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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 NGCExpand
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Gravitationally redshifted emission implying an accretion disk and massive black hole in the active galaxy MCG–6–30–15
ACTIVE galactic nuclei and quasars are probably powered by the accretion of gas onto a supermassive black hole at the centre of the host galaxy1, but direct confirmation of the presence of a blackExpand
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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 hardExpand
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Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
One of the advantages of the X-ray Imaging Spectrometer (XIS) system on board Suzaku is its low and stable non-X-ray background (NXB). In order to make the best use of this advantage, modeling theExpand
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Iron K Emission Lines in the Energy Spectra of Low-Mass X-Ray Binaries Observed with ASCA
ASCA archive data of 20 low-mass X-ray binaries (LMXBs) were analyzed to study the iron K emission lines. The LMXBs analyzed here include Z sources, atoll sources, dippers, bursters, and ADCExpand
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X-ray variability of GX 339 - 4 in its very high state
GX 339-4 was observed with the large area counters (LAC) onboard Ginga in its very high state, where the X-ray intensity was about a factor of 2-3 larger than its high state and it showed very rapidExpand
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The variable iron K emission line in MCG-6-30-15
We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG– 6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, andExpand
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The Hard X-ray Telescope (HXT) for the SOLAR-A mission
The Hard X-ray Telescope (HXT) is a Fourier-synthesis imager; a set of spatially-modulated photon count data are taken from 64 independent subcollimators and are Fourier-transformed into an image byExpand
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ASCA Observations of Soft X-Ray Transients in Quiescence : X1608-52 and CEN X-4
We observed soft X-ray transients, X1608-52 and Cen X-4, in quiescence with ASCA at X-ray luminosities on the order of 10^(32- 33) erg s^(-1).The energy spectra were rather soft for both sources.Expand
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