Search Publications
X-Ray Spectrum of Sagittarius A East
Maeda, Yoshitomo; Koyama, Katsuji; Matsumoto, Hironori +5 more
Sgr A East is a young SNR located in the Galactic Center (GC) region. Since the GC region is occupied by diffuse X-ray emission (GCDX) with a strong 6.7keV line, an estimation of the GCDX is crucial to study the X-ray spectrum of Sgr A East. The flux and spectrum of the GCDX are found to be smoothly distributed around and across Sgr A East, and he…
Small-Scale X-Ray/EUV Jets Seen in Hinode XRT and TRACE
Chae, Jongchul; Kim, Yeon-Han; Park, Young-Deuk +4 more
We present the morphological and kinematic characteristics of three small-scale X-ray/EUV jets simultaneously observed by the Hinode XRT and the TRACE. For this, we examined all XRT movies with a thin Al/Poly filter from 2006 October 20 to 2007 April 8, and then found 34 small-scale eruptions. We next took a look at the corresponding TRACE 171/195…
The Analysis of Penumbral Fine Structure Using an Advanced Inversion Technique
Tsuneta, Saku; Shimizu, Toshifumi; Ichimoto, Kiyoshi +8 more
We present a method to study the penumbral fine structure using data obtained by the spectropolarimeter on board Hinode. For the first time, the penumbral filaments can be considered as being resolved in spectropolarimetric measurements. This enables us to use inversion codes with only one-component model atmospheres, and thus to assign the obtain…
Suzaku Observation of Two Ultraluminous X-Ray Sources in NGC 1313
Done, Chris; Isobe, Naoki; Petre, Robert +19 more
Two ultraluminous X-ray sources (ULXs) in the nearby Sb galaxy NGC 1313, named X-1 and X-2, were observed with Suzaku on 2005 September 15. During the observation for a net exposure of 28 ks (but over a gross time span of 90ks), both objects varied in intensity by about 50%. The 0.4-10keV X-ray luminosities of X-1 and X-2 were measured as 2.5 × 10…
Initial Helioseismic Observations by Hinode/SOT
Tsuneta, Saku; Shimizu, Toshifumi; Zhao, Junwei +12 more
Results from initial helioseismic observations by the Solar Optical Telescope on-board Hinode are reported. It has been demonstrated that intensity oscillation data from the Broadband Filter Imager can be used for various helioseismic analyses. The k - ω power spectra, as well as the corresponding time-distance cross-correlation function, which pr…
Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator
Mori, Hideyuki; Porter, Frederick S.; Kokubun, Motohide +15 more
We observed the bright unidentified TeV γ-ray source HESS J1616-508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1 × 10-13 erg s-1 cm-2 in the 2-10keV band, which is some 60-times below the γ-ray flux in the 1-10TeV band. This object is br…
Properties of UIR Bands in NGC6946 Based on Mid-Infrared Imaging and Spectroscopy with Infrared Camera on Board AKARI
Serjeant, S.; Ohyama, Y.; Takagi, T. +23 more
We present results on mid-infrared imaging and spectroscopic observations of the nearby late-type spiral NGC6946 with the Infrared Camera on board AKARI. Based on mid-infrared imaging with the S7 (7µm may be tools to measure the star-formation activity in remote galaxies if these ratios and their variations are well examined and established …
Detection of Highly-Ionized Carbon and Nitrogen Emission Lines from the Cygnus Loop Supernova Remnant with the Suzaku Observatory
Katsuda, Satoru; Kokubun, Motohide; Hughes, John P. +3 more
We present the results of a Suzaku observation at the northeastern limb of the Cygnus Loop supernova remnant. The high detection efficiency together with the high spectral resolution of the Suzaku X-ray CCD cameras enables us to detect highly-ionized C and N emission lines from the Cygnus Loop for the first time. We performed an annular spectral a…
Umbral Fine Structures in Sunspots Observed with Hinode Solar Optical Telescope
Matsumoto, Takuma; Shibata, Kazunari; Tsuneta, Saku +15 more
A high resolution imaging observation of a sunspot umbra was made with the Hinode Solar Optical Telescope. Filtergrams at wavelengths of the blue and green continua were taken during three consecutive days. The umbra consisted of a dark core region, several diffuse components, and numerous umbral dots. We derived basic properties of umbral dots (U…
Suzaku Observation of Diffuse X-Ray Emission from the Carina Nebula
Hamaguchi, Kenji; Petre, Robert; Tsujimoto, Masahiro +9 more
We studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 August 29.The X-ray morphology, plasma temperature, and absorption to the plasma are consistent with the earlier Einstein results.The Suzaku spectra newly revealed emission lines from various species, including oxygen, but not from nitrogen.This …