19
Spiral/Lenticular
Galaxies
•Light
Distribution
–Two
components, spheroid + disk
–Spheroid
is like a mini-elliptical right down to a de Vaucouleur’s
law distribution
–Exponential
disk component:
–Where
h is the disk scale length (3 kpc for the Milky Way), so total L
is then 4πr2Io.
