Mid- and far-infrared observations of two compact HII regions and one compact CO clump

Details Mid- and far-infrared observations of two compact HII regions and one compact CO clump Mid- and far-infrared observations of two compact HII regions and one compact CO clump

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..775v&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 775

Computer Science

2

Compact Hii Regions, Molecular Clump, Pah

Scientific paper

Three compact HII regions molecular clumps (IRAS 19181+1349, 20286+4105 and 20178+4046) have been observed at mid infrared wavelengths using ISO and at far infrared wavelengths using the TIFR 1 m balloon-borne telescope. ISO observations have been made in seven spectral bands (3.3, 3.7, 6.0, 6.75, 9.6 and 11.4 μm) using the ISOCAM instrument. Four of these bands cover the emission from Polycyclic Aromatic Hydrocarbon (PAH) molecules. Far infrared observations have been made in two bands with effective wavelengths of ~130 and ~210 μm. In addition, IRAS survey data for these sources in the four IRAS bands have also been processed using the HIRES routine. There are structural similarities between the images in the mid infrared bands and the large scale maps in the far infrared bands despite very different angular resolutions of the two. A comparison of the flux densities in different ISO bands clearly shows the importance of the PAH emission. Spectral energy distributions for these sources have been constructed by combining data from all these observations. Radiation transfer calculations through dust cloud have been made to understand these spectral energy distributions as well as the infrared morphologies of these sources.

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