Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..544w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 20, 1990, p. 544-548.
Astronomy and Astrophysics
Astronomy
16
H Ii Regions, Infrared Sources (Astronomy), Molecular Clouds, Star Formation, Astronomical Photometry, Infrared Astronomy, Nebulae, Polarimetry
Scientific paper
High spatial resolution 2.2-micron images and imaging polarimetry of the young bipolar outflow source G35.2N are presented which show that a thin disk (0.01 pc) bisects the two lobes and funnels the outflow. The bright IR source on the outflow (IRS 1) is not the exciting star of the region but is shown to be highly polarized extended reflection nebulosity. The polarization map locates the exciting star in the center of the molecular disk between the bipolar lobes. A scenario alternative to that of Dent et al. (1985) is proposed, whereby a large-scale interstellar disk is responsible for collimating the CO outflow, and the observed IR nebula is the NW and SE limb-brightened cavity wall, with the NE and SW cavity wall being partially obscured from view by intervening material. It is proposed that the B0.5 star thought to be at the center of the outflow does not emit enough K flux to illuminate the nebula; therefore, it is suggested that the disk contributes the difference.
Aspin Colin
McLean Ian S.
Walther Dolores M.
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