High resolution infrared spectroscopy of W51-IRS2

Details High resolution infrared spectroscopy of W51-IRS2 High resolution infrared spectroscopy of W51-IRS2

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.192...73p&link_type=abstract

In ESA Galactic and Extragalactic Infrared Spectroscopy p 73-75 (SEE N83-18593 08-88)

Physics

Emission Spectra, Excitation, Galactic Evolution, High Resolution, Infrared Spectroscopy, Oscillators, Brightness Temperature, Dust, Interstellar Extinction, Kinematics, Spatial Distribution

Scientific paper

Spectra were obtained of W51-IRS2 in the wavelength ranges 2.95-3.5 microns, and 3.99-4.1 microns. These show the presence of the Pf epsilon and Br alpha recombination lines of HI, and the 3.28 microns narrow band emission feature. Sampling of Br alpha and the 3.28 microns feature northwards of IRS-2 shows emission to be in both cases extended over radial distances 20 arc seconds. In the case of Br alpha, we interpret this to arise in a blister region of density or approximately 10 to the 3rd power/cu cm. For the 3.28 microns feature, we demonstrate that observed band strengths are consistent with the Dweck et al. (1980) hypothesis of thermal excitation, providing that the oscillators responsible for this emissions are located within one extinction optical depth of the HI/HII interface.

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