Warm Absorbers in Active Galactic Nuclei
arXiv:astro-ph/0202335
Abstract
Observations of warm absorbers provided new ways to study the nuclear environments of AGNs. I discuss basic properties of warm absorbers and early developments with ROSAT, ASCA and HST observations. I briefly touch upon recent advances made with Chandra and FUSE.
Invited review presented at the "Multicolour Universe" conference, held in Mumbai, India, Sept. 2001