Space--VLBI observations of the OH maser OH 34.26+0.15: low interstellar scattering
| Autor: | Ed Fomalont, Sean M. Dougherty, A. I. Smirnov, B. A. Poperechenko, Katsunori M. Shibata, A. V. Kovalenko, V. G. Grachev, B. Carlson, John Reynolds, V. I. Altunin, V. I. Slysh, M. V. Popov, D. R. Jiang, Yu. N. Gorshenkov, I. E. Val'tts, M. A. Voronkov, Tomofumi Umemoto, Victor Migenes, B. Z. Kanevsky |
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| Rok vydání: | 2001 |
| Předmět: |
Physics
Scattering Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics law.invention Radio telescope Pulsar Space and Planetary Science law Brightness temperature Very-long-baseline interferometry Astrophysics::Solar and Stellar Astrophysics Angular resolution Maser Astrophysics::Galaxy Astrophysics Line (formation) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 320:217-223 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1046/j.1365-8711.2001.03959.x |
| Popis: | We report on the first space-VLBI observations of the OH34.26+0.15 maser in two main line OH transitions at 1665 and 1667 MHz. The observations involved the space radiotelescope 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 milliarcsec 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 6x10^{12} K 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. Comment: 8 pages, 2 tables, 9 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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