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Titolo:
Modeling far-infrared emission from the HII region S125
Autore:
Aannestad, PA; Emery, RJ;
Indirizzi:
Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 Phys & Astron, Tempe, AZ 85287 USA Rutherford Appleton Lab, Dept Space Sci, Didcot OX11 0QX, Oxon, England Rutherford Appleton Lab Didcot Oxon England OX11 0QX 1 0QX, Oxon, England
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 376, anno: 2001,
pagine: 1040 - 1053
SICI:
1432-0746(200109)376:3<1040:MFEFTH>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
STAR-FORMING REGIONS; H-II REGIONS; INTERSTELLAR GRAINS; PHOTODISSOCIATION REGIONS; OPTICAL-PROPERTIES; FRACTAL DIMENSION; CLOUD COMPLEX; DUST GRAINS; HYDROGEN; CARBON;
Keywords:
HII regions; ISM : individual objects : S125; ISM : dust, extinction; infrared : ISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Aannestad, PA Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 , Tempe, AZ 85287 USA
Citazione:
P.A. Aannestad e R.J. Emery, "Modeling far-infrared emission from the HII region S125", ASTRON ASTR, 376(3), 2001, pp. 1040-1053

Abstract

We present ISO-LWS 45-180 mum spectral observations at 17 positions in theHII 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 mum.

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Documento generato il 04/12/20 alle ore 12:40:26