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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tadayuki Kodama, Nagayoshi Ohashi, Tomonori Usuda) by email : sseminar_at_subaru.naoj.org (please change"_at_" to @).

January 9, Wednesday, at 11:00 am

" SUZAKU meets SUBARU - Gas dynamics in galaxy clusters with SUZAKU and ASTRO-H "

Takayuki Tamura

(ISAS, JAXA)


Galaxy clusters are the largest and youngest gravitationally bound system among the hierarchical structures in the universe. Dynamical studies of clusters have revealed that some systems are still forming and unrelaxed. X-ray studies of velocity structures of the intracluster medium is one of the primary goals for future X-ray missions. High resolution spectroscopies will provide measurements of energy distributions not only in thermal but also in kinematic forms. We have demonstrated gas motions based on the Suzaku observations of a X-ray bright merging cluster, Abell2256, by detecting a motion of a sub component with a velocity of about 1500 km/s for the first time by X-ray. In addition, I will introduce our cluster project based on X-ray and gravitational lensing (Subaru) observations. This project provides comparison between X-ray and lensing mass estimates and hence probes dynamical state at cluster outer regions. Following Suzaku, Chandra, XMM-Newton and others, the next international X-ray mission, ASTRO-H, to be launched in 2014, will expand our understanding of the evolution of clusters and large scale structures. I will give some future prospects with the ASTRO-H.

[Reference]

- Tamura et al. 2011, http://adsabs.harvard.edu/abs/2011PASJ...63S1009T
- Sato et al. 2012, http://adsabs.harvard.edu/abs/2012PASJ...64...95S
- ASTRO-H web page, http://astro-h.isas.jaxa.jp/

Seminars are also held at JAC, CFHT, and IfA.



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