Search Publications
Energetic Relations between the Disappearing Solar Filaments and the Associated Flare Arcades
Shibata, Kazunari; Morimoto, Taro; Kurokawa, Hiroki +1 more
We present the temporal and statistical relations between the mechanical energies of disappearing solar filaments and the thermal energies of the associated flare arcades in soft X-rays. Measuring the 3-D velocity fields of 10 eruptive filaments, we calculated their mechanical energy gain rate, ɛmc, per unit volume and compared it to th…
Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku
Makishima, Kazuo; Tashiro, Makoto S.; Matsushita, Kyoko +3 more
The Suzaku X-ray satellite observed the nearby S0 galaxy NGC 1316, a merger remnant aged 3 Gyr. The total good exposure time was 48.7 ks. The spectra were well represented by a two-temperature thermal model for the interstellar medium (ISM) plus a power-law model. The cool and hot temperatures of the thermal model were 0.48±0.03 and 0.92±0.04 keV,…
Suzaku Observation of the Anomalous X-Ray Pulsar 1E 1841-045
Terada, Yukikatsu; Ueno, Masaru; Takahashi, Hiromitsu +7 more
We report on the results of a Suzaku observation of the anomalous X-ray pulsar (AXP) 1E 1841-045 at the center of the supernova remnant Kes 73. We confirmed that the energy-dependent spectral models obtained by previous separate observations were also satisfied over a wide energy range from 0.4 to ∼70 keV, simultaneously. Here, the models below ∼1…
Water Production Rate of the Jupiter-Family Comet 46P/Wirtanen in the 2008 Apparition with the Subaru Telescope/IRCS
Kawakita, Hideyo; Kobayashi, Hitomi
We present the water production rate of comet 46P/Wirtanen in its 2008 apparition, determined from high-dispersion near-infrared spectroscopic observations. Comet 46P/Wirtanen, one of Jupiter-family comets, was the target of the ROSETTA mission in the past. Observations of comet 46P were carried out in the middle of 2008 February with the Subaru t…
Suzaku Constraints on Soft and Hard Excess Emissions from Abell 2199
Fukazawa, Yasushi; Makishima, Kazuo; Nakazawa, Kazuhiro +3 more
The nearby (z = 0.03015) cluster of galaxies Abell 2199 was observed by Suzaku in X-rays, with five pointings for ∼20ks each. From the XIS data, the temperature and metal abundance profiles were derived out to ∼700 kpc (0.4 times the virial radius). Both of these quantities decrease gradually from the center to peripheries by a factor of ∼2, while…
Suzaku Observations of the Great Annihilator and the Surrounding Diffuse Emissions
Koyama, Katsuji; Nobukawa, Masayoshi; Nakashima, Shinya +2 more
We report the Suzaku observation of 1E 1740.7-2942, a black hole candidate called the "Great Annihilator" (GA). The high-quality spectrum of Suzaku provides the severest constraints on the parameters of the GA. Two clumpy structures are found around the GA in the line images of FeI Kalpha at 6.4 keV and SXV Kalpha at 2.45 keV. One clump named M359…
Absolute Dimensions and Apsidal Motion of the Young Detached System LT Canis Majoris
Bilir, Selçuk; Demircan, Osman; Bakiş, Volkan +3 more
New high-resolution spectra of the short-period (P ∼ 1.76 days) young detached binary LT CMa are reported for the first time. By combining the results from an analysis of new radial-velocity curves and published light curves, we determine values for the masses, radii, and temperatures as follows: M1 = 5.59 (0.20) Modot, R
The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku
Matsushita, Kyoko; Nagino, Ryo
We derived the O, Ne, Mg, and Fe abundances in the interstellar medium (ISM) of a relatively isolated S0 galaxy, NGC 4382, observed with the Suzaku XIS instruments, and compared the O/Ne/Mg/Fe abundance pattern with that of the ISM in elliptical galaxies. The derived temperature and Fe abundance in the ISM are ∼ 0.3 keV and 0.6-2.9 solar, respecti…
Suzaku Observation of the Southeastern Rim of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +2 more
X-ray measured metal abundances of the rim of the Cygnus Loop are known to have two patterns. One, seen at narrow regions along the outermost edge, is 0.5-times the solar value, and the other, seen in the remainder of the rim, is 0.2-times the solar value. While the former is ``normal'', as the ISM around the Cygnus Loop, the latter is unexpectedl…
Study of the Large-Scale Temperature Structure of the Perseus Cluster with Suzaku
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Nishino, Sho +2 more
We report on a study of the large-scale temperature structure of the Perseus cluster with Suzaku, using the observational data of four pointings of 30' offset regions, together with the data from the central region. Thanks to the Hard X-ray Detector (HXD-PIN: 10 - 60 keV), Suzaku can determine the temperature of hot galaxy clusters. We performed t…