Search Publications
Hinode's Observational Result on the Saturation of Magnetic Helicity Injected into the Solar Atmosphere and Its Relation to the Occurrence of a Solar Flare
Magara, Tetsuya; Tsuneta, Saku
This paper is intended to present key features of the evolution toward the onset of a solar flare, using Hinode's observations on the photospheric magnetic field. Hinode can provide the temporal development of the photospheric field as a vector quantity, which shows that magnetic shear is initially developed in a flare-productive active region (AR…
VLBI Astrometry of AGB Variables with VERA --- A Semiregular Variable S Crateris ---
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +40 more
We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular …
Suzaku Observations of Hercules X-1: Measurements of the Two Cyclotron Harmonics
Dotani, Tadayasu; Enoto, Teruaki; Kokubun, Motohide +10 more
The accretion-powered pulsar Her X-1 was observed with Suzaku twice in its main-on state, on 2005 October 5--6 and 2006 March 29--30, for a net exposure of 30.5ks and 34.4ks, respectively. In the 2005 and 2006 observations, the source was detected at an average 10--30keV intensity of 290mCrab and 230mCrab, respectively. The intrinsic pulse period …
Wide-Band Spectroscopy of the Compton Thick Seyfert2 Galaxy Markarian 3 with Suzaku
Isobe, Naoki; Kunieda, Hideyo; Okajima, Takashi +15 more
We obtained a wide-band spectrum of the Compton-thick Seyfert2 galaxy Mkn3 with Suzaku. The observed spectrum was clearly resolved into weak, soft power-law emission, a heavily absorbed power-law component, cold reflection, and many emission lines. The heavily absorbed component, absorbed by gas with a column density of 1.1 × 1024 cm
The Suzaku Observation of NGC3516: Complex Absorption and the Broad and Narrow FeK Lines
Fabian, Andrew C.; Kunieda, Hideyo; Okajima, Takashi +10 more
We present results from a 150ks Suzaku observation of the Seyfert 1.5 NGC3516 in 2005 October. The source was in a relatively highly absorbed state. Our best-fit model is consistent with the presence of a low-ionization absorber having a column density near 5×1022 cm-2 and covering most of the X-ray continuum source (covering…
Suzaku Spectroscopy of Extended X-Ray Emission in M17
Hamaguchi, Kenji; Maeda, Yoshitomo; Tsujimoto, Masahiro +5 more
We present the results of a Suzaku spectroscopic study of soft extended X-ray emission in the HII region of M17. The spectrum of the extended emission was obtained with a high signal-to-noise ratio in a spatially resolved manner using the X-ray Imaging Spectrometer (XIS). We established that contamination by unresolved point sources, the Galactic …
Detailed Hard X-Ray Measurements of Nuclear Emission from the Seyfert2 Galaxy NGC4388 with Suzaku
Fukazawa, Yasushi; Murakami, Toshio; Ohno, Masanori +10 more
We report on a Suzaku observation of the nearby Seyfert2 galaxy NGC4388. The overall spectrum is well described by the combination of strongly absorbed power-law plus thin thermal plasma emission, as well as previous observations. Thanks to well-calibrated instruments and a low background level, Suzaku measured the broad-band X-ray spectra more pr…
Supernova Remnants in the AKARI IRC Survey of the Large Magellanic Cloud
Onaka, Takashi; Ita, Yoshifusa; Seok, Ji Yeon +9 more
We present a near- to mid-infared study of supernova remnants (SNRs) using the AKARI IRC Survey of the Large Magellanic Cloud (LMC). The LMC survey observed about a10 square degree area of the LMC in five bands centered at 3, 7, 11, 15, and 24 µm using the Infrared Camera (IRC) aboard AKARI. The number of SNRs in the survey area is 21, which…
Suzaku Observation of the RCW86 Northeastern Shell
Yamaguchi, Hiroya; Koyama, Katsuji; Nakajima, Hiroshi +4 more
This paper reports on Suzaku results concerning the northeast shell of RCW86. With both spatial and spectral analyses, we separated the X-rays into three distinct components: low (kTe ∼ 0.3keV) and high (kTe ∼ 1.8keV) temperature plasmas and a non-thermal component, and discovered that their spatial distributions are differen…
Suzaku Observation of HCG 62: Temperature, Abundance, and Extended Hard X-Ray Emission Profiles
Isobe, Naoki; Hoshino, Akio; Sato, Kosuke +14 more
The compact group of galaxies HCG 62(z = 0.0145) was observed for 120ks with Suzaku XIS and HXD-PIN. The XIS spectra for four annular regions were fitted with a two-temperature vapec model with variable abundance, combined with the foreground Galactic component. The Galactic component was described by a two-temperature apec model, and constrained …