Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456...55o&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
4
Interstellar Dust, Unidentified Infrared Emission Bands, Hii Regions, Carina Nebula, S171, Ρ Oph
Scientific paper
Two Hii regions of the Carina nebula and Sharpless 171, and the ρ Oph cloud region have been mapped with PHT-S and LWS full grating scan. The spatial variation in the intensities of the unidentified infrared (UIR) emission bands is examined in relation to the intensity of far-infrared (FIR) emission, which comes from submicron dust grains. The strength of the radiation field was derived from the temperature of the FIR emission. We found that the intensity ratio UIR/FIR is almost constant for 1 < G0 < 103, where G0 is the strength of the incident radiation field in solar units. Furthermore, no systematic variation in the ratio is seen with the spectral type of the heating source (from O3 to B2 types). The ratio, however, shows an appreciable decrease in the ionized region or in the region of G0 > 1000. This may be attributed to the destruction of the UIR band carriers or the inefficient emission mechanism in the ionized region or in the strong radiation field. There may also be an indication that the UIR/FIR ratio increases at the surface of molecular gas in the observed regions, suggesting a possible increase in the abundance of the UIR band carriers. The relative band ratios of the UIRs do not show any systematic variation even at the regions where the decrease in the ratio is observed or at the regions where the enhancement in the ratio is suggested. This indicates that the UIR band carriers are quite stable species, providing an important clue to the understanding of the UIR band carriers and emission mechanism.
Chan Kai Wing
Doi Yasuo
Mizutani Masashi
Nakagawa Takao
Onaka Takashi
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