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A High-Abundance Arc in the Compact Group of Galaxies HCG 62: An AGN- or Merger-Induced Metal Outflow?
Junhua Gu, Haiguang Xu, Liyi Gu +4
We present a Chandra study of the metal distribution in the X-ray bright compact group of galaxies HCG 62. We find that the diffuse X-ray emission is peaked at the core of the cent…
Probing the Mass Distributions in NGC 1407 and Its Associated Group with the X-ray Imaging Spectroscopic and Optical Photometric and Line-strength Indices Data
Zhongli Zhang, Haiguang Xu, Yu Wang +3
We present a study of the mass distributions in the bright E0 galaxy NGC 1407 and its associated group by analyzing the high quality Chandra and ROSAT X-ray spectroscopic data. In…
Chandra Observation of the Cluster of Galaxies MS 0839.9+2938 at z=0.194: the Central Excess Iron and SN Ia Enrichment
Yu Wang, Haiguang Xu, Zhongli Zhang +4
We present the Chandra study of the intermediately distant cluster of galaxies MS 0839.9+2938. By performing both the projected and deprojected spectral analyses, we find that the…
Chandra Study of X-Ray Point Sources in the Early-Type Galaxy NGC 4552 (M89)
Yueheng Xu, Haiguang Xu, Zhongli Zhang +3
We present a Chandra ACIS study of the early-type galaxy NGC 4552. We detect 47 X-ray point sources, most of which are likely LMXBs, within 4 R_e. The brightest X-ray source coinci…
Joint X-Ray and Optical Measurements of the Mass Distribution of the Distant Galaxy Cluster CLJ 0152.7-1357
Zhi-Ying Huo, Sui-Jian Xue, Haiguang Xu +2
We present joint X-ray and optical observations of the high redshift (z~0.83) lensing cluster CLJ0152.7-1357 made with the Chandra X-ray Observatory and the Keck telescope. We conf…
X-Ray Probing of the Central Regions of Clusters of Galaxies
Kazuo Makishima, Hajime Ezawa, Yasushi Fukazawa +10
Results of ASCA X-ray study of central regions of medium-richness clusters of galaxies are summarized, emphasizing differences between cD and non-cD clusters. The intra-cluster med…
The Mass-Temperature Relation of 22 Nearby Clusters
Haiguang Xu, Guangxue Jin, Xiang-Ping Wu
We present a new investigation of the mass-temperature (\MTrelation) relation of 22 nearby clusters based on the analysis of their ROSAT X-ray surface brightness profiles ($S_{X}(r…
ASCA Observations of Three Shakhbazyan's Compact Groups of Galaxies
Isao Takahashi, Yasushi Fukazawa, Keiichi Kodaira +3
X-ray observations of three Shakhbazyan's Compact Groups of Galaxies, SCGG 202, SCGG 205, and SCGG 223, are presented for the first time. Extended X-ray emission was detected from…
Three-Layered Atmospheric Structure in Accretion Disks Around Stellar-Mass Black Holes
S. N. Zhang, Wei Cui, Wan Chen +5
Modeling of the x-ray spectra of the Galactic superluminal jet sources GRS 1915+105 and GRO J1655-40 reveal a three-layered atmospheric structure in the inner region of their accre…
X-ray Measurements of the Gravitational Potential Profile in the Central Region of the Abell 1060 Cluster of Galaxies
Takayuki Tamura, Kazuo Makishima, Yasushi Fukazawa +2
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 galaxie…
Two-Phased Intra-Cluster Medium in the Centaurus Cluster of Galaxies
Yasushi Ikebe, Kazuo Makishima, Yasushi Fukazawa +4
ASCA and ROSAT data of the Centaurus cluster were analyzed. A central excess in the radial brightness profile is found in the hard energy band up to 10keV. This requires a deeper c…
Discovery of the Central Excess Brightness in Hard X-rays in the Cluster of Galaxies Abell 1795
H. Xu, K. Makishima, Y. Fukazawa +4
Using the X-ray data from \ASCA, spectral and spatial properties of the intra-cluster medium (ICM) of the cD cluster Abell 1795 are studied, up to a radial distance of (…
ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium
Yasushi Fukazawa, Kazuo Makishima, Takayuki Tamura +5
We analyzed the ASCA X-ray data of 40 nearby clusters of galaxies, whose intracluster-medium temperature distributes in the range of 0.9--10 keV. We measured the Si and Fe abundanc…
Discovery of a Large-Scale Abundance Gradient in the Cluster of Galaxies AWM7 with ASCA
H. Ezawa, Y. Fukazawa, K. Makishima +4
A large-scale gradient in the metal abundance has been detected with ASCA from an X-ray bright cluster of galaxies AWM7. The metal abundance shows a peak of 0.5 solar at the center…