Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..743g&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 743-748. Research supported by the Alfred P. Sloan Foundation
Astronomy and Astrophysics
Astrophysics
20
Astronomical Photometry, Elliptical Galaxies, Galactic Structure, Luminous Intensity, Visual Photometry, Brightness, Color, Galactic Clusters, Signal To Noise Ratios, Statistical Distributions
Scientific paper
B - V color profiles to low surface brightness are presented for the normal giant elliptical galaxies NGC 4472 and NGC 5846 and the cD galaxy NGC 6166. Compared to the ellipticals, the cD shows a larger gradient and a somewhat bluer outermost envelope. This behavior would seem most consistent with models for cD formation in which the extended halo is either captured tidal debris torn from the outer regions of cluster members during high-velocity encounters or the remains of lower-luminosity galaxies. Although the present small sample and the limited accuracy of measurement do not warrant firm conclusions, color profiles of cD galaxies seem a promising attack on the problem of cD origin.
Burstein David
Faber Sandra M.
Gallagher Jay S.
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