Kosuke Sato

Suzaku measurement of Abell 2204's intracluster gas temperature profile out to 1800 kpc

Context. Measurements of intracluster gas temperatures out to large radii, where much of the galaxy cluster mass resides, are important for using clusters for precision cosmology and for studies of cluster physics. Previous attempts to measure robust temperatures at cluster virial radii have failed. Aims. The goal of this work is to measure the temperature profile of the very relaxed symmetric galaxy cluster Abell 2204 out to large radii, possibly reaching the virial radius. Methods. Taking advantage of its low particle background due to its low-Earth orbit, Suzaku u2000data are used to measure the outer temperature profile of Abell 2204. These data are combined with Chandra u2000and XMM-Newton u2000data of the same cluster to make the connection to the inner regions, unresolved by Suzaku , and to determine the smearing due to Suzaku s point spread function. Results. The temperature profile of Abell 2204 is determined from ~10xa0kpc to ~1800xa0kpc, close to an estimate of r 200 (the approximation to the virial radius). The temperature rises steeply from below 4xa0keV in the very center up to more than 8xa0keV in the intermediate range and then decreases again to about 4xa0keV at the largest radii. Varying the measured particle background normalization artificially by ± 10% does not change the results significantly. Several additional systematic effects are quantified, e.g., those due to the point spread function and astrophysical fore- and backgrounds. Predictions for outer temperature profiles based on hydrodynamic simulations show good agreement. In particular, we find the observed temperature profile to be slightly steeper but consistent with a drop of a factor of 0.6 from 0.3 r 200 to r 200 , as predicted by simulations. Conclusions. Intracluster gas temperature measurements up to r 200 seem feasible with Suzaku , after a careful analysis of the different background components and the effects of the point spread function. Such measurements now need to be performed for a statistical sample of clusters. The result obtained here indicates that numerical simulations capture the intracluster gas physics well in cluster outskirts.

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

Cooling system for the soft x-ray spectrometer (SXS) onboard ASTRO-H

1times 10^{-14}

Activation of post-synaptic dopamine D1 receptors promotes the release of tissue plasminogen activator in the nucleus accumbens via PKA signaling

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,

The X‐Ray Microcalorimeter Spectrometer for the International X‐Ray Observatory

r_{200}

XMM-Newton Observation of IC 310 in the Outer Region of the Perseus Cluster of Galaxies

. Our entropy profile in the outer region (

Present performance of a single pixel Ti/Au bilayer TES calorimeter

> 0.5 r_{200}

X-Ray Halo around the Spiral Galaxy NGC 4631 Observed with Suzaku

) 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

Metallicity of the Fossil Group NGC 1550 Observed with Suzaku

7.5times10^{14}M_{odot}

Development of a microcalorimeter array for the Diffuse-Intergalactic Oxygen-Surveyor (DIOS) mission

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