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Date and Time of the Query: 2019-06-25 T20:44:19 PDT
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For refcode 1988A&A...203..226S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...203..226S Brackett {gamma} observations and extinction in giant H II regions in M 101 E.D. Skillman and F.P. Israel Netherlands Foundation for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands Received December 17, 1987; accepted February 24, 1988 Summary. We have conducted Brackett {gamma} (Br {gamma}) spectrophotometry of four giant H II regions in M 101. The Br {gamma} fluxes have been compared with previously measured H{alpha}, H{beta}, and 5 GHz radio continuum fluxes in order to assess reddening and extinction. We find that the extinctions derived from comparing recombination line fluxes are always less than the extinctions derived from comparing recombination line fluxes to radio continuum fluxes, confirming previous observations of this effect. In addition, we find that the derived extinction increases with increasing comparison wavelength (using H{beta} as a baseline), but the sample of H II regions measured here is too small to be conclusive on this effect. Br {gamma} fluxes may be used to investigate the wavelength dependence of the albedo of the dust for measuring extinction. Our tentative conclusion is that this effect is not very important. The relevance of dust and extinction for the {sigma}-L relationship for giant extragalactic H II regions is discussed. Key words: interstellar medium: dust - extinction - H II regions - infrared radiation
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