H-Alpha Images of Classical Early-Type(Sa-Sab) Spirals

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The H-II regions in these galaxies are either small or are totally absent from the spiral arms. All H-II regions in classical early-type spirals have L(H-Alpha) < 10^39 ergs/s.This class of galaxies span a wide range in H-alpha luminosity and most of them appear to be morphologically undisturbed in the continuum image. The galaxies with lower H-alpha luminosity seem to have a nuclear emission spiral at the center, similar to the one observed at the center of M81.


NGC 1022

NGC 1350

NGC 1371

NGC 1398

NGC 1433

NGC 1617

NGC 2273

NGC 3169

NGC 3885

NGC 5728

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