Abstract
We analyze the r-band absolute magnitude and ur color of low-redshift (z < 0:06) galaxies in the Sloan Digital Sky Survey Data Release 6. Galaxies with nearly exponential profiles (Sloan parameter fracDeV < 0:1) fall on the blue sequence of the color-magnitude diagram; if, in addition, these exponential galaxies have Mr P � 19, they show a dependence of ur color on apparent axis ratio q expected for a dusty disk galaxy. We create a subsample of bright exponential galaxies, with typical Hubble types Sbc and Sc; then, by comparing the normalized luminosity functions for galaxies with different values ofq, we measure how the high-luminosity cutoff of the luminosity function depends on apparent axis ratio. In this way, we measure a dependence of dimming on apparent axis ratio well fit by the relation Mr ¼ 1:27(logq) 2 , rather than the M / logq law that is frequently assumed. When the absolute magnitudesof brightexponential galaxiesare corrected totheir ''face-on'' value,M f r ¼ MrMr, the averageur color is linearly dependent on M f
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