Noriaki Tawa

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 the NXB spectra with high accuracy is important to subtract them from the spectra of on-source observations. We construct an NXB database by collecting XIS events when the dark Earth covers the XIS FOV. The total exposure time of the NXB data is about 785 ks for each XIS. It is found that the count rate of the NXB anti-correlates with the cut-off-rigidity and correlates with the count rate of the PIN upper discriminator (PIN-UD) in Hard X-ray Detector on board Suzaku. We thus model the NXB spectrum for a given on-source observation by employing either of these parameters and obtain a better reproducibility of the NXB for the model with PIN-UD than that with the cut-off-rigidity. The reproducibility of the NXB model with PIN-UD is 4.55-5.63% for each XIS NXB in the 1-7 keV band and 2.79-4.36% for each XIS NXB in the 5-12 keV band for each 5 ks exposure of the NXB data. This NXB reproducibility is much smaller than the spatial fluctuation of the cosmic X-ray background in the 1-7 keV band, and is almost comparable to that in the 5-12 keV band.

X-ray temperature and mass measurements to the virial radius of abell 1413 with suzaku

We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A1413 with Suzaku, whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions. We excise 15 point sources superimposed on the image above a flux of

High Metallicity of the X-Ray Gas Up to the Virial Radius of a Binary Cluster of Galaxies : Evidence of Galactic Superwinds at High-Redshift

1\times 10^{-14}

The background properties of Suzaku/XIS

\fluxunit (2--10keV) using XMM-Newton and Suzaku images of the cluster. We quantify all known systematic errors as part of our analysis, and show our statistical errors encompasses them for the most part. Our results extend previous measurements with Chandra and XMM-Newton, and show a significant temperature drop to about 3keV at the virial radius,

Characterization of a Hard X-ray Telescope at Synchrotron Facility SPring-8

r_{200}

Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku

. Our entropy profile in the outer region (

X-Ray Responsivities of Direct-Scintillator-Deposited Charge-Coupled Device

> 0.5 r_{200}

High resolution X-ray photon-counting detector with scintillator-deposited charge-coupled device

) joins smoothly onto that of XMM-Newton, and shows a flatter slope compared with simple models, similar to a few other clusters observed at the virial radius. The integrated mass of the cluster at the virial radius is approximately

Spectral capability evaluation of thick needlelike CsI(Tl) for scintillator directly coupled charge-coupled device

7.5\times10^{14}M_{\odot}

Discovery of an overlapping cluster in the Abell 1674 field with Suzaku

and varies by about 30% depending on the particular method used to measure it.