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High resolution infrared spectroscopy of W51-IRS2

Phillips, J. P.; White, Glenn J.; Richardson, K. J. and Williams, P. M. (1982). High resolution infrared spectroscopy of W51-IRS2. In: Galactic and Extragalactic Infrared Spectroscopy, 03-04 Dec 1981, Leiden, pp. 73–75.

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Spectra were obtained of W51-IRS2 in the wavelength ranges 2.95-3.5 μm, and 3.99-4.1 μm. These show the presence of the Pf epsilon and Br alpha recombination lines of HI, and the 3.28 μm narrow band emission feature. Sampling of Br alpha and the 3.28 μm 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 103 cm-3. For the 3.28 μm 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.

Item Type: Conference or Workshop Item
Copyright Holders: 1982 Not known
Keywords: emission spectra; excitation; galactic evolution; high resolution; infrared spectroscopy; oscillators; brightness temperature; dust; interstellar extinction; kinematics; spatial distribution
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 33792
Depositing User: G. J. White
Date Deposited: 07 Jun 2012 08:13
Last Modified: 07 Dec 2018 10:06
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