17
Luminosity Distributions -- Bulges
•
Elliptical galaxies have an apparently simple
structure, can be characterized by their luminosity
distribution.
Maximum in center, and falls off:
•
Hubble’s Law:
–
I/I
0
= [(r/a) + 1]
-2
•
•
De Vaucouleur’s r
1/4
Law:
–
Log (I/I
e
) = -3.33[(r/r
e
)
1/4
– 1]