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High angular resolution far-infrared observations of Sagittarius B2
Goldsmith, Paul F.; Lis, Dariusz C.; Lester, D. F.; Harvey, P. M.
AA(Five College Radio Astronomy Observatory, Amherst, MA), AB(Five College Radio Astronomy Observatory, Amherst, MA; California Institute of Technology, Pasadena), AC(Texas, University, Austin), AD(Texas, University, Austin)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 10, 1992, p. 338-346. (ApJ Homepage)
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NASA/STI Keywords:
Far Infrared Radiation, Infrared Astronomy, Infrared Sources (Astronomy), Molecular Clouds, Angular Resolution, Astronomical Maps, Maximum Entropy Method
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High-angular-resolution FIR observations of the continuum emission from the Sagittarius B2 molecular cloud core are reported. Evidence is found for a significantly spatially extended component of the FIR emission at 50- and 100-micron wavelength, which has an angular extent of 1 x 2 arcmin. Its approximate spatial coincidence with a low-level extended component of the radio free-free emission and with the portion of the SGR B2 core having densities not less than 10 exp 5 cu cm derived from molecular observations suggests that the ionizing radiation from the massive stars in the compact sources is diffusing through a region with a beam-averaged visual extinction not less than a few hundred mag. It is inferred that the gas and the dust in the central portion of the cloud surrounding the compact radio free-free/FIR sources are highly clumped.

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