The Diverse Nature of Early-type Spirals

Details The Diverse Nature of Early-type Spirals The Diverse Nature of Early-type Spirals

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.6604h&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #66.04; Bulletin of the American Astronomical Society, Vol. 30, p.914

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Scientific paper

The Diverse Nature of Early-type Spirals Preliminary results of an on-going Hα imaging survey of nearby, bright, early-type (Sa-Sab) spirals has revealed them to be a heterogeneous class of galaxies.The Hα images indicate that early-type spirals can be divided into two broad categories based on the Hα luminosity of the largest H-II region in the disk. The first category includes galaxies for which the individual H-II regions have Hα luminosity, L_{Hα } < 10(39}ergs({-1)) . Previously it was thought that all H-II regions in early-type spirals have L_{Hα } < 10(39) ergs(-1) , but our new observations have revealed that some early-type spirals host giant H-II regions that rival the most luminous giant H-II regions in late-type spirals. Most of the category 1 galaxies appear morphologically undisturbed. Despite the similarities in the continuum images, category 1 galaxies exhibit diverse nuclear properties. The early-type spirals with the lowest Hα luminosities host nuclear emission spirals whereas the galaxies that have the highest Hα luminosities host nuclear starbursts. Category 2 galaxies include those which have at least one H-II region in the disk with L_{Hα } 10(39}ergs({-1)) . Dust lanes and tidal tails are present in the continuum images of all category 2 galaxies suggesting a recent interaction, which may also explain the presence of giant H-II regions in these galaxies.

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