analyses in the literature. The three-dimensional space velocity of IRAS 00420+5530 at this new, more accurate distance implies a substantial noncircular and anomalously slow Galactic orbit, consistent with similar observations of W3(OH) (Xu et al. and Hachisuka et al.), as well as line-of-sight velocity residuals in the rotation curve analysis of Brand & Blitz. The Perseus spiral arm of the Galaxy is thus more than a factor of 2 closer than previously presumed, and exhibits motions substantially at odds with axisymmetric models of the rotating Galaxy." @default.
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- W3100404484 date "2009-03-14" @default.
- W3100404484 modified "2023-10-10" @default.
- W3100404484 title "A PRECISE DISTANCE TO IRAS 00420+5530 VIA H<sub>2</sub>O MASER PARALLAX WITH THE VLBA" @default.
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- W3100404484 doi "https://doi.org/10.1088/0004-637x/694/1/192" @default.
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