Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..111g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 111-120.
Astronomy and Astrophysics
Astronomy
18
Far Infrared Radiation, Galactic Nuclei, Infrared Astronomy, Spiral Galaxies, Astronomical Photometry, Balloon-Borne Instruments, Cosmic Dust, Infrared Astronomy Satellite, Infrared Telescopes
Scientific paper
The study reports observations of NGC 4945 and the Circinus galaxy carried out with a 1-m balloon-borne FIR telescope. Pointed observations of IRAS, using survey detectors, were deconvolved to get higher angular resolution intensity maps at 12, 25, 60, and 100 microns, respectively, for both galaxies. In NGC 4945, the nucleus was found to be cooler than its immediate surroundings. Whereas both galaxies show a prominent central source, only NGC 4945 shows extended disk emission in all bands. The central source in both galaxies was found to be somewhat more extended than a point source at wavelengths 50 microns or greater, the resulting deconvolved size being about 40 arcsec. The 150-micron upper limit for the Circinus galaxy implies a steeper wavelength dependence of dust emissivity than is the case for NGC 4945.
Bisht R. S.
Ghosh Sanjay K.
Iyengar V. K. K.
Rengarajan T. N.
Tandon Shyam N.
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