The Ages of Galaxy Bulges and Disks from Optical and Near Infrared Colours
For a sample of bright nearby early-type galaxies we have obtained surface photometry in bands ranging from U to K. Since the galaxies have inclinations larger than 50 deg. it is easy to separate bulges and disks. By measuring the colours in special regions, we minimize the effects of extinction, and by looking at B-K colour gradients we can show
Peletier, R. F. et al.
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1996