Makishima, Kazuo; Ezawa, Hajime; Fukuzawa, Yasushi; Honda, Hirohiko; Ikebe, Yasushi; Kamae, Tuneyoshi; Kikuchi, Ken'ich; Matsushita, Kyoko; Nakazawa, Kazuhiro; Ohashi, Takaya, et al.
日本天文学会欧文研究報告論文賞受賞
2006年度
http://adsabs.harvard.edu/abs/2001PASJ...53..401M
2000年10月1日日曜日
X-ray spectroscopy of the cluster of galaxies Abell 1795 with XMM-Newton
Accepted on A&A in 2001.
Abstract
The initial results from XMM-Newton observations of the rich cluster of galaxies Abell 1795 are presented. The spatially-resolved X-ray spectra taken by the European Photon Imaging Cameras (EPIC) show a temperature drop at a radius of
200 kpc from the cluster center, indicating that the ICM is cooling. Both the EPIC and the Reflection Grating Spectrometers (RGS) spectra extracted from the cluster center can be described by an isothermal model with a temperature of 4 keV. The volume emission measure of any cool component (VIII Lyman 
line was detected with the RGS from the cluster core. The O abundance and its ratio to Fe at the cluster center is 0.2-0.5 and 0.5-1.5 times the solar value, respectively.
http://adsabs.harvard.edu/abs/2001A%26A...365L..87T
citation papers
http://goo.gl/4iwcJC
Abstract
The initial results from XMM-Newton observations of the rich cluster of galaxies Abell 1795 are presented. The spatially-resolved X-ray spectra taken by the European Photon Imaging Cameras (EPIC) show a temperature drop at a radius of
200 kpc from the cluster center, indicating that the ICM is cooling. Both the EPIC and the Reflection Grating Spectrometers (RGS) spectra extracted from the cluster center can be described by an isothermal model with a temperature of 4 keV. The volume emission measure of any cool component (VIII Lyman line was detected with the RGS from the cluster core. The O abundance and its ratio to Fe at the cluster center is 0.2-0.5 and 0.5-1.5 times the solar value, respectively.http://adsabs.harvard.edu/abs/2001A%26A...365L..87T
citation papers
http://goo.gl/4iwcJC
2000年2月10日木曜日
2000-2 ASTRO-Eの打上げ失敗
https://www.isas.jaxa.jp/ISASnews/No.227/m-v-4.html
2000年２月10日(木)午前10時30分に，鹿児島宇宙空間観測所から打ち上げられたM-Vロケット４号機は，第１段モータの燃焼中に生じた異状により，Ｘ線天文衛星ASTRO-Eを所定の軌道に投入することができませんでした。
2000年2月1日火曜日
A new life in SRON, Utrecht, NL
On 2000-2, I moved to SRON, Utrecht, the Netherlands.
I got a post-doc position to work on XMM-Newton RGS instrument and data of X-ray clusters.
I worked as a member of the RGS team along with Drs. J.S.Kaastra, J.W.den Herder, and C. de Vries, J.Bleeker and other staff.
I had worked at SRON for three years. I liked this position very much.
I got a post-doc position to work on XMM-Newton RGS instrument and data of X-ray clusters.
I worked as a member of the RGS team along with Drs. J.S.Kaastra, J.W.den Herder, and C. de Vries, J.Bleeker and other staff.
I had worked at SRON for three years. I liked this position very much.
1998年4月1日水曜日
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.
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.
1998年3月1日日曜日
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.
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
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
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