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The Nature of Ultraluminous Compact X-Ray Sources in Nearby Spiral Galaxies
Studies were made of ASCA spectra of seven ultraluminous compact X-ray sources in nearby spiral galaxies: M33 X-8, M81 X-6, IC 342 source 1, Dwingeloo 1 X-1, NGC 1313 source B, and two sources in NGC
Hard X-Ray Detector (HXD) on Board Suzaku
The Hard X-ray Detector (HXD) on board Suzaku covers a wide energy range from 10 keV to 600 keV by combination of silicon PIN diodes and GSO scintillators. The HXD is designed to achieve an extremely
The X-Ray Observatory Suzaku
High-sensitivity wide-band X-ray spectroscopy is the key feature of the Suzaku X-ray observatory, launched on 2005 July 10. This paper summarizes the spacecraft, in-orbit performance, operations, and
Evidence for a Black Hole in the X-Ray Transient GRS 1009-45
We report on the result of an X-ray observation of the X-ray Nova Velorum 1993 (GRS 1009—45), made with ASCA on 1993 November 10-11. The energy spectrum was extremely soft and accompanied by a hard
ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium
We analyzed the ASCA X-ray data of 40 nearby Clusters of galaxies, whose intracluster-medium temperature distributes in the range of 0.9-10 keV. We measured the Si and Fe abundances of the
Simultaneous X-ray and optical observations of GX 339-4 in an X-ray high state
Optical emission, soft X-rays, and hard X-rays have been observed simultaneously from the black hole candidate GX 3339-4 in a typical high state. Each of these components is interpreted as arising
ASCA Observation of an X-Ray/TeV Flare from the BL Lacertae Object Markarian 421
We observed the BL Lac object Mrk 421 with the X-ray satellite ASCA in 1994 as part of a multifrequency observation. The 24 hr observation was conducted 1 day after the onset of a TeV flare detected
White dwarf masses in intermediate polars observed with the Suzaku satellite
Context. White dwarfs (WDs) in cataclysmic variables (CVs) are important experimental laboratories where the electron degeneracy is taking place on a macroscopic scale. Magnetic CVs increase in
In-Orbit Performance of the Hard X-Ray Detector on Board Suzaku
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide energy bandpass of