Post-doc @ ISAS

from 1998-4-1 to 2000-1 (1 year and 9 month).
I worked at ISAS as a post-doc.
I mainly worked on Astro-E development for the launch on 2000 Feb.

First I belonged to Prof. Makino then to Prof. Mitsuda.

X-Ray Measurements of the Gravitational Potential Profile in the Central Region of the Abell 1060 ...

"X-Ray Measurements of the Gravitational Potential Profile in the Central Region of the Abell 1060 Cluster of Galaxies"
in ApJ, 2000

abstract
ABSTRACT. X-ray spectral and imaging data from ASCA and ROSAT were used to measure the total mass profile in the central region of Abell 1060, a nearby and relatively poor cluster of galaxies. The ASCA X-ray spectra, after being corrected for the spatial response of the X-ray telescope, show an isothermal distribution of the intracluster medium (ICM) within at least ~12' (or 160 h kpc; H₀ = 70 h₇₀ km s^-1 Mpc^-1) in radius of the cluster center. The azimuthally averaged surface brightness profile from the ROSAT Position Sensitive Proportional Counter (PSPC) exhibits a central excess above an isothermal β model. The ring-sorted ASCA Gas Imaging Spectrometer spectra and the radial surface brightness distribution from the ROSAT PSPC were simultaneously utilized to constrain the gravitational potential profile. Some analytic models of the total mass density profile were examined. The ICM density profile was also specified by analytic forms. The ICM temperature distribution was constrained to satisfy the hydrostatic equilibrium and to be consistent with the data. Then, the total mass distribution was found to be described better by the universal dark halo profile recently proposed by Navarro, Frenk, & White than by a King-type model with a flat density core. A profile with a central cusp together with a logarithmic radial slope of ~1.5 was also consistent with the data. Discussions are presented concerning the estimated dark matter distribution around the cluster center.

My Ph.D thesis: ASCA Measurements of the Gravitational Potential Profile in the Central Region of Galaxy Clusters

should be found below.
http://www.astro.isas.jaxa.jp/asca/bibliography/phd_thesis.html


http://www.astro.isas.jaxa.jp/asca/bibliography/phd_thesis/Tamura_Takayuki/ttamura.pdf

http://www.astro.isas.jaxa.jp/asca/bibliography/phd_thesis/Tamura_Takayuki/tamura_abs.html

ASCA Measurements of the Gravitational Potential Profile                                                
in the Central Region of Galaxy Clusters
                                                                  
「あすか」衛星による銀河団中心領域での重力ポテンシャル分布の測定                                    
http://gakui.dl.itc.u-tokyo.ac.jp/cgi-bin/gazo.cgi?no=113211

平成9年12月博士(理学)申請
(1998-12)
東京大学理学系研究科
物理学専攻
田村 隆幸

ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium

日本天文学会欧文研究報告論文賞受賞　2000年度

ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium

Fukazawa, Yasushi; Makishima, Kazuo; Tamura, Takayuki; Ezawa, Hajime; Xu, Haiguang; Ikebe, Yasushi; Kikuchi, Ken'ichi; Ohashi, Takaya

http://adsabs.harvard.edu/abs/1998PASJ...50..187F