CfA Colloquium: May 8, 2003

Speaker: Chris Impey (U. Arizona)

Title: Qausars as Cosmological Probes

Abstract: Forty years after their discovery, one of the most powerful use of quasars is as high redshift probes of the intervening universe. Quasar absorption lines can be used to map out the IGM, trace the halos of high redshift galaxies, and survey the evolution and metal enrichment of galaxy disks. This talk will focus on what can be learned from studies of the Lyman-alpha forest, especially when information is combined from quasar pairs or groups that are closely separated on the sky.

Reference for students:
M. Rauch, 1998, Ann.Rev.Ast.Ap. 36, 267