A PRELIMINARY CLASSIFICATION SCHEME FOR THE CENTRAL REGIONS OF LATE-TYPE GALAXIES

Details A PRELIMINARY CLASSIFICATION SCHEME FOR THE CENTRAL REGIONS OF LATE-TYPE GALAXIES A PRELIMINARY CLASSIFICATION SCHEME FOR THE CENTRAL REGIONS OF LATE-TYPE GALAXIES

1995-05-03

arxiv.org/abs/astro-ph/9505011v1

Astronomy and Astrophysics

Astrophysics

6 pages, uuencoded compressed Postscript, figures not included. Also available at http://www.dao.nrc.ca/DAO/SCIENCE/9509.html

Scientific paper

10.1086/117546

The large-scale prints in The Carnegie Atlas of Galaxies have been used to formulate a classification scheme for the central regions of late-type galaxies. Systems that exhibit small bright central bulges or disks (type CB) are found to be of earlier Hubble type and of higher luminosity than galaxies that do not contain nuclei (type NN). Galaxies containing nuclear bars, or exhibiting central regions that are resolved into individual stars and knots, and galaxies with semi-stellar nuclei, are seen to have characteristics that are intermediate between those of types CB and NN. The presence or absence of a nucleus appears to be a useful criterion for distinguishing between spiral galaxies and Magellanic irregulars.

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