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

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

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..679b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 15, 1987, p. 679-689.

Astronomy and Astrophysics

Astronomy

27

Astronomical Spectroscopy, H Ii Regions, Interstellar Masers, Molecular Clouds, Star Formation, Ammonia, Hydroxyl Radicals, Radio Spectra, Very Large Array (Vla)

Scientific paper

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 center of the molecular disk previously detected in NH3 and CS observations. The distribution of OH masers has the same elongation and position angle as the NH3 disk, but on a scale nearly 100 times smaller. VLA maps of the NH3 (3, 3) emission from the disk are also presented. These confirm the rotation of the disk and reveal asymmetries in its structure. The size of the NH3-emitting region decreases systematically with increasing excitation, which suggests central heating of the disk. 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 center of the disk 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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