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We report the results of an XMM-Newton observation of Sgr A East and its surroundings. The X-ray spectrum of Sgr A East is well represented with a two-temperature plasma model with temperatures of ∼1 and ∼4 keV. Only the iron abundance shows clear spatial variation; it concentrates in the core of Sgr A East. The derived plasma parameters suggest that Sgr A(More)
For next-generation optical networks, it is expected that transmission capacity will be increased by making high channel density and wide band WDM systems, and increasing data bitrate per wavelength channel. The high bitrate per channel system has great potential for cost reductions in comparison with wide broaden DWDM systems of the same transmission(More)
We report the discovery by XMM-Newton and Chandra of a hard extended X-ray source (XMM J174540−2904.5) associated with a compact non-thermal radio filament (the Sgr A-E ‘wisp’=1LC 359.888−0.086=G359.88−0.07), which is located within ∼ 4 arcmin of the Galactic Centre. The source position is also coincident with the peak of the molecular cloud, M −0.13−0.08(More)
In X-rays, the Galactic Centre (GC) Region appears as a complex of diffuse thermal and non-thermal X-ray emission intermixed with a population of luminous discrete sources. Here we present some new findings from the XMM-Newton GC survey, focusing particularly on Sgr A, Sgr A East, the Radio Arc region, and a newly discovered X-ray non-thermal filament.
To support larger telecommunications capacities, the speed of optical transmission is increasing apace, and coming transmission rates in excess of 160 Gbit/s raise hopes for all-optical signal processing technologies that make possible highspeed signal processing. Accordingly, as the clock signal source that is indispensable for signal processing, we have(More)
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