VLBI observations of the H2O supermaser outburst in the orion nebula
We have conducted a campaign of annual VLBI observations of the H2O supermaser region in the Orion-KL. Most of our observations have been conducted with a small number (≈ 3) of antennas. Here we report on a 7 station observation taken in 1985. We have produced an image of the supermaser region. Our data indicate that the masers lie along an approximately E-W line, and that there is a significant velocity gradient across the maser region. We suggest that the masers originate in several thin rings in a rotating, expanding disc of gas and dust.
KeywordsFlux Density Optical Depth Position Angle Compact Component VLBI Observation
Unable to display preview. Download preview PDF.
- Abraham, Z., Vilas Boas, J.W.S. and del Campo, L.F., 1986, Astr. Ap., 167, 311.Google Scholar
- Garay, G., Moran, J. M. and Haschick, A. D., 1989, Ap. J., 338, 244.Google Scholar
- Matveyenko, L. I., Graham, D. A. and Diamond, P. J., 1988, Sov. Astron. Letters, 14, 468.Google Scholar
- Reid, M. J. and Moran, J. M., 1981, Ann. Rev. Astr. Ap., 19, 231.Google Scholar
- Varshalovich, A., 1971, Uspechi Fiz. Nauk, 13, 429.Google Scholar
- Western, R. and Watson, W. D., 1983, Ap. J., 275, 195.Google Scholar
- Western, R. and Watson, W. D., 1989, Ap. J., 285, 158.Google Scholar