X-ray Signatures related to Energetic Electrons Escaping from the Sun: First HESSI results

X-ray Source Population in the Elliptical Galaxy NGC 720 as seen with Chandra

X-ray sources in clusters of galaxies

X-ray sources in regions of star formation. I - The naked T Tauri stars

X-ray sources in regions of star formation. IV - High-resolution optical spectroscopy of X-ray identified candidate pre-main-sequence stars in the Chamaeleon I cloud

X-ray sources in the 1hr XMM-Newton/Chandra deep field survey.

X-ray Sources in the Galaxy

X-ray sources near Lockman Hole (Zappacosta+, 2005)

X-ray Spectra and Variation of the Reflection Nebula of Eta Carinae

X-ray Spectra of Accreting Neutron Stars in the Atoll and Z Subclasses

X-ray spectra of the Crab pulsar and Nebula

X-ray spectra of X Persei

X-ray Spectral and Temporal Variability of an Illuminated Clumpy Disk around a Black Hole

X-ray spectral and variability modeling of low-frequency peaked BL Lac objects

X-ray Spectral Lines as Diagnostics of Neutron Star Masses, Radii, and Magnetic Fields

X-ray spectral microanalysis of composition of individual lunar regolith particles

X-Ray Spectral Study of a Newly Ginga-Detected DQ Her

X-ray Spectral Variability in the Seyfert 1 Galaxy Mrk 509

X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1

X-ray spectral variation of the Crab Nebula in arc-second scale