X-ray absorption in the strong FeII narrow-line Seyfert 1 galaxy Mrk 507

X-ray Absorption Line Diagnostics of Quasar Outflows

X-ray Absorption Line Spectroscopy of the Galactic Hot Interstellar Medium

X-ray absorption lines in the Seyfert 1 galaxy NGC 5548 discovered with Chandra-LETGS

X-ray absorption lines suggest matter infalling onto the central black-hole of Mrk 509

X-ray Absorption Spectroscopy of the Multi-phase Interstellar Medium: Oxygen and Neon Abundances

X-ray Absorption Toward Abell 2029 due to a Foreground Spiral

X-ray Absorption Towards The Einstein Ring Source PKS1830-211

X-ray absorption via K-alpha resonance complexes in oxygen ions

X-ray absorption, interstellar reddening, and elemental abundances in the interstellar medium

X-ray accretion signatures in the close CTTS binary V4046 Sgr

X-ray active galactic nuclei in the core of the Perseus cluster

X-ray Activity and Accretion in Young Stellar Objects

X-ray activity and evolutionary status of late-type giants

X-ray activity and rotation of the young stars in IC 348

X-ray activity cycles in stellar coronae

X-ray activity in T-Tauri stellar magnetospheres

X-ray activity phased with planet motion in HD 189733?

X-ray afterglow detection of the short gamma-ray burst 991014

X-ray afterglow from GRB011211 as observed with XMM-Newton.