Astro 1050     Fri. Mar 26, 2004

The Galactic Rotation Curve

Stellar Population and Galaxy Evolution

Traditional Model of Galaxy Evolution

M51:  The Whirlpool Galaxy

Possible Origin of Spiral Arms

Degree of Organization
 of the Spiral Arms

Degree of Organization
 of the Spiral Arms

Tracing the Spiral Arms

M51:  The Whirlpool Galaxy

Density Wave Theory

Self Sustaining Star Formation

Two limiting cases of spirals

The Nucleus of the Galaxy

A movie of stars at the core