The luminosity distributions of edge-on spiral and lenticular galaxies. II - Modelling the non-thin disc light in a sample of ten galaxies

Details The luminosity distributions of edge-on spiral and lenticular galaxies. II - Modelling the non-thin disc light in a sample of ten galaxies The luminosity distributions of edge-on spiral and lenticular galaxies. II - Modelling the non-thin disc light in a sample of ten galaxies

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242...59s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 1, 1990, p. 59-73. Research supported by SERC

Mathematics

Logic

50

Astronomical Photometry, Galactic Structure, Luminosity, Spiral Galaxies, Astronomical Models, Brightness Distribution, Charge Coupled Devices, Color, Least Squares Method

Scientific paper

We present the results of application of a least-squares modelling algorithm to the two-dimensional luminosity distributions of a new sample of ten edge-on spiral and lenticular galaxies. Significant differences are found in the statistically-defined best-fit model surface brightness distributions between galaxies of similar morphological type. The measured disc scaleheight is independent of radial distance to within +3 per cent of the mean value, indicating that galactic discs have constant thickness to high precision. The luminosity profiles of the non-thin disc components indicate a high degree of flattening (axial ratios <0.7) in all cases. We find no one-to-one correspondence between the presence of a significant central `bulge' and evidence for a multi-component structure within the non-thin disc light, and there is no correlation between the shape of the luminosity profiles of the non-thin disc light and the presence of companions. For those galaxies for which multi-colour photometry was available, no evidence was found of colour gradients perpendicular to the disc plane of any system.

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