8-13 micron spectrophotometry of galaxies. I - Galaxies with giant H II region nuclei

Details 8-13 micron spectrophotometry of galaxies. I - Galaxies with giant H II region nuclei 8-13 micron spectrophotometry of galaxies. I - Galaxies with giant H II region nuclei

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207...25p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 1, 1984, p. 25-33.

Astronomy and Astrophysics

Astronomy

61

Astronomical Spectroscopy, Galactic Nuclei, H Ii Regions, Infrared Astronomy, Spectrophotometry, Emission Spectra, Line Spectra, Neon, Silicates

Scientific paper

Spectra at 8 - 13 μm of five spiral galaxies with giant H II regions in their nuclei are presented. The spectra are remarkably similar in showing the [Ne II] 12.81 μm fine structure line accompanied by strong emission features at 8.65 and 11.25 μm. The latter features are commonly associated with solid state transitions on dust grains, and thus provide direct evidence that dust emission dominates the infrared radiation of these objects. The spectra of all five galaxies show a minimum near 10 μm, which in several cases probably contains a contribution from silicate absorption. Extinction values calculated from optical and infrared emission lines ratioed against Hβ indicate only moderate reddening (Av = 0 - 5 mag). In most of the galaxies, this is far less than the extinction derived from the depth of the minimum in the 8 - 13 μm spectra, even after applying a correction for the contributions from the strong emission features.

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