SIMBAD references

2009ApJ...694..192M - Astrophys. J., 694, 192-204 (2009/March-3)

A precise distance to IRAS 00420+5530 via H2 O maser parallax with the VLBA.


Abstract (from CDS):

We have used the Very Long Baseline Array to measure the annual parallax of the H2 O 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.

Abstract Copyright:

Journal keyword(s): astrometry - Galaxy: structure - masers - stars: distances - stars: individual: IRAS 00420+5530 - techniques: interferometric

Simbad objects: 9

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