Sources of Outflow in the Orion BN/KL Region

Details Sources of Outflow in the Orion BN/KL Region Sources of Outflow in the Orion BN/KL Region

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0719s&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #07.19; Bulletin of the American Astronomical Society, Vol. 29, p.1221

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present results of the first VLBA study of the 43 GHz SiO masers in the Orion BN/KL region. Maser spot positions have been measured with a characteristic accuracy of less than 0.5 AU. The distribution of the emission strongly suggests that the masers trace the walls of two opposing cones, as in a bipolar outflow from a central object. The flow is probably centered on a known radio continuum source in the region, and it is inclined to the line of sight, with the northwestern cone redshifted by about 20 kms(-1) with respect to the southeastern cone. Previous models of the region, based on observations with at least 500 times lower angular resolution attribute that maser features to a rotating and expanding disk. Nearby water masers may trace a warm dusty disk that is orthogonal to the bipolar outflow.

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