Line-of-sight Shell Structure of the Cygnus Loop (2009)
Uchida, Hiroyuki, Tsunemi, Hiroshi, Katsuda, Satoru, Kimura, Masashi, Kosugi, Hiroko, Takahashi, Hiroaki
We conducted a comprehensive study on the shell structure of the Cygnus Loop using 41 observation data obtained by the Suzaku and the XMM-Newton satellites. To investigate the detailed plasma...
Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events (2009)
Hiroshi Tsunemi, Christopher Baluta, David N. Burrows, Gordon P. Garmire, George Chartas
The position accuracy of X-ray photons on a CCD detector is generally believed to be limited by the CCD pixel size. While this is true in general, the position accuracy for X-ray events which deposit...
The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images (2009)
Matsuoka, Masaru, Kawasaki, Kazuyoshi, Ueno, Shiro, Tomida, Hiroshi, Kohama, Mitsuhiro, Suzuki, Motoko, ...
The MAXI (Monitor of All-sky X-ray Image) mission is the first astronomical payload to be installed on the Japanese Experiment Module-Exposed Facility (JEM-EF) on the ISS. It is scheduled for launch...
Katsuda, Satoru, Petre, Robert, Hwang, Una, Yamaguchi, Hiroya, Mori, Koji, Tsunemi, Hiroshi
We present results from X-ray analysis of a Galactic middle-aged supernova remnant (SNR) G156.2+5.7 which is bright and largely extended in X-ray wavelengths, showing a clear circular shape (radius...
The Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop (2009)
Uchida, Hiroyuki, Tsunemi, Hiroshi, Katsuda, Satoru, Kimura, Masashi, Kosugi, Hiroko, Takahashi, Hiroaki
We observed the northern rim of the Cygnus Loop with the \textit{Suzaku} observatory in 5 pointings (P21-P25). From the spatially resolved analysis, all the spectra are well fitted by the single...
The Ejecta Distributions of the Heavy Elements in the Cygnus Loop (2009)
Uchida, Hiroyuki, Tsunemi, Hiroshi, Katsuda, Satoru, Kimura, Masashi, Kosugi, Hiroko
We analyzed the metal distribution of the Cygnus Loop using 14 and 7 pointings observation data obtained by the \textit{Suzaku} and the \textit{XMM-Newton} observatories. The spectral analysis shows...
Katsuda, Satoru, Petre, Robert, Long, Knox S., Reynolds, Stephen P., Winkler, P. Frank, Mori, Koji, ...
We report on the first X-ray proper-motion measurements of the nonthermally-dominated forward shock in the northeastern limb of SN 1006, based on two Chandra observations taken in 2000 and 2008. We...
Forward Shock Proper Motions of Kepler's Supernova Remnant (2008)
Katsuda, Satoru, Tsunemi, Hiroshi, Uchida, Hiroyuki, Kimura, Masashi
The X-ray structure of Kepler's supernova remnant shows a rounded shape delineated by forward shocks. We measure proper motions of the forward shocks on overall rims of the remnant, by using archival...
Another Abundance Inhomogeneity in the South East Limb of the Cygnus Loop (2008)
Tsunemi, Hiroshi, Kimura, Masashi, Uchida, Hiroyuki, Mori, Koji, Katsuda, Satoru
We have observed the south-east (SE) limb of the Cygnus Loop with {\it Suzaku}. Our spatially-resolved spectroscopic study shows that a one-$kT_\mathrm{e}$ non-equilibrium ionization model represents...
Suzaku Observations across the Cygnus Loop from the Northeastern to the Southwestern Rim (2008)
Kimura, Masashi, Tsunemi, Hiroshi, Katsuda, Satoru, Uchida, Hiroyuki
We have observed the Cygnus Loop from the northeast (NE) rim to the southwest (SW) rim using Suzaku in 10 pointings that is just north of previous XMM-Newton observations. The observation data...
Uchiyama, Hideki, Ozawa, Midori, Matsumoto, Hironori, Tsuru, Takeshi Go, Koyama, Katsuji, Kimura, Masashi, ...
The charge transfer inefficiency (CTI) of the X-ray CCDs on board the Suzaku satellite (X-ray Imaging Spectrometers; XIS) has increased since the launch due to radiation damage, and the energy...
Ozawa, Midori, Uchiyama, Hideki, Matsumoto, Hironori, Nakajima, Hiroshi, Koyama, Katsuji, Tsuru, Takeshi Go, ...
The X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite is an X-ray CCD camera system that has superior performance such as a low background, high quantum efficiency, and good energy...
Uchida, Hiroyuki, Tsunemi, Hiroshi, Katsuda, Satoru, Kimura, Masashi
We observed the southwestern region of the Cygnus Loop in two pointings with \textit{XMM-Newton}. The region observed is called the "blow-out" region that is extended further in the south. The origin...
Chandra Observations of the Northeastern Rim of the Cygnus Loop (2008)
Katsuda, Satoru, Tsunemi, Hiroshi, Kimura, Masashi, Mori, Koji
We present results from spatially resolved spectral analyses of the northeastern (NE) rim of the Cygnus Loop supernova remnant (SNR) based on two Chandra observations. One pointing includes northern...
Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku (2008)
Tawa, Noriaki, Hayashida, Kiyoshi, Nagai, Masaaki, Nakamoto, Hajime, Tsunemi, Hiroshi, Yamaguchi, Hiroya, ...
One of the advantages of the X-ray Imaging Spectrometer (XIS) system on board Suzaku is its low and stable non-X-ray background (NXB). In order to make the best use of this advantage, modeling the...
The Plasma Structure of the Cygnus Loop from the Northeastern Rim to the Southwestern Rim (2007)
Tsunemi, Hiroshi, Katsuda, Satoru, Nemes, Norbert, Miller, Eric D.
