Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376.1040a&link_type=abstract
Astronomy and Astrophysics, v.376, p.1040-1053 (2001)
Astronomy and Astrophysics
Astrophysics
8
Hii Regions, Ism: Individual Objects: S125, Ism: Dust, Extinction, Infrared: Ism
Scientific paper
We present ISO-LWS 45-180 mu m spectral observations at 17 positions in the HII region S125. We model, as one integrated region, the far-IR continuum emission as well as the observed emissions in the radio continuum and in the 21 cm line, comparing two different model density distributions and several silicate-carbon dust models. The dust in the HII region is found to be severely depleted, while the dust in the PDR region has a normal dust/gas ratio, but with a major fraction of the mass in the form of the very small dust grains. Silicate-carbon dust must have strongly enhanced far-IR emissivities to be consistent with the observed spectra. It is found that the ionizing star alone does not power the infrared luminosity, but that additional sources of far-IR radiation must be present in a ring-like region surrounding the HII region. In this region the star accounts for about 50% of the observed emission. For most positions, the additional emission peaks at a wavelength around 70 mu m.
Aannestad Per A.
Emery Roger J.
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