Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..180w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 180-186. Research support
Astronomy and Astrophysics
Astronomy
9
Astronomical Maps, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Maximum Entropy Method, Sky Surveys (Astronomy), Astronomical Models, Astronomical Photometry, Cosmic Dust, Emission Spectra, Image Processing, Temperature Distribution
Scientific paper
A maximum entropy method is used to map directly IRAS survey calibrated reconstructed detector data (CRDD) of W49A into a surface brightness image. Results are obtained for its morphology and flux densities which are consistent with previous work. The enhancement in resolution is up to a factor of 3-5 over the standard mapping techniques based on averaging of CRDD samples. This improved resolution obtained using MEM gives the IRAS data comparable resolution to earlier submillimeter data. It is suggested that the disk-shaped core of W49N, containing a ring of about 10 O stars with associated H II regions, consists of gas and dust, with dust grains at three characteristic temperatures - 12, 50 and 145 K. The hot dust is expected to lie in shells around each of the H II regions, with the warm dust in more extended envelopes, in turn shielding the cooler dust, which is spread throughout the disk.
Berry Scott D.
Robson Ian E.
Ward-Thompson Derek
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