Space-VLBI observations of the OH maser OH 34.26+0.15: low interstellar scattering

Authors
Slysh, VI Voronkov, MA Migenes, V Shibata, KM Umemoto, T Altunin, VI Val'tts, IE Kanevsky, BZ Popov, MV Kovalenko, AV Fomalont, EB Poperechenko, BA Gorshenkov, YN Carlson, BR Dougherty, SM Reynolds, JE Jiang, DR Smirnov, AI Grachev, VG
Citation
Vi. Slysh et al., Space-VLBI observations of the OH maser OH 34.26+0.15: low interstellar scattering, M NOT R AST, 320(2), 2001, pp. 217-223
Citations number
19
Categorie Soggetti
Space Sciences
Journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN journal
00358711 → ACNP
Volume
320
Issue
2
Year of publication
2001
Pages
217 - 223
Database
ISI
SICI code
0035-8711(20010111)320:2<217:SOOTOM>2.0.ZU;2-H
Abstract
We report on the first space-VLBI observations of the OH 34.26+0.15 maser i n two main-line OH transitions at 1665 and 1667 MHz. The observations invol ved 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 6 x 10(12) K was obtained. The maser seems to be loc ated in the direction of low interstellar scattering, an order of magnitude lower than the scattering of a nearby extragalactic source and pulsar.