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Space-VLBI observations of OH masers

Published online by Cambridge University Press:  03 August 2017

Vyacheslav I. Slysh
Affiliation:
Astro Space Center, Profsouznaya st. 84/32, 117810 Moscow, Russia
Maxim A. Voronkov
Affiliation:
Astro Space Center, Profsouznaya st. 84/32, 117810 Moscow, Russia
Irina E. Val'tts
Affiliation:
Astro Space Center, Profsouznaya st. 84/32, 117810 Moscow, Russia
Victor Migenes
Affiliation:
University of Guanajuato, Department of Astronomy, Apdo Postal 144, Guanajuato, CP36000, GTO, Mexico
K.M. Shibata
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181, Japan
Tomofumi Umemoto
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181, Japan
Makoto Inoue
Affiliation:
National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181, Japan

Abstract

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We report on the first space-VLBI observations of the OH masers 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 maps 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 × 1012 K was obtained. The masers seem to be located in the direction of low interstellar scattering.

Type
Part 1. Star Formation
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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