Hard X-Ray Investigation of the Galactic Center Region with Suzaku(Chapter 5. The Galactic Center and Ridge Emissions, The Extreme Universe in the Suzaku Era)

概要

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The Galactic center (GC) region has been known to exhibit strong enhancements of hot diffuse plasma, which is characterized by the highly ionized Fe-K fluorescence line. Based on past X-ray observations with Ginga, ASCA, and RXTE, in the Galactic plane or bulge region, a non-thermal emission, so-called the "hard-tail", has been confirmed to dominate the hard X-ray flux above 10keV, and an association was found between surface brightnesses of the thermal and non-thermal components despite the completely different emission mechanism. Therefore, it is obviously important to investigate an existence of the hard-tail at GC with the unprecedented sensitivity of the HXD onboard Suzaku. By combining its narrow field-of-view of 30' and X-ray images simultaneously obtained by the XIS below 10keV, an extensive investigation of spectral and spatial properties of the GC hard X-ray emission can be for the first time realized. We will report on results from seven pointings around GC, with a total exposure of 300ks, performed in the performance verification phase of Suzaku. Strong hard X-ray signals were clearly detected in every observation by HXD-PIN in 10-70keV range with a few tenth mCrab level intensities.
理論物理学刊行会の論文
2007-12-19