X-ray/optical classification of cluster mergers and the evolution of the cluster merger fraction

X-ray/optical contemporaneous observations of SS433.

X-ray/optical observations of A0535+26/HDE 245770 in quiescence

X-ray/optical observations of stars with shallow convection zones (A8-G2 V)

X-ray/optical observations of XTE J0421+560/CI Cam in quiescence

X-ray/Optical Variability of Akn 120 and 3C 120

X-ray/Optical/Radio Observations of a Resolved Supernova Remnant in NGC 6822

X-ray/TeV-gamma-ray observations of several strong flares of Mkn 501 during 1997 and implications

X-Ray/Ultraviolet Observing Campaign of the Markarian 279 Active Galactic Nucleus Outflow: a close look at the absorbing/emitting gas with Chandra-LETGS

X-ray/UV Campaign on the Mrk 279 AGN Outflow: Constraining Inhomogeneous Absorber Models

X-ray/UV campaign on the Mrk 279 outflow: density diagnostics in Active Galactic Nuclei using O V K-shell absorption lines

X-ray/UV Observing Campaign on the Mrk 279 AGN Outflow: A Global Fitting Analysis of the UV Absorption

X-ray/UV/Optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of July 2006

X-ray/VUV transmission gratings for astrophysical and laboratory applications

X-raying A Cold, Dark Dragon To Find A Hot, Glowing Heart

X-raying Abell 2125 -- a Large-scale Hierarchical Complex of Galaxies and Hot Gas

X-raying Active Galaxies Found and Missed by the Sloan Digital Sky Survey

X-raying Active Galaxies with the New Generation of X-ray Observatories: Ionized Outflows and High-Redshift Studies

X-raying Chemical Evolution and Galaxy Formation in The Antennae

X-raying clumped stellar winds