X線で探る宇宙の大規模構造と暗黒物質

https://sites.google.com/site/auescicolo/

X線で探る宇宙の大規模構造と暗黒物質
Time：６月２０日（金）１７：００-

Place：自然科学棟４階４０１号室

Speaker：田村隆幸氏
Affiliation：宇宙科学研究所　学際科学研究系

Abstract：

宇宙には、星、銀河、銀河団という階層構造があります。
宇宙で最大の力学系といわれる銀河団には、星に加えてX線を放射する高温のプラズマガスが存在します。さらに、星とガスの総量の10倍近い未知の物質（暗黒物質）が存在することもわかってきました。X線による銀河団の観測によって、このプラズマの中に大量の金属が含まれていることが発見されました。また、プラズマの圧力分布や運動から暗黒物質の分布を調べることができます。このような観測について、「すざく」衛星を用いた最近の結果と2015年に打ち上げる予定のASTRO-H衛星への期待とを紹介します。

セミナー資料(PDF)

Suzaku-MAXI 2014

http://wwwxray.ess.sci.osaka-u.ac.jp/SuzakuMAXI2014/

My talk:
X-ray measurements of gas bulk motions in galaxy clusters

X-ray studies of velocity structures of the intracluster medium is one of the primary goals for future X-ray missions. High resolution spectroscopy will provide measurements of energy distributions not only in thermal but also in kinematic forms. These provide understanding of cluster formation and reductions of systematic uncertainties in cluster total masses for precise cosmology. Using Suzaku we have detected a motion of a sub component with a velocity of about 1500 km/s for the first time by X-ray of a X-ray bright merging cluster, Abell2256 (Tamura et al. 2011). We also detected a hint of bulk motion in the Perseus cluster core (Tamura et al. 2013). In addition we attempted to measure 'X-ray gas redshift' of clusters. We found that gas are moving in pair with galaxies at least in X-ray bright central regions. In addition to these new Suzaku results, future studies of gas bulk motion along with turbulent motions by X-ray micro calorimeter onboard ASTRO-H will be discussed.

X-ray measurements of cluster gas bulk motions

Talk in Alpine cosmology workshop

2013-06-25

abstract:
X-ray studies of velocity structures of the intracluster medium is one of the primary goals for future X-ray missions.
High resolution spectroscopy will provide measurements of energy distributions not only in thermal but also in kinematic forms.
These provide not only to understanding of cluster formation but also reductions of systematic uncertainties in cluster total masses for precise cosmology.
Using Suzaku we have detected a motion of a sub component with a velocity of about 1500 km/s for the first time by X-ray of a X-ray bright merging cluster, Abell2256 (Tamura et al. 2011).
We also searched for gas bulk motions in relaxed clusters such as the Perseus.
In addition we attempt to measure 'X-ray gas redshift' of clusters.
We found that gas are moving in pair with galaxies at least in X-ray bright central regions.
Studies of gas bulk motion along with turbulent motions will be drastically advanced by X-ray micro calorimeter onboard ASTRO-H to be launched in 2015. We will discuss the implications of current limits and future prospects.

宇宙基本計画

2013-01

http://www.kantei.go.jp/jp/singi/utyuu/keikaku.html

page.25

我が国の取組 我が国の宇宙科学・宇宙探査は、世界的にも高く評価されており、宇宙物

理学・天文学や太陽系探査科学の分野では、世界をリードしている。近年で は、世界初の小惑星サンプルリターンに成功した「はやぶさ」や月探査の「か ぐや」、太陽極域磁場の反転を捉えた「ひので」、赤外線天体カタログを公開 した「あかり」、銀河団衝突現場を観測した「すざく」など、多くのプロジ ェクトが世界的に高い評価を受けている。


銀河団衝突現場
see 
http://tamura-job-log.blogspot.jp/search/label/a2256

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

2013-01-09 @ Subaru, hilo
http://subarutelescope.org/Science/seminar.html

複合的アプローチで探る宇宙の化学進化 @ IZU

http://www-x.phys.se.tmu.ac.jp/ceu12/index.php?Top

2012/09/26-28

Ｘ線で探る銀河団ガスの運動 @ 天文学会, 大分

2012-06-18 講演申し込み

Ｘ線で探る銀河団ガスの運動

2012-09-21 My Talk

報告PDF 

http://www.isas.jaxa.jp/home/ttamura/TamuraPresen/tamura201209tenmonOitaPublic.pdf 

「すざく」，宇宙で最重量級の衝突現場を検証する

- my web page
- ISAStopics
- ustrem
- ISAS News 2012-02, すざく」で探る銀河団プラズマの運動

Structure in Clusters and Groups of Galaxies in the Chandra Era 2011, July

2011-7-11-14, @ Bonston, MA
http://cxc.harvard.edu/cdo/xclust11/

IXO meeting, Rome, 2011-3

http://www.iasf-roma.inaf.it/IXO/
I presented
Suzaku measurements of gas bulk motions in galaxy clusters.
The presentation pdf can be found below.
http://www.iasf-roma.inaf.it/IXO/IXOProgramme.htm

Discovery of Gas Bulk Motion in the Galaxy Cluster Abell 2256 with Suzaku

2011-1-31
submitted to PASJ.

2011-03-28
accepted.
This is my 10th 1st-author paper.

http://adsabs.harvard.edu/abs/2011PASJ...63S1009T


In ISAS news in 2012 -
http://www.isas.jaxa.jp/e/forefront/2012/tamura/