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Synthesis images of 6.7-GHz methanol masers

  • R. P. Norris
  • J. B. Whiteoak
  • J. L. Caswell
  • M. Wieringa
8. Methanol Masers in Star Forming Regions
Part of the Lecture Notes in Physics book series (LNP, volume 412)

Abstract

We have produced images of a number of galactic methanol sources in the 6.7 GHz (51−60A+) transition, and compared them with earlier maps of the 12.2-GHz (20 - 3-1 E) methanol masers. We find that, in several cases, the 6.7-GHz and 12.2-GHz maser positions are coincident to within 20 milliarcsec, placing a tight constraint on pumping mechanisms. We also confirm the 12.2-GHz result that the methanol masers tend to be located along lines, perhaps indicating jets, shock fronts, or edge-on protoplanetary discs.

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References

  1. Batrla, W., Matthews, H. E., Menten, K. M., Walmsley, C. M., 1987, Nature, 326, 49.Google Scholar
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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • R. P. Norris
    • 1
  • J. B. Whiteoak
    • 1
  • J. L. Caswell
    • 1
  • M. Wieringa
    • 1
  1. 1.Australia Telescope National FacilityCSIROEppingAustralia

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