Accession Number : ADA264336


Title :   The 12 UM Contribution of Nearby Galaxies to the Infrared Background


Descriptive Note : Annual rept. 1 Oct 91-30 Sep 92,


Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF ASTRONOMY


Personal Author(s) : Thuan, Trinh X


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264336.pdf


Report Date : Apr 1993


Pagination or Media Count : 5


Abstract : The far infrared properties of normal non-infrared-bright galaxies were studied as a function of their morphological type using a sample of 1544 galaxies of magnitude less than 14.5. Most of the far infrared color trends as a function of galaxian morphological type can be reproduced by dust models with three components, combined with an appropriate dust heating spectral energy distribution. Work has been done on the use of far infrared luminosity as a star formation indicator in galaxies. The trends observed are consistent with a two- component model, with the citrus fraction as the second parameter and the star formation rate as the first parameter. Observations have been made and studies performed on dwarf and low surface brightness galaxies and starburst galaxies at intermediate red shifts.


Descriptors :   *FAR INFRARED RADIATION , *STARS , *GALAXIES , LUMINOSITY , MODELS , OBSERVATION , COLORS , SPECTRAL ENERGY DISTRIBUTION , INDICATORS , HEATING , ENERGY , DUST , BRIGHTNESS


Subject Categories : Astronomy
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE