Polarization of the H2O maser emission from Orion KL at epoch 2011.7

• Published in: Astronomy letters 2012-09, Vol.38 (9), p.575-580
• Main Authors: Matveyenko, L. I., Demichev, V. A., Ipatov, A. V., Melnikov, A. E., Surkis, I. F.
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics and Astroparticles; Emissions; Observations and Techniques; Physics; Physics and Astronomy; Polarization; Quasars; Velocity
• ISSN: 1063-7737; 1562-6873
• DOI: 10.1134/S1063773712090022

Polarization observations of the H 2 O maser emission at 1.35 cm from the active region Orion KL were carried out at epoch 2011.7 on the Svetloe-Zelenchukskaya radio interferometer. The observational data have been processed on the correlator of the QUASAR network. Fragments of the structure have been identified; the line velocities and profile widths and the emission polarization have been determined. The component at the radial velocity V = 7.0 km s −1 has been taken as a reference one. Its effective size in the Gaussian approximation is 1.5 mas, the axial ratio is Major/Minor = 3.3, and the orientation is PA = 11°. The component V = 7.6 km s −1 corresponds to a bipolar outflow with an effective size of 6.2 mas, the axial ratio is Major/Minor = 5.3, and the orientation −32°. The bipolar outflow is 10 mas away from the reference feature in the direction of 173°. The longitudinal velocity components of the NW and SE parts of the bipolar outflow in the local standard of rest are +0.15 and −0.15 km s −1 , respectively. The degrees of polarization of the emission from the reference feature (7.0 km s −1 ) and the bipolar outflow are m = 39 and 52%, respectively. The difference in polarization orientations of both components Δ χ does not exceed 3°.