Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356.1149b&link_type=abstract
Astronomy and Astrophysics, v.356, p.1149-1156 (2000)
Astronomy and Astrophysics
Astrophysics
13
Radiation Mechanisms: Thermal, Ism: H Ii Regions, Infrared: Ism: Continuum, Radio Continuum: General, Radio Continuum: Ism
Scientific paper
The contribution of free-free and recombination radiation to the IR emission from regions of massive star formation is investigated. A method for calculating Gaunt factors for free-free emission from a hydrogenic non-relativistic gas is employed and the results are compared with approximation formula from the literature. While the cooling of ionized star forming regions due to free-free and free-bound transitions emerges in the MIR, which is dominated by dust emission, the overall cooling is mainly provided by line emission of heavier elements. Only in metal-free and therefore dust-free H ii regions can free-free and free-bound radiation become dominant. We investigate the global energy balance of those regions and determine temperatures of the ionized gas, which are in general 2 to 8 times larger than found in present day star forming regions of massive stars.
Beckert Th.
Duschl Wolfgang J.
Mezger Peter G.
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