Infrared line and continuum spatial studies of the southern H II region G333.6-0.2

Astronomy and Astrophysics – Astronomy

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Astronomical Maps, H Ii Regions, Infrared Spectra, Radio Sources (Astronomy), Astronomical Models, Continuous Spectra, Cosmic Dust, Electromagnetic Absorption, Hydrogen Ions, Line Spectra, Lyman Alpha Radiation

Scientific paper

High-spatial-resolution maps of G333.6-0.2 in both Ne II line and infrared continuum emission at 12.5 microns are presented. The distributions are remarkably similar showing a simple compact and nearly symmetric source. A model of the region is presented which satisfactorily accounts for the observed infrared spatial distributions and the radio observations, and indicates that a significant fraction of the dust heating arises from the absorption of Ly-alpha radiation. In the compact core the dust is depleted with respect to the gas by a factor of 100, and in the outer regions by a factor of 10, compared with the interstellar dust/gas ratio.

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