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Are galaxy discs optically thick?

Disney, Michael John, Davies, Jonathan and Phillipps, S. 1989. Are galaxy discs optically thick? Monthly Notices of the Royal Astronomical Society 239 (3) , pp. 939-976. 10.1093/mnras/239.3.939

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Optical Thickness, Spiral Galaxies, Astronomical Models, Brightness Distribution, Gas Density, Infrared Astronomy Satellite, Mass To Light Ratios, Surface Propertie
Publisher: Oxford University Press
ISSN: 0035-8711
Last Modified: 04 Jun 2017 08:29

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