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Evidence from the Extreme-Ultraviolet Imaging Spectrometer for Axial Filament Rotation before a Large Flare
Harra, Louise K.; Brooks, David H.; Hansteen, Viggo H. +2 more
In this article, we present observations made with the Extreme-ultraviolet Imaging Spectrometer on-board the Hinode solar satellite, of an active region filament in the HeII emission line at 256.32Å. The host active region AR 10930 produces an X-class flare during these observations. We measure Doppler shifts with apparent velocities of up to 20km…
Suzaku X-Ray Study of an Anomalous Source XSS J12270-4859
Ishida, Manabu; Tsujimoto, Masahiro; Ebisawa, Ken +1 more
We report on the results of a Suzaku X-ray observation of XSSJ12270-4859, one of the hard X-ray sources in the INTEGRAL catalogue. This object has been classified as an intermediate polar (IP) by its optical spectra, and a putative X-ray period of ∼860s. With a 30ks exposure by Suzaku, we obtained a well-exposed spectrum in the 0.2--70keV band. We…
Suzaku Observation of 30 Dor C: A Supernova Remnant with the Largest Non-Thermal Shell
Yamaguchi, Hiroya; Koyama, Katsuji; Bamba, Aya
This paper reports on the Suzaku results of thermal and non-thermal features of 30 Dor C, a supernova remnant (SNR) in a superbubble of the Large Magellanic Cloud (LMC). The west rim exhibits a non-thermal X-ray spectrum with no thermal component. A single power-law model is rejected, but a power-law model with spectral cutoff is accepted. The cut…
Time-Evolution of Peak Energy and Luminosity Relation within Pulses for GRB 061007: Probing Fireball Dynamics
Yamaoka, Kazutaka; Fukazawa, Yasushi; Nakagawa, Yujin E. +3 more
We performed a time-resolved spectral analysis of a bright, long gamma-ray burst GRB 061007 using Suzaku/WAM and Swift/BAT. Because of the large effective area of the WAM, we can investigate the time evolution of the spectral peak energy Etpeak and the luminosity Ltiso with 1-s time resolution, and we fi…
Suzaku Results on the Obscured Low-Luminosity Active Galactic Nucleus in NGC 4258
Makishima, Kazuo; Nakazawa, Kazuhiro; Yamada, Shin'ya +1 more
In 2006 June, the obscured low-luminosity active galactic nucleus in the nearby Seyfert 1.9 galaxy NGC 4258 was observed with Suzaku for ∼100ks. Utilizing the XIS and the HXD, the nucleus emission was detected over a ∼2 to ∼40keV range, with an unabsorbed 2-10keV luminosity of ∼8 × 1040ergs-1; it varied by a factor of ∼2 duri…
Broad-Band Temporal and Spectral Variation of 36 Active Galactic Nuclei Observed with Suzaku
Kunieda, Hideyo; Haba, Yoshito; Miyazawa, Takuya
36 AGN data observed by Suzaku were compiled to examine the temporal variability in different energy bands covered by soft X-ray imaging systems (XRT + XIS: 0.5-10 keV) and Hard X-ray Detector (HXD: 15-50 keV) aboard Suzaku. Three band light curves were obtained in L (0.5-2 keV), M (2-10 keV), and H (15-50 keV) with a time binning of 5760 s. The L…
Constraint of Non-Thermal X-Ray Emission from the On-Going Merger Cluster Abell 3376 with Suzaku
Isobe, Naoki; Fukazawa, Yasushi; Kokubun, Motohide +10 more
Clusters of galaxies are among the best candidates for particle acceleration sources in the universe, a signature of which is non-thermal hard X-ray emission from the accelerated relativistic particles. We present early results on Suzaku observations of non-thermal emission from Abell 3376, which is a nearby on-going merger cluster. Suzaku observe…
Suzaku Observation Adjacent to the South End of the Radio Arc
Koyama, Katsuji; Tsuru, Takeshi Go; Fukuoka, Ryosuke +1 more
Suzaku observed the Galactic center region near the Radio Arc at ∼20' southeast of Sagittarius A*. In an 18' × 18' field of view, we found four distinct X-ray sources: a bright star and a diffuse source associated with star clusters in the soft band (0.5-2.0keV), a small clump in a higher energy band (4-6keV), and a peculiar clump in th…
Spectral Variation of the Seyfert 1 Galaxy MCG -6-30-15 Observed with Suzaku
Terashima, Yuichi; Ebisawa, Ken; Inoue, Hajime +3 more
We have investigated the spectral variation of the Seyfert 1 galaxy MCG -6-30-15 observed with Suzaku in 2006 January for three separate periods spreading over fourteen days. We found that the time-averaged continuum energy spectrum between 1 keV and 40 keV can be approximated with a spectral model composed of a direct power-law component, its ref…
Suzaku Observation of the Metallicity Distribution in the Elliptical Galaxy NGC 4636
Fukazawa, Yasushi; Nishino, Sho; Hayashi, Katsuhiro +4 more
NGC 4636, an X-ray bright elliptical galaxy, was observed for 70 ks with Suzaku. The low background and good energy resolution of the XIS enable us to estimate the foreground Galactic emission accurately and hence measure, for the first time, the O, Mg, Si and Fe abundances out to a radius of ~28 arcmin ($\simeq$ 140 kpc). These metal abundances a…