The Cygnus Loop was observed from the northeast to the southwest with XMM-Newton. We divided the observed region into two parts, the north path and the south path, and studied the X-ray spectra along...
Development of an n-channel CCD, CCD-NeXT1, for Soft X-ray Imager onboard the NeXT satellite (2007)
Takagi, Shin-ichiro, Tsuru, Takeshi Go, Inui, Tatsuya, Matsumoto, Hironori, Koyama, Katsuji, Ozawa, Hideki, ...
NeXT (New X-ray Telescope) is the next Japanese X-ray astronomical satellite mission after the Suzaku satellite. NeXT aims to perform wide band imaging spectroscopy. Due to the successful development...
Suzaku Observations of the North Polar Spur: Evidence for Nitrogen Enhancement (2007)
Miller, Eric D., Tsunemi, Hiroshi, Bautz, Mark W., McCammon, Dan, Fujimoto, Ryuichi, Hughes, John P., ...
We present observations of the North Polar Spur (NPS) using the X-ray Imaging Spectrometer (XIS) aboard the Suzaku X-ray satellite. The NPS is a large region of enhanced soft X-ray and radio emission...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Spatially Resolved Spectral Analysis of Vela Shrapnel D (2005)
Katsuda, Satoru, Tsunemi, Hiroshi
The ROSAT all-sky survey discovered several `shrapnels', showing boomerang structures outside the Vela supernova remnant. We observed shrapnel D with the XMM-Newton satellite. There is an X-ray...
Early BVRcIc imaging and the discovery of the optical afterglow of GRB 041218 (2005)
Torii, Ken'ichi, Fukazawa, Yuuichi, Tsunemi, Hiroshi
We report early BVRcIc imaging of the INTEGRAL GRB 041218. The observation started 129 s after the burst and a sequence of exposures in V, Rc, Ic, and B bands were repeated. The optical afterglow is...
Observation of Kes 27: A Typical Mixed-Morphology SNR (2002)
Enoguchi, Hideyuki, Tsunemi, Hiroshi, Miyata, Emi, Yoshita, Kumi
We report here on the observation of Kes 27, a proto-typical mixed-morphology SNR, using ASCA. It clearly shows a filled-center structure in the X-ray region while a shell structure in the radio...
Improvement of the Spatial Resolution of the ACIS Using Split Pixel Events (2001)
Tsunemi, Hiroshi, Mori, Koji, Miyata, Emi, Baluta, Christopher, Burrows, David N., Garmire, Gordon P., ...
The position accuracy of X-ray photons on a CCD detector is generally believed to be limited by the CCD pixel size. While this is true in general, the position accuracy for X-ray events which deposit...
Reflection Shocked Gas in the Cygnus Loop Supernova Remnant (2001)
We performed spectroscopic X-ray observations of the eastern and northern regions of the Cygnus Loop with the ASCA observatory. The X-ray surface brightness of these regions shows a complex structure...
The X-Ray Structure of the Supernova Remnant 3C 400.2 (2001)
Yoshita, Kumi, Tsunemi, Hiroshi, Miyata, Emi, Mori, Koji
We present here the results of an X-ray study of the supernova remnant 3C 400.2 (G53.6-2.2) using the ASCA data. 3C 400.2 has an unusual morphology at radio wavelengths, suggesting two SNRs...
On the Nature of AX J2049.6+2939 and AX J2050.0+2914 (2000)
Miyata, Emi, Ohta, Kouji, Torii, Kenichi, Takeshima, Toshiaki, Tsunemi, Hiroshi, Hasegawa, Takashi, ...
AX J2049.6+2939 is a compact X-ray source in the vicinity of the southern blow-up region of the Cygnus Loop supernova remnant (Miyata et al. 1998a). This source was the brightest X-ray source inside...
RXJ 0852.0-0462: Another Nonthermal Shell-Type SNR (G266.2-1.2) (2000)
Slane, Patrick, Hughes, John P., Edgar, Richard J., Plucinsky, Paul P., Miyata, Emi, Tsunemi, Hiroshi, ...
The newly discovered supernova remnant G266.2-1.2 (RX J0852.0--0462), along the line of sight to the Vela SNR, was observed with ASCA for 120 ks. We find that the X-ray spectrum is featureless, and...
Discovery of a New Supernova Remnant in the Direction of G69.7+1.0 (2000)
Yoshita, Kumi, Miyata, Emi, Tsunemi, Hiroshi
We discovered a middle-aged supernova remnant (SNR) in the vicinity of G69.7+1.0 using the ASCA satellite. G69.7+1.0 was identified in the 2.7 GHz survey and classified as a shell-type SNR with a...
ASCA Observation of the Crab-Like Supernova Remnant 3C58 (2000)
Torii, Ken'ichi, Slane, Patrick O., Kinugasa, Kenzo, Hashimotodani, Kiyoshi, Tsunemi, Hiroshi
We present here the X-ray observation of a Crab-like supernova remnant (SNR) 3C58 with ASCA. We find that the integrated energy spectrum over the nebula is consistent with previous results, showing a...
Tsunemi, Hiroshi, Miyata, Emi, Aschenbach, Bernd, Hiraga, Junko, Akutsu, Daisuke
Recently, COMPTEL has detected $\gamma$-rays of 1157 keV from $^{44}$Ti in the direction of the SNR RX J0852$-$4622 (Iyudin et al. 1998). Since $^{44}$Ti is a product of explosive nucleosynthesis and...
We observed the North-East (NE) Limb toward the center region of the Cygnus Loop with the ASCA Observatory. We found a radial variation of electron temperature (kTe) and ionization timescale...