Are galaxy discs optically thick?

Details Are galaxy discs optically thick? Are galaxy discs optically thick?

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..939d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 15, 1989, p. 939-976.

Astronomy and Astrophysics

Astronomy

252

Optical Thickness, Spiral Galaxies, Astronomical Models, Brightness Distribution, Gas Density, Infrared Astronomy Satellite, Mass To Light Ratios, Surface Properties

Scientific paper

The classical optical evidence for the low optical depths traditionally assigned to spiral disks is reexamined, suggesting that it is highly model-dependent and unconvincing. In particular, layered models with a physically thin but optically thick dust layer behave like optically thin disks. The opposite hypothesis, that such disks are optically thick is then examined in the light of modern evidence. It is found to be consistent with the near IR and IRAS observations, with the surface brightnesses, with the H I and CO column densities and with the H-alpha measurements.

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