Search Publications
Running Umbral Waves Observed with Hinode
Liang, Hongfei; Li, Haidong; Zhao, Li +2 more
Observations of the main sunspot of NOAA 10953 were carried out with the Solar Optical Telescope aboard Hinode with the line Ca II H on 2007 April 30. The high-cadence (up to 10 s) Ca II H intensity images permit us to elaborate on the nature of umbral oscillations. It is found there are 19 wave sources within the sunspot and 82 running umbral wav…
A Large X-Ray Flare from a Single Weak-Lined T Tauri Star TWA-7 Detected with MAXI GSC
Isobe, Naoki; Yamaoka, Kazutaka; Nakagawa, Yujin E. +35 more
We present a large X-ray flare from a nearby weak-lined T Tauri star TWA-7 detected with the Gas Slit Camera (GSC) on the Monitor of All-sky X-ray Image (MAXI). The GSC captured X-ray flaring from TWA-7 with a flux of 3
Suzaku Observation of the Unidentified Very High Energy Gamma-Ray Source HESS J1702-420
Dotani, Tadayasu; Bamba, Aya; Ozaki, Masanobu +6 more
A deep X-ray observation of the unidentified very high energy (VHE) gamma-ray source HESS J1702
Infrared Spectral Energy Distribution of Galaxies in the AKARI All Sky Survey: Correlations with Galaxy Properties, and Their Physical Origin
Takeuchi, Tsutomu T.; Makiya, Ryu; Totani, Tomonori +2 more
We have studied the properties of more than 1600 low-redshift galaxies by utilizing high-quality infrared flux measurements of the AKARI All-Sky Survey and physical quantities based on optical and 21-cm observations. Our goal is to understand the physics determining the infrared spectral energy distribution (SED). The ratio of the total infrared l…
Suzaku X-Ray Follow-Up Observation of Weak-Lensing-Detected Halos in the Field around ZwCl 0823.2+0425
Smith, Graham P.; Babul, Arif; Nakazawa, Kazuhiro +6 more
We present the results of a Suzaku X-ray follow-up observation