Search Publications
X-Ray Study of Rekindled Accretion in the Classical Nova V2491 Cygni
Drake, Jeremy J.; Tsujimoto, Masahiro; Ness, Jan-Uwe +5 more
We conducted an X-ray spectroscopic study of the classical nova V2491 Cygni using our target-of-opportunity observation data with the Suzaku and XMM-Newton satellites as well as archived data with the Swift satellite. Medium-resolution (
MOIRCS Deep Survey. VII. NIR Morphologies of Star-Forming Galaxies at Redshift z 1
Ouchi, Masami; Tanaka, Ichi; Yamada, Toru +11 more
We investigated rest-frame near-infrared (NIR) morphologies of a sample of 139 galaxies with
Observation of the Cygnus OB2 Association with Suzaku and Long-Term Light Curves
Kitamoto, Shunji; Murakami, Hiroshi; Yoshida, Masaki
We obtained a Suzaku 41-ks observation of the four brightest early type stars in the Cygnus OB2 association (Cyg OB2 Nos. 5, 8a, 9, and 12). The spectra of two of the stars, Nos. 9 and 12, could be fitted by a two-temperature thin-thermal collisional-ionization equilibrium model, while those of Nos. 5 and 8a required a three-temperature model. Sta…
X-Ray Observation of Mars at Solar Minimum with Suzaku
Ezoe, Yuichiro; Ishikawa, Kumi; Ohashi, Takaya +2 more
Mars was observed in X-rays during 2008 April 3-5 for 82 ks with the Japanese Suzaku observatory. Mars has been known to emit X-rays via the scattering of solar X-rays and via charge exchange between neutral atoms in the exosphere and solar-wind ions. Past theoretical studies suggest that the exospheric neutral density may vary by a factor of up t…
Suzaku Discovery of Twin Thermal Plasma from the Tornado Nebula
Koyama, Katsuji; Sawada, Makoto; Go Tsuru, Takeshi +1 more
The Tornado nebula (G357.7
First Detection of Ar-K Line Emission from the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Tominaga, Nozomu +5 more
We observed the Cygnus Loop with XMM-Newton (9 pointings) and Suzaku (32 pointings) between 2002 and 2008. The total effective exposure time is 670.2 ks. By using all of the available data, we intended to improve a signal-to-noise ratio of the spectrum. Accordingly, the accumulated spectra obtained by the XIS and the EPIC show some line features a…
Study of Eclipsing Binary and Multiple Systems in OB Associations. I. Orion OB1a - IM Monocerotis
Bilir, Selçuk; Bakis, Volkan; Bakis, Hicran +5 more
All available photometric and spectroscopic observations were collected and used as the basis of a detailed analysis of the close binary IM Mon. The orbital period of the binary was refined to 1d.19024249 (0.00000014). The Roche equipotentials, fractional luminosities (in Β,V, and Hp-bands) and fractional radii for the component stars i…
A New Candidate of an X-Ray Luminous Cluster of Galaxies behind the Galactic Plane
Koyama, Katsuji; Bamba, Aya; Yamauchi, Shigeo
We present Suzaku results of an X-ray source, AX J185905
X-Ray and Gamma-Ray Emission of the Shell-Type Supernova Remnant RX J1713.7-3946
Zhang, Li; Yang, C. Y.
To study possible origins of high-energy gamma-ray emission from shell-type supernova remnants, RX J1713.7-3946, we model their nonthermal photon spectra from X-ray to very high energy (VHE) gamma-ray bands in the frame of non-linear diffusive shock acceleration, respectively. In our modeling, the accelerated proton spectrum is calculated based on…
X-Ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
Hoshino, Akio; Sato, Kosuke; Fukazawa, Yasushi +14 more
We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A 1413 with Suzaku, whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions. We excised 15 point sources superimposed on the image above a flux of 1 × 10-14erg cm-2s-1