Astrophysics and Space Science

, Volume 118, Issue 1–2, pp 531–533 | Cite as

Distance to the anti-center shell

  • Shrinivas R. Kulkarni
  • R. Mathieu
Section 5b: Galaxies and Cosmology


Heiles (1984) has identified a large angular diameter (∼30°), anomalous velocity H I structure in the anti-center region of the Galaxy. The distance to this structure is the key to understanding of the energetics and, hence, the origin. Distance estimates based on indirect arguments have ranged from less than 100 pc to a few kiloparsecs. We report the absence of any anomalous velocity Ca K absorption features in high sensitivity echelle spectra towards 17 stars located within the boundaries of this structure. We conclude that the structure is definitely beyond 500 pc and barring unusually low Ca II abundance is more distant than 2.5 kpc. This results supports the hypothesis that the anti-center structure is the result of collision of high-velocity clouds with the galactic H I disk.


Absorption Feature Distance Estimate Angular Diameter Indirect Argument Anomalous Velocity 
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Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • Shrinivas R. Kulkarni
    • 1
  • R. Mathieu
    • 2
  1. 1.Dept. of AstronomyUniv. of CaliforniaBerkeleyU.S.A.
  2. 2.Center for AstrophysicsCambridgeU.S.A.

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