Search Publications
Evolution of the Sheared Magnetic Fields of Two X-Class Flares Observed by Hinode/XRT
Golub, Leon; van Ballegooijen, Adriaan; Narukage, Noriyuki +6 more
We present multi-wavelength observations of the evolution of the sheared magnetic fields in NOAA Active Region 10930, where two X-class flares occurred on 2006 December 13 and December 14, respectively. Observations made with the X-ray Telescope (XRT) and the Solar Optical Telescope (SOT) aboard Hinode suggest that the gradual formation of the she…
Hinode Calibration for Precise Image Co-Alignment between SOT and XRT (2006 November-2007 April)
Kano, Ryohei; Sakao, Taro; Tsuneta, Saku +11 more
To understand the physical mechanisms for activity and heating in the solar atmosphere, the magnetic coupling from the photosphere to the corona is an important piece of information from the Hinode observations, and therefore precise positional alignment is required among the data acquired by different telescopes. The Hinode spacecraft and its onb…
Suzaku Observation of the Metallicity Distribution in the Intracluster Medium of the Fornax Cluster
Fukazawa, Yasushi; Makishima, Kazuo; Nakazawa, Kazuhiro +10 more
The metallicity distribution in the Fornax cluster was studied with the XIS instrument on board the Suzaku satellite. The K-shell lines of O and Mg were resolved clearly, and the abundances of O, Mg, Si, S, and Fe were measured with great accuracy. The region within a 4' radius of NGC 1399 shows approximately solar abundances of Fe, Si, and S, whi…
Precision Fe Kα and Fe Kβ Line Spectroscopy of the Seyfert 1.9 Galaxy NGC 2992 with Suzaku
Haba, Yoshito; Okajima, Takashi; Serlemitsos, Peter J. +13 more
We present detailed time-averaged X-ray spectroscopy in the 0.5-10keV band of the Seyfert 1.9 galaxy NGC 2992 with the Suzaku X-ray Imaging Spectrometer (XIS). There is an Fe K line emission complex that we model with broad and narrow lines and we show that the intensities of the two components are decoupled at a confidence level >3σ The broad …
Discoveries of Diffuse Iron Line Sources from the Sgr B Region
Maeda, Yoshitomo; Koyama, Katsuji; Matsumoto, Hironori +8 more
The radio complex Sgr B region was observed with the X-ray Imaging Spectrometer (XIS) on board Suzaku. This region exhibits diffuse iron lines at 6.4, 6.7, and 6.9keV, which are Kα lines of Fe I (neutral iron), Fe XXV (He-like iron), and Fe XXVI (H-like iron), respectively. The high energy resolving power of the XIS provided separate maps of the K…
X-Ray Spectral Study of the Extended Emission, `the Cap', Located 11.6kpc above the Disk of M82
Koyama, Katsuji; Mitsuda, Kazuhisa; Fujimoto, Ryuichi +11 more
The extended X-ray emission from `the Cap' region, located 11' (11.6kpc) above the disk of the starburst galaxy M82, has been observed with Suzaku and XMM-Newton. Owing to the good energy resolution and the large collecting area of the XIS on Suzaku, combined with similar properties of the EPIC instrument on XMM-Newton, we have clearly detected K-…
Small-Scale Magnetic-Flux Emergence Observed with Hinode Solar Optical Telescope
Matsumoto, Takuma; Shibata, Kazunari; Tsuneta, Saku +14 more
We observed small-scale magnetic-flux emergence in a sunspot moat region by the Solar Optical Telescope (SOT) aboard the Hinode satellite. We analyzed filtergram images observed at wavelengths of Fe 6302Å, G band, and CaII H. In Stokes I images of Fe 6302Å, emerging magnetic flux was recognized as dark lanes. In the G band, they showed to be their…
Flight Performance of the AKARI Cryogenic System
Nakagawa, Takao; Murakami, Masahide; Yoshida, Seiji +11 more
We describe the flight performance of the cryogenic system of the infrared astronomical satellite AKARI, which was successfully launched on 2006 February 21 (UT). AKARI carries a 68.5 cm telescope together with two focal plane instruments, Infrared Cameras (IRC) and Far Infrared Surveyor (FIS), all of which are cooled down to cryogenic temperature…
Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium
Fabian, Andrew C.; Sanders, Jeremy S.; Kelley, Richard L. +13 more
The Centaurus cluster (z=0.0104) was observed with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku X-ray satellite in three pointings, one centered on the cluster core and the other two offset by ±8' in declination. To search for possible bulk motions of the intracluster medium, the central energy of a He-like Fe K line (at a rest-frame en…
Initial Results on Line-of-Sight Field Calibrations of SP/NFI Data Taken by SOT/Hinode
Moon, Yong-Jae; Tsuneta, Saku; Chae, Jongchul +13 more
We present initial results on the line-of-sight field calibration of the two kinds of Stokes I and V data taken by the Solar Optical Telescope on the satellite Hinode: spectral profiles of Stokes I and V parameters recorded on the Spectro-polarimeter (SP), and monochromatic images of the same parameters recorded on the Narrow-band Filter Imager (N…