Far-infrared spectra of W51-IRS 2 and W49 NW

Details Far-infrared spectra of W51-IRS 2 and W49 NW Far-infrared spectra of W51-IRS 2 and W49 NW

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..596e&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 596-600.

Astronomy and Astrophysics

Astronomy

33

Far Infrared Radiation, Infrared Astronomy, Nebulae, Radio Sources (Astronomy), Black Body Radiation, Early Stars, Emission Spectra, H Ii Regions, Infrared Spectra, Line Spectra, Michelson Interferometers

Scientific paper

Measurements of the far-infrared spectra of the powerful H II regions W51-IRS 2 and W49 NW from 65 to 345 per cm with about 9 per cm resolution were obtained by using an airborne Michelson interferometer. The most remarkable feature of the far-infrared spectra of the two regions is the smoothness of the continuum; no evidence is found in the spectra for features of H2O ice at 45 and 62 microns. The spectrum of W51 is well fitted by a 70 K blackbody with a diameter of 14 arc sec, but the spectrum of W49 NW is narrower than a blackbody. The implications of the apparently high peak optical depths of these sources are discussed.

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