Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394..104e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. 104-116.
Astronomy and Astrophysics
Astronomy
10
Cosmic Dust, Emission Spectra, Galactic Structure, Infrared Astronomy, Spiral Galaxies, Astronomical Models, Brightness Distribution, Far Infrared Radiation, Infrared Spectroscopy, Luminosity, Star Formation
Scientific paper
Observations of NGC 4565 at 100, 160, and 200 microns with the University of Chicago Far-Infrared Camera and the NASA-Kuiper Airborne Observatory are reported. In order to examine the dependence of FIR emission on spiral structure and star formation activity, these observations of NGC 4565, a quiescent Sb galaxy, are compared with observations of NGC 6946, an active Sc galaxy, made by Engargiola (1991) using the same instruments. Warm dust (30 K) in a bisymmetric spiral pattern superposed on an exponential disk of cool dust (20 K) can account for the FIR morphology of NGC 4565. Optical and IR data suggest that there are more embedded sources heating dust locally in the southeast arm region and more UV radiation from unobscured young stellar associations heating the cool, neutral medium in the northeast arm region.
Engargiola Greg
Harper Doyal A.
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