High resolution OH maser survey in star forming regions

Details High resolution OH maser survey in star forming regions High resolution OH maser survey in star forming regions

2006-03-24

arxiv.org/abs/astro-ph/0603695v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure., To appear in the Proceedings of the "11th Latin American IAU Regional Meeting of Astronomy" LARIM2005, Dec

Scientific paper

We present results of a high resolution survey of OH masers in Galactic Star Forming Regions in order to study the maser emission and establish a list of suitable candidates for higher resolution instruments follow up. We used the Very Long Baseline Array (VLBA) to observe the 1665, 1667, 1612 and 1720 MHz OH maser transitions within 41 regions. These are the first high resolution observations for most of the sources. For all the transitions 30 sites of maser emission were detected, 4 of the sources have new detections, and approximately 40% of the sources in the sample exhibit highly compact structure. Finally we consider that the spectrum observed in W75N shows the early stage of a long period OH maser flare in the 1665 MHz line, the first of its kind.

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