X-ray Shadowing Experiments Toward Infrared Dark Clouds

X-ray Spectral Variations in the Youngest Galactic Supernova Remnant G1.9+0.3

X-ray spectroscopy of the hot has in the M31 bulge

X-ray variability of AGNs in the soft and the hard X-ray bands

X-raying Galaxies: A Chandra Legacy

X-rays from Blue Compact Dwarf Galaxies

X-rays from the Power Sources of the Cepheus A Star-Forming Region

X-Shooter GTO: Chemical analysis of a sample of EMP candidates

X-shooter observations of main sequence stars in the globular cluster NGC 2808: first chemical tagging of a He-normal and a He-rich dwarf

XHIP-II: Clusters and associations

XHIP: An Extended Hipparcos Compilation

XMM-Newton investigations of the Lambda Orionis star-forming region (XILO). I. The young cluster Collinder 69

XMM-Newton observation of 4U 1820-30: Broad band spectrum and the contribution of the cold interstellar medium

XSL: The X-Shooter Spectral Library