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VLBA Imaging of 12.2 GHz Methanol Masers

  • S. P. Ellingsen (a1), P.M. McCulloch (a1), P. J. Diamond (a2) and R. P. Norris (a3)

Abstract

We have used the VLBA to image the 12.2 GHz (20-3−1 E) masing transition of methanol toward the massive star formation region G345.01+1.79. The maser spots are distributed in a curved structure with a near monotonic velocity distribution along the curve. The cluster of maser emission covers an area of approximately 200 milli-arcseconds in right ascension and 70 milli-arcseconds in declination.

Comparison of the positions of the 12.2 GHz methanol maser spots in G345.01+1.79 as determined from the 1995 VLBA observations with 1988 Parkes-Tidbinbilla Interferometer observations shows that the relative positions of the maser spots detected in both epochs has changed by less than 5 milli-arcseconds during that interval. Assuming a distance of 2.3 kpc to G345.01+1.79 implies an upper limit on the relative tangential velocities of the maser spots of 7 km s−1.

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References

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Batrla, W., et al. 1987. Nature, 326, 4951.
Menten, K.M. 1991. ApJ, 380, L7578.
Norris, R.P., et al. 1988. Nature, 335, 149151.
Norris, R.P., et al. 1993. ApJ, 412, 222232.

VLBA Imaging of 12.2 GHz Methanol Masers

  • S. P. Ellingsen (a1), P.M. McCulloch (a1), P. J. Diamond (a2) and R. P. Norris (a3)

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