Assignment #6:

• Due Apr. 27 (Wednesday) at the beginning of class.

Problems:

• Carroll & Ostlie: 28.4, 28.5i 28.5ii, 28.6, 28.9, 28.12i, 28.12ii, 25.15i, 25.15ii.
• Supplemental 1: Give 4 observational pieces of evidence for the existence of DM. Solution.
• Supplemental 2: calculate the Einstein radius for a 10¹² solar mass point mass lens at z=0.2, for a source galaxy at z=1. Solution.