The Variable Warm Absorber in Circinus X-1
Norbert's paper on the faint-state observations of Cir X-1 has just been accepted to ApJ. While the P-Cygni lines (present in earlier observations when the source was brighter) were absent, we found evidence for complex absorption effects, including warm (moderately ionized) absorbers with varying column density. This Chandra observation has proved popular lately, with another paper analysing the same data posted just weeks earlier.
Read the paper arXiv:0709.3336