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Far-infrared spectra of W51-IRS 2 and W49 NW (1980)

Erickson, E. F. ; Tokunaga, A. T.

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Publication Date: 2011-08-17

Description: 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.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal; vol. 238

Format: text

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