A deep VLA search for OH (1612 MHz) maser sources in the galactic plane

Details A deep VLA search for OH (1612 MHz) maser sources in the galactic plane A deep VLA search for OH (1612 MHz) maser sources in the galactic plane

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..479b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 2, p. 479-492

Astronomy and Astrophysics

Astronomy

33

Asymptotic Giant Branch Stars, Interstellar Masers, Milky Way Galaxy, Radio Astronomy, Radio Observation, Radio Sources (Astronomy), Very Large Array (Vla), Astronomical Interferometry, Infrared Astronomy Satellite, Radio Spectra, Sky Surveys (Astronomy), Star Distribution, Velocity Distribution

Scientific paper

The results of a Very Large Array (VLA) OH (1612 MHz) search for OH/IR stars in 7 fields along the galactic plane are presented. Forty-four sources were detected of which 35 were not previously known. It is shown that 'blind' radio interferometric observ- ations (such as with the VLA) are capable of filling up the gap in the IRAS based OH surveys near the galactic plane. This is important for the dynamical modeling of the disc and bulge of our Galaxy. It is also demonstrated that the high resolution of a synthesis telescope is needed to avoid confusion in the galactic plane. Most detected sources are likely to be young (approximately less than 1 Gyr) and massive (Mms greater than 2-3 solar masses) evolved stars and have high expansion velocities (vexp greater than 14.5 km/s) and small deviations (less than 10 km/s) from galactic rotation. Like Baud et al. (1981) we find a peak in the number of sources around l = 25 deg, a region associated with active star formation and a low number of stars at l = 5 deg and 10 deg.

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