VLA observations of 6-cm excited OH

Details VLA observations of 6-cm excited OH VLA observations of 6-cm excited OH

2003-10-15

arxiv.org/abs/astro-ph/0310434v1

Mon.Not.Roy.Astron.Soc. 347 (2004) 1164

Astronomy and Astrophysics

Astrophysics

11 pages, will require MN style file to process. MNRAS, accepted Oct 15, 2003

Scientific paper

10.1111/j.1365-2966.2004.07280.x

The VLA was used to determine precise positions for 4765-MHz OH maser emission sources toward star-forming regions which had been observed about seven months earlier with the Effelsberg 100-meter telescope. The observations were successful for K3-50, DR21EX, W75N, and W49A. No line was detected toward S255: this line had decreased to less than 5 per cent of the flux density observed only seven months earlier. The time-variability of the observed features during the past 30 years is summarised. In addition, to compare with the Effelsberg observations, the 4750-MHz and 4660-MHz lines were observed in W49A. These lines were found to originate primarily from an extended region which is distinguished as an exceptional collection of compact continuum components as well as by being the dynamical centre of the very powerful H_2 O outflow.

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