Search Publications
X-Ray Observations of the W 51 Complex with Suzaku
Fukazawa, Yasushi; Hanabata, Yoshitaka; Bamba, Aya +2 more
We present a detailed analysis of X-ray emission from the middle-aged supernova remnant W 51 C and star-forming region W 51 B with Suzaku. The soft X-ray emission from W 51 C is well-represented by an optically thin thermal plasma in a non-equilibrium ionization state with a temperature of
Spectral Variation of Hard X-Ray Emission from the Crab Nebula with the Suzaku Hard X-Ray Detector
Enoto, Teruaki; Fukazawa, Yasushi; Makishima, Kazuo +6 more
The Crab Nebula is one of the brightest and most stable sources in the X-ray sky. Year-scale flux variation from the object was recently revealed in the hard X-ray band by four satellites. This marked the first detection of year-scale variability from pulsar wind nebulae in the hard X-ray band. The Crab Nebula has been observed at least once a yea…
An X-Ray Study of the Galactic-Scale Starburst-Driven Outflow in NGC 253
Yamasaki, Noriko Y.; Mitsuishi, Ikuyuki; Takei, Yoh
The X-ray properties of hot interstellar gas in a bright, nearby edge-on starburst galaxy, NGC 253, were investigated so as to gain a further understanding of starburst-driven outflow activity by utilizing XMM-Newton and Suzaku. Spectroscopic analyses for three regions of the galaxy characterized by multiwavelength observations, i.e., the superwin…
Low-Resolution Spectrum of the Zodiacal Light with the AKARI InfraRed Camera
Sakon, Itsuki; Matsuura, Shuji; Wada, Takehiko +3 more
We present near- and mid-infrared zodiacal light spectra obtained with the AKARI Infra-Red Camera (IRC). A catalog of 278 spectra of the diffuse sky covering a wide range of Galactic and ecliptic latitudes was constructed. The wavelength range of this catalog is
Distribution of Si, Fe, and Ni in the Intracluster Medium of the Coma Cluster
Sato, Kosuke; Matsushita, Kyoko; Sato, Takuya +1 more
We studied the distributions of Si, Fe, and Ni in the intracluster medium (ICM) of the Coma cluster, one of the largest clusters in the nearby universe, using XMM-Newton data up to 0.5 r180 and Suzaku data of the central region up to 0.16 r180. Using the flux ratios of the Lyα line of H-like Si and the 7.8 keV line blend to t…
A New Cluster of Galaxies Towards the Galactic Bulge, Suzaku J1759-3450
Maeda, Yoshitomo; Haba, Yoshito; Mori, Hideyuki +2 more
We observed an extended X-ray source, designated as Suzaku J1759-3450, with Suzaku and Chandra observations towards 1RXS J175911.0-344921, which is an unidentified X-ray source listed in the ROSAT Bright Source Catalogue. A conspicuous emission line at 6 keV was also found in the Suzaku J1759-3450 spectrum. Assuming the emission line to be K emiss…
Suzaku Detection of Thermal X-Ray Emission Associated with the Western Radio Lobe of Fornax A
Tashiro, Makoto S.; Inoue, Susumu; Seta, Hiromi
We present the results of X-ray mapping observations of the western radio lobe of the Fornax A galaxy, using the X-ray Imaging Spectrometer (XIS) onboard the Suzaku satellite with a total exposure time of 327 ks. The purpose of this study is to investigate the nature and spatial extent of the diffuse thermal emission around the lobe by exploiting …
Long-Term Variability of the O VII Line Intensity toward the Lockman Hole Observed with Suzaku from 2006 to 2011
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Sakai, Kazuhiro +3 more
Long-term time variabilities of the O VII (0.57 keV) emission in the soft X-ray diffuse background were studied using six Suzaku annual observations of the blank sky towards the Lockman Hole made from 2006 to 2011. After time intervals in which the emission was enhanced on time scales of a few tens of ks were removed, the O VII intensity was found…
An X-Ray Counterpart of HESS J1427-608 Discovered with Suzaku
Dotani, Tadayasu; Terada, Yukikatsu; Matsumoto, Hironori +9 more
We report on the discovery of an X-ray counterpart of the unidentified very high-energy gamma-ray source HESS J1427-608. In the sky field coincident with HESS J1427-608, an extended source was found in the 2-8 keV band, and was designated as Suzaku J1427-6051. Its X-ray radial profile has an extension of σ = 0.'9 ± 0.'1 if approximated by a Gaussi…
Two Power-Law States of the Ultraluminous X-Ray Source IC 342 X-1
Isobe, Naoki; Kubota, Aya; Mineshige, Shin +3 more
In order to elucidate the emission properties of ultraluminous X-ray sources (ULXs) during their power-law (PL) state, we examined long-term X-ray spectral data of IC 342 X-1 during its PL state by using our own Suzaku data and archival data by XMM-Newton, Chandra, and Swift observations. The PL state of this source seems to be classified into two…