Galaxy Formation and Evolution

Questions:

1. What might we expect galaxies to look like in the early universe? How would they be the same or different from present day galaxies?

2. How and why might galaxies evolve over time?

Simulations of Galaxy Formation (courtesy Matthias Steinmetz) warning: these are big files....

• Spiral
• Elliptical
  

Observations of high redshift galaxies

High redshift quasars at z=1,2,3,4,5,6,?? -- what time is it? galaxies around a radio galaxy at z=1.2

The Hubble Deep Field HST stares at a "blank" spot of the sky for 10 days and sees this closeup of HDF galaxies the Hubble Ultra Deep Field

Evolution in cluster galaxies

• transformation of galaxies (S -> S0, maybe S -> E)
• truncation of star formation (why? gas stripping? gas depletion?)
  

z ~ 0.5	z ~ 0.0