High Resolution IR Observations of W28A2

Details High Resolution IR Observations of W28A2 High Resolution IR Observations of W28A2

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3414h&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #34.14; Bulletin of the American Astronomical Society, Vol. 25, p.850

Astronomy and Astrophysics

Astronomy

1

Scientific paper

W28A2 (G05.89-0.2) is a very compact H II region associated with an extremely energetic bipolar outflow. High angular resolution far-ir observations from NASA's KAO reported by Lester et al. (1987; BAAS, 19, 1016) showed that the dust around this H II region is optically thick in the far-ir. We have re-observed W28A2 with a new, high resolution far-ir radiometer on the KAO as well as obtained 1 -- 4microns imaging at NASA's IRTF. The far-ir data confirm the fact that the 50 and 100microns emission is unresolved and optically thick. The near-ir imaging reveals a bipolar structure, possibly reflection nebulosity, at the shorter wavelengths, and a compact source at 3.8microns with a morphology much like that seen at 10microns. Radiative transfer modeling of the source shows that a relatively steep dust density gradient is required, rho ~ r(-n) , with n ~ 3 -- 5. The near-ir morphology is consistent with the presence of a dense disk, suggested also by the existence of a strong bipolar outflow.

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