Search Publications
Spectral Analyses of the Nearest Persistent Ultraluminous X-Ray Source M 33 X-8
Weng, Shan-Shan; Wang, Jun-Xian; Gu, Wei-Min +1 more
We provide a detailed analysis of 12 XMM observations of the nearest persistent extragalactic ultraluminous X-ray source (ULX), M 33 X-8. No significant spectral evolution has been detected for the period of the observations, and therefore we combine the individual observations to increase the signal-to-noise ratio for a spectral fitting. The comb…
Suzaku-WAM, Konus-Wind, and Swift-BAT Observations of Prompt Emission of the High-Redshift GRB 050904
Yamaoka, Kazutaka; Nakagawa, Yujin E.; Ohno, Masanori +12 more
We present the results of the high-redshift GRB 050904 at z = 6.295 from joint spectral analysis among Swift-BAT, Konus-Wind, and Suzaku-WAM, covering a wide energy range of 15--5000keV. The νFu spectrum peak energy, Epeak, was measured at 314+173-89 keV, corresponding to 2291+1263-634
X-Ray Spectroscopy of the Classical Nova V458 Vulpeculae with Suzaku
Drake, Jeremy J.; Tsujimoto, Masahiro; Ness, Jan-Uwe +2 more
We conducted a target of opportunity X-ray observation of the classical nova V458 Vulpeculae 88d after the explosion using the Suzaku satellite. With a ∼20ks exposure, the X-ray Imaging Spectrometer detected X-ray emission significantly harder than typical super-soft source emission. The X-ray spectrum shows Kα lines from N, Ne, Mg, Si, and S, and…
Search for Sc-K Line Emission from RX J0852.0-4622 Supernova Remnant with Suzaku
Petre, Robert; Terada, Yukikatsu; Bamba, Aya +6 more
We searched for evidence of line emission around 4keV from the northwestern rim of the supernova remnant RX J0852.0-4622 using Suzaku XIS data. Several papers have reported on the detection of an emission line around 4.1keV from this region of the sky. This line would arise from K-band fluorescence by 44Sc, the immediate decay product o…
Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +3 more
We observed the northern rim of the Cygnus Loop with the Suzaku observatory in 5 pointings (P21-P25). From a spatially resolved analysis, all of the spectra were well fitted by a single component of the non-equilibrium ionization plasma model. From the best-fit parameters, we found that the abundances of the heavy elements are significantly lower …
Suzaku Observations across the Cygnus Loop from the Northeastern to the Southwestern Rim
Katsuda, Satoru; Uchida, Hiroyuki; Tsunemi, Hiroshi +1 more
We have observed the Cygnus Loop from the northeast (NE) rim to the southwest (SW) rim using Suzaku in 10 pointings just north of previous XMM-Newton observations. The observation data obtained were divided into 45 rectangular regions where the width was configured so that each region would hold 8000-12000photons. The spectrum acquired from each r…
Deep 15µm AKARI Observations in the CDFS: Estimating Dust Luminosities for a MIR-Selected Sample and for Lyman Break Galaxies and the Evolution of Ldust/LUV with the Redshift
Buat, Véronique; Burgarella, Denis; Pearson, Chris +2 more
Deep observations of the Chandra Deep Field South have been secured at 15µm with AKARI/IRC infrared space telescope. From these observations, we define a sample of mid infrared-selected galaxies at 15µm and we also obtain 15µm flux densities for a sample of Lyman Break Galaxies at z ∼ 1 already observed at 24µm with Spitzer…
Spectral Transitions of an Ultraluminous X-Ray Source, NGC 2403 Source 3
Isobe, Naoki; Gandhi, Poshak; Makishima, Kazuo +8 more
A Suzaku observation of an ultraluminous X-ray source, NGC 2403 Source 3, performed on 2006 March 16-17, is reported. The Suzaku XIS spectrum of Source 3 was described as multi-color black-body-like emission from an optically thick accretion disk. The innermost disk temperature and radius were measured to be Tin = 1.08-0.03
Search for Remnant Clouds Associated with the TW Hya Association
Tachihara, Kengo; Fukui, Yasuo; Neuhäuser, Ralph
We report on a search for the parental molecular clouds of the TW Hya association (TWA), using CO emission and NaI absorption lines. TWA is the nearest young (∼50pc; ∼10Myr) stellar association; yet in spite of its youth there has been no detection of any associated natal molecular gas, as is the case with other typical young clusters. Using infra…
Magnetic Structure of Umbral Dots Observed with the Hinode Solar Optical Telescope
Ichimoto, Kiyoshi; Katsukawa, Yukio; Kitai, Reizaburo +1 more
A high-resolution, seeing-free spectroscopic observation of a decaying sunspot was made with the Solar Optical Telescope aboard the Hinode satellite. The target was NOAA 10944, located in the west side of the solar surface from 2007 March 2 to March 4. The umbra included many umbral dots (UDs) with a size of ∼300 km in continuum light. We report o…