Search Publications
Suzaku Observations of Abell 1795: Cluster Emission to r200
Miller, Eric D.; Sanders, Jeremy S.; Hughes, John P. +10 more
We report Suzaku observations of the galaxy cluster Abell 1795 that extend to r_200 ~ 2 Mpc, the radius within which the mean cluster mass density is 200 times the cosmic critical density. These observations are the first to probe the state of the intracluster medium in this object at r > 1.3 Mpc. We sample two disjoint sectors in the cluster o…
Time Variability of the Neutral Iron Lines from the Sagittarius B2 Region and Its Implication of a Past Outburst of Sagittarius A
Koyama, Katsuji; Matsumoto, Hironori; Tsuru, Takeshi Go +1 more
We investigated long-term X-ray behavior from the Sgr B2 complex using archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra, and ASCA. The observed region of the Sgr B2 complex included two prominent spots in the FeI Kα line at 6.40keV, a giant molecular cloud, M0.66-0.02, known as the ``Sgr B2 cloud'' and an unusual X-ray source, G0.…
Hard X-Ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku
Sarazin, Craig L.; Fukazawa, Yasushi; Makishima, Kazuo +10 more
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in a wide energy band from 0.5 to 40keV. The hard X-ray (>10keV) flux observed by the HXD around the cluster center cannot be explained by a simple extension of the thermal emissio…
Suzaku Observation of HESS J1825-137: Discovery of Largely-Extended X-Rays from PSR J1826-1334
Koyama, Katsuji; Matsumoto, Hironori; Bamba, Aya +2 more
We observed the brightest part of HESS J1825-137 with the Suzaku XIS, and found diffuse X-rays extending at least up to 15' (∼17pc) from the PSR J1826-1334. The spectra have no emission line, and were fitted with an absorbed power-law model. The X-rays, therefore, are likely to be due to synchrotron emission from a pulsar wind nebula. The photon i…
Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku
Fukazawa, Yasushi; Awaki, Hisamitsu; Terashima, Yuichi +1 more
We have obtained a broad-band spectrum of the Compton-thick Seyfert 2 galaxy NGC 2273 with Suzaku. The spectrum reveals the first detection of hard X-rays above ∼10keV from NGC 2273. The broad-band spectrum is well represented by a three component model, accompanied by both a strong iron Kα line with an equivalent width of ∼1.8keV and several weak…
Suzaku Observation of Group of Galaxies NGC 507: Temperature and Metal Distributions in the Intra-Cluster Medium
Ishida, Manabu; Sato, Kosuke; Ohashi, Takaya +3 more
The temperature and abundance distributions of the intra-cluster medium (ICM) in the NGC 507 group of galaxies were studied with Suzaku. The observed concentric annular spectra were well-represented by a two-temperature model for ICM, and steeper abundance gradients were found for Mg, Si, S, and Fe compared with O in the central region. The abunda…
Suzaku Observations of Metallicity Distribution in the Intracluster Medium of the NGC 5044 Group
Sato, Kosuke; Ohashi, Takaya; Matsushita, Kyoko +2 more
The metallicity distribution in the intracluster medium of the NGC 5044 group was studied up to 0.3r180 using the XIS instrument aboard the Suzaku satellite. The abundances of O, Mg, Si, S, and Fe were measured with high accuracy. The region within a radius of 0.05r180 from the center shows approximately solar abundances of M…
Hard X-Ray Spectrum from West Lobe of Radio Galaxy Fornax A Observed with Suzaku
Tashiro, M. S.; Seta, H.; Isobe, N. +2 more
An observation of the West lobe of radio galaxy Fornax A (NGC 1316) with Suzaku is reported. Since Feigelson et al. (1995) and Kaneda et al. (1995) discovered the cosmic microwave background boosted inverse-Comptonized (IC) X-rays from the radio lobe, the magnetic field and electron energy density in the lobes have been estimated under the assumpt…
Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates
Yamaoka, Kazutaka; Nakagawa, Yujin E.; Yoshida, Atsumasa +1 more
Spectral studies of quiescent emission and bursts of magnetar candidates based on XMM-Newton, Chandra, and Swift data are presented. Spectra of both the quiescent emission and the burst for most magnetar candidates are reproduced by a photoelectrically absorbed two-blackbody function (2BB). There is a strong correlation between the lower and highe…
Optically Thick Outflows of Supercritical Accretion Discs: Radiative Diffusion Approach
Karpov, Sergey; Abolmasov, Pavel; Kotani, Taro
Highly supercritical accretion discs are probable sources of dense optically thick axisymmetric winds. We introduce a new approach based on diffusion approximation radiative transfer in a funnel geometry, and obtain an analytical solution for the energy density distribution inside the wind, assuming that all of the mass, momentum and energy are in…