•Roberts
& Haynes 1994:
–Masses from S0 to Scd roughly constant, then
decrease, and M/L roughly the same – more next
chapter (3)
–H I not significant in ellipticals (< 1 in
10000), but is in spirals (0.01 to 0.15 from Sa to Sm)
(see Ch. 2)
–Total surface density decreases, H I surface
density increases
–Ellipticals
are red, spirals are blue…
–H II regions frequency increases monotonically
along the sequence (Kennicutt et al. 1989)
•Star
formation rates appear key to these relations
•
•