Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..111m&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Physics
3
Galactic Center, Ism, Shock Waves
Scientific paper
We present LWS and SWS ISO observations of 18 molecular clouds in the Galactic center (GC) region. Towards most of the clouds we have detected emission from the fine structure lines of ionized species like SIII and NeII, and in some cases also from NeIII, NII, NIII and OIII. The effective temperature of the ionization radiation derived from the NeIII/NeII, NIII/NII and SIII/OIII line ratios is 34.000-37.000 K, (typical of an O7 star). These ISO data when combined with the upper limits to the intensities of the recombination lines measured at millimeter wavelengths indicate that the UV radiation is very diluted. Cavities with sizes larger than 2 pc surrounding the ionizing star(s) are required to explain the dilution. The origin of the ionized cavities and the implications of these findings on the heating of the molecular clouds in the GC are discussed.
de Vicente P.
Fuente Asuncion
Hüttemeister S. H.
Kunze D.
Martín-Pintado J.}
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