Characteristics of Galaxies
Classification: The Hubble Tuning Fork
Elliptical: E0--E7 Spheroids, E0 is spherical, E7 least spherical.
Population II stars, little dust, almost no star
formation.
Normal Spirals: Sa, Sb, Sc Sa is most tightly wound, Sc least.
Population I
stars in disk, Pop. II in nucleus. Dust and star
formation in
disk.
Barred Spirals: Sba, Sbb, Sbc Have bars across nucleus, Same
winding rules
as normal spirals. Same content as
normal.
Irregulars: No definite shape. Ex. Large and small Magellanic
clouds. Dominate universe by number, although
generally
smaller. Star formation, but less dust than
disks.
Peculiar: (Pec) Have a definite form, but with peculiarities.
Radio jets or
other strangeness.