Region of the outburst of H2O maser emission in Orion KL.
Abstract
The fine structure of the H2O maser outburst in Orion KL was studied with VLBI methods in 1979 - 1986. The main emission is produced by a chain of the compact features oriented under the angle -80°. The size, velocity, polarization and position angles of the features are estimated. Brightness temperatures and profiles of the components are given, as well as the density of H2O molecules at the line of sight. The masers are unsaturated and their kinetic temperature is Tk ≤ 120K. It is supposed that the pumping energy is IR and anisotropic. The outburst region corresponds to expanding protoplanetary rings with radius 6 A.U., rotation velocity 5 km/s and expanding velocity 3.8 km/s. The mass of the protostar is 0.7 M_sun;.
- Publication:
-
Pisma v Astronomicheskii Zhurnal
- Pub Date:
- December 1988
- Bibcode:
- 1988PAZh...14.1101M
- Keywords:
-
- Interstellar Masers;
- Orion Constellation;
- Very Long Base Interferometry;
- Water Masers;
- Brightness Temperature;
- Fine Structure;
- Polarization Characteristics;
- Astrophysics