MERLIN and VLA observations of the star-forming region G35.2-0.7N

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Abstract
MERLIN observations are presented of OH 1665-MHz masers associated with the bipolar outflow source G35.2–0.7N. The masers are located in a region of expansion near the centre of the molecular disc previously detected in NH3 and CS observations. The distribution of OH masers has the same elongation and position angle as the NH3 disc, but on a scale nearly 100 times smaller. VLA maps of the NH3 (3, 3) emission from the disc are also presented. These confirm the rotation of the disc and reveal asymmetries in its structure. The size of the NH3-emitting region decreases systematically with increasing excitation, which suggests central heating of the disc. The OH masers coincide with a newly-detected compact H II region which lies midway between the two previously known H II regions in G35.2 – 0.7N, close to the geometrical centre of the disc and the bipolar outflow. The central star is the most likely source of the bipolar outflow. The radio continuum data imply a star of type B0.5 ZAMS, which is consistent with earlier estimates from infrared observations.

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