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Space–VLBI observations of the OH maser OH 34.26+0.15: low interstellar scattering |
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| Authors: | V. I. Slysh M. A. Voronkov V. Migenes K. M. Shibata T. Umemoto V. I. Altunin I. E. Val'Tts B. Z. Kanevsky M. V. Popov A. V. Kovalenko E. B. Fomalont B. A. Poperechenko YU. N. Gorshenkov B. R. Carlson S. M. Dougherty J. E. Reynolds D. R. Jiang A. I. Smirnov V. G. Grachev |
| Affiliation: | Astro Space Centre of Lebedev Physical Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia;University of Guanajuato, Department of Astronomy, Apdo Postal 144, Guanajuato, CP 36000, GTO, Mexico;National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181, Japan;Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA;Special Research Bureau, Moscow Power Engineering Institute, Krasnokazarmennaya str. 14, 111250 Moscow, Russia;Dominion Radio Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, PO Box 248, Penticton, BC, Canada V2A 6K3;Australia Telescope National Facility, PO Box 76, Epping, NSW 2121, Australia;Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200080, China;Institute of Applied Astronomy, Zhdanovskaya str. 8, 197042 St. Petersburg, Russia |
| Abstract: | We report on the first space–VLBI observations of the OH 34.26+0.15 maser in two main-line OH transitions at 1665 and 1667 MHz. The observations involved the space radio telescope on board the Japanese satellite HALCA and an array of ground radio telescopes. The map of the maser region and images of individual maser spots were produced with an angular resolution of 1 mas, which is several times higher than the angular resolution available on the ground. The maser spots were only partly resolved and a lower limit to the brightness temperature was obtained. The maser seems to be located in the direction of low interstellar scattering, an order of magnitude lower than the scattering of a nearby extragalactic source and pulsar. |
| Keywords: | masers scattering stars: formation H ii regions ISM: molecules |