Search Publications
Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum
Gandhi, Poshak; Makishima, Kazuo; Miyawaki, Ryohei +5 more
A report is presented on Suzaku observations of the ultra-luminous X-ray source X-1 in the starburst galaxy M 82, made three times in 2005 October for an exposure of ∼30ks each. The XIS signals from a region of radius 3' around the nucleus defined a 2--10keV flux of 2.1 × 10-11erg s-1cm-2 attributable to point sour…
Suzaku Observation of the Radio Halo Cluster Abell 2319: Gas Dynamics and Hard X-Ray Properties
Nakazawa, Kazuhiro; Takizawa, Motokazu; Sugawara, Chika
We present the results of a Suzaku observation of the radio halo cluster Abell 2319 (A 2319). The metal abundance in the central cool region is found to be higher than the surrounding region, which was not resolved in former studies. We confirm that the line-of-sight velocities of the intracluster medium in the observed region are consistent with …
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…
X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku
Fabian, Andrew C.; Takahashi, Tadayuki; Yamauchi, Makoto +13 more
We report on results from a Suzaku observation of the narrow-line Seyfert 1 NGC 4051. During our observation, large-amplitude rapid variability was seen, and the averaged 2--10keV flux was 8.1×10-12erg s-1cm-2, which is several times lower than the historical average. The X-ray spectrum hardens when the source flux…
Temperature and Metallicity in the Intra-Cluster Medium of Abell 262 Observed with Suzaku
Sato, Kosuke; Gastaldello, Fabio; Matsushita, Kyoko
We studied the temperature and abundance distributions of the intra-cluster medium (ICM) in the Abell 262 cluster of galaxies observed with Suzaku. Abell 262 is a bright, nearby poor cluster with an ICM temperature of ∼2keV, thus providing useful information about the connection of ICM properties between groups and clusters of galaxies. With the X…
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…
Suzaku Observations of SGR1900+14 and SGR1806-20
Yonetoku, D.; Mihara, T.; Yamaoka, K. +8 more
Spectral and timing studies of Suzaku ToO observations of two SGRs, 1900+14 and 1806-20, are presented. The X-ray quiescent emission spectra were well fitted by a two blackbody function or a blackbody plus a power law model. The non-thermal hard component discovered by INTEGRAL was detected by the PIN diodes and its spectrum was reproduced by the …
X-Ray Reflection Nebulae with Large Equivalent Widths of the Neutral Iron Kα Line in the Sagittarius C Region
Koyama, Katsuji; Nakajima, Hiroshi; Matsumoto, Hironori +5 more
This paper reports on the first results of a Suzaku observation in the Sgr C region. We detected four diffuse clumps with strong line emission at 6.4keV, Kα from neutral or low-ionized Fe. One of them, M359.38-0.00, was newly discovered with Suzaku. The X-ray spectra of the two bright clumps, M359.43-0.07 and M359.47-0.15, after subtracting the ga…
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…