Profiles of optically thick galaxies

Phillipps, S., Evans, R., Davies, Jonathan Ivor and Disney, Michael John 1991. Profiles of optically thick galaxies. Monthly Notices of the Royal Astronomical Society 253 , pp. 496-504.

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Abstract

The expected optical depths of the central regions of optically thick galaxies are determined as a function of radius for five galaxies with well-observed radial gas distributions in order to gain an insight into the dramatic optical depth effects on luminosity profiles. It is found that in all cases examined, which include galaxies with a wide range of ISM densities, the extrapolated central surface brightnesses of the disks are brightened by about 0.8 mag. Galaxies with Type II luminosity profiles, i.e., those with a dip or shoulder near the center, relative to the inward extrapolation of the outer disk component, have 'normal' bulge plus disk profiles after the absorption corrections are applied. As a check on this 'missing light', a comparison with profiles obtained from IRAS data is presented. In all cases there is an excellent correspondence between the light lost from the B band, as predicted by the present optically thick disk models, and that reemitted in the far infrared.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	disk galaxies, galactic structure, luminosity, optical thickness, cosmic dust, far infrared radiation, infrared astronomy satellite, interstellar gas
Publisher:	Wiley
ISSN:	0035-8711
Last Modified:	04 Jun 2017 04:26
URI:	https://orca.cardiff.ac.uk/id/eprint/39094

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