Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..929l&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 929
Other
10
Infrared: Lines And Bands, Ism: General
Scientific paper
We report infrared spectra over wavelength ranges from 2.5 to 5 μm and from 6 to 11.6 μm on a sample of 45 disk galaxies whose bolometric luminosities are derived predominately from stellar sources. The vast majority of the sample spectra look ``alike'' and can be modelled by a set of emission features (EFs or UIR bands) including those at 6.2, 7.7, 8.6 and 11.3 μm and their associated emission plateaux, superposed on a low-level continuum that possibly extends to and mixes with a photospheric continuum at near-infrared (IR) wavelengths. These continua, which dominate the near-IR part of the spectrum, and the EFs, which dominate the mid-IR part, contribute about equally to the total spectral energy between 3 and 12 μm that in turn carries a luminosity equivalent to about 10% to 40% of the far-IR luminosity for a normal galaxy. From the most quiescent to the most active galaxies in the sample, we found (i) little systematic trend in the relative strengths of the mid-IR features, except for the 11.3 μm feature that could be depressed relative to the other features by up to a factor of 2 or so; and (ii) the ratio of the EF flux to the far-IR flux drops by about 60% on average.
Beichman Charles Arnold
Helou George
Lu Nanyao Y.
Malhotra Sagar
Rubin Robert H.
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