108 citations · 657 across the 21 of their papers we have counts for
21 papers
Japan's Possible Contributions for Coronagraph of the Habitable Worlds Observatory (HWO)
Keigo Enya, Kenta Yoneta, Naoshi Murakami +20
In this paper, we describe Japan's possible contributions for coronagraph of the Habitable Worlds Observatory (HWO) based on our independent study. We are considering to contribute…
Resonant scattering at the center of the galaxy cluster PKS 0745-191 with XRISM
Keita Tanaka, Megan Eckart, Kotaro Fukushima +11
We report evidence for the resonant scattering effect at the center of the galaxy cluster PKS 0745-191 with XRISM. We analyzed XRISM/Resolve commissioning-phase observations of the…
The bulk motion of gas in the core of the Centaurus galaxy cluster
XRISM collaboration
Galaxy clusters, the largest gravitationally bound structures in the Universe, contain vast amounts of dark matter, galaxies, and hot ionised gas known as the intracluster medium (…
Temperature Structure in the Perseus Cluster Core Observed with Hitomi
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +192
The present paper investigates the temperature structure of the X-ray emitting plasma in the core of the Perseus cluster using the 1.8--20.0 keV data obtained with the Soft X-ray S…
Exploring Hot Gas at Junctions of Galaxy Filaments with Suzaku
Ikuyuki Mitsuishi, Hajime Kawahara, Norio Sekiya +3
We performed five pointing observations with Suzaku to search for hot gases associated with the junctions of galaxy filaments where no significant diffuse X-ray sources were detect…
Origin of Thermal and Non-Thermal Hard X-ray Emission from the Galactic Center
Vladimir Dogiel, Dmitrii Chernyshov, Takayuki Yuasa +10
We analyse new results of Chandra and Suzaku which found a flux of hard X-ray emission from the compact region around Sgr A (r ~ 100 pc). We suppose that this emission is ge…
Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku
Yoh Takei, Takaya Ohashi, J. Patrick Henry +12
We searched for redshifted O emission lines from the possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the XIS instrument on…
XMM-Newton Observation of IC 310 in the Outer Region of the Perseus Cluster of Galaxies
K. Sato, T. Furusho, N. Y. Yamasaki +3
We present results from an XMM-Newton observation of the head-tail radio galaxy IC 310 located in the southwest region of the Perseus cluster. The spectrum is well-fitted by an abs…
Locating the Warm-Hot Intergalactic Medium in the Simulated Local Universe
K. Yoshikawa, K. Dolag, Y. Suto +11
We present an analysis of mock spectral observation of warm-hot intergalactic medium (WHIM) using a constrained simulation of the local universe. The simulated map of oxygen emissi…
Probing Warm-Hot Intergalactic Medium Associated with the Virgo Cluster using an Oxygen Absorption Line
R. Fujimoto, Y. Takei, T. Tamura +8
To detect a warm-hot intergalactic medium associated with the large-scale structure of the universe, we observed a quasar behind the Virgo cluster with XMM-Newton. With a net expos…
Detection of highly ionized O and Ne absorption lines in the X-ray spectrum of 4U1820-303 in the globular cluster, NGC 6624
Kazuo Futamoto, Kazuhisa Mitsuda, Yoh Takei +2
We searched for absorption lines of highly ionized O and Ne in the energy spectra of two Low-mass X-ray binaries, 4U1820-303 in the globular cluster NGC6624 and Cyg X-2, observed w…
Chandra observation of the core of the galaxy cluster AWM7
T. Furusho, N. Y. Yamasaki, T. Ohashi
We present results from a Chandra observation of the core region of the nearby X-ray bright galaxy cluster AWM7. There are blob-like substructures, which are seen in the energy ban…
Chandra observation of the central galaxies in A1060 cluster of galaxies
N. Y. Yamasaki, T. Ohashi, T. Furusho
Chandra observation of the central region of the A1060 cluster of galaxies resolved X-ray emission from two giant elliptical galaxies, NGC 3311 and NGC 3309. The emission from thes…
Temperature Map of the Perseus Cluster of Galaxies Observed with ASCA
T. Furusho, N. Y. Yamasaki, T. Ohashi +2
We present two-dimensional temperature map of the Perseus cluster based on multi-pointing observations with the ASCA GIS, covering a region with a diameter of ~2^\circ. By correcti…
ASCA Temperature Maps of Three Clusters of Galaxies Abell 1060, AWM7, and the Centaurus Cluster
T. Furusho, N. Y. Yamasaki, T. Ohashi +6
We present two-dimensional temperature maps of three bright clusters of galaxies Abell 1060, AWM7, and the Centaurus cluster, based on multi-pointing observations with the ASCA GIS…
Temperature Map of the Virgo Cluster of Galaxies Observed with ASCA
R. Shibata, K. Matsushita, N. Y. Yamasaki +5
The temperature distribution of the intracluster medium (ICM) in the Virgo cluster of galaxies has been derived from extensive mapping observations with ASCA covering an area of 19…
ASCA Observation of the Lyman-limit Quasar PKS2145+067
N. Y. Yamasaki, T. Ishikawa, T. Ohashi
X-ray observation of a famous Lyman-limit quasar PKS2145+067at z_em= 0.990 was carried with ASCA. The source showed a 2-10 keV flux of 1.3 E-11 erg cm^-2 sec^-1 (L_X = 2.5 E46 erg…
X-Ray Observation of the L1157 Dark Cloud Region with ASCA
T. Furusho, N. Y. Yamasaki, T. Ohashi +2
ASCA observation of a region containing a Class 0 protostar, IRAS 20386+6751 in the L1157 dark cloud, has been carried out. The protostar was not detected, and the 95% upper limit…
Detection of an X-Ray Hot Region in the Virgo Cluster of Galaxies with ASCA
K. Kikuchi, C. Itoh, A. Kushino +8
Based on mapping observations with ASCA, an unusual hot region with a spatial extent of 1 square degree was discovered between M87 and M49 at a center coordinate of R. A. = 12h 27m…
Exploratory ASCA Observations of Broad Absorption Line Quasi-Stellar Objects
S. C. Gallagher, W. N. Brandt, R. M. Sambruna +2
We present the analysis and interpretation of a sample of eight ASCA observations of Broad Absorption Line Quasi-Stellar Objects (BALQSOs). This is the first moderate-sized sample…
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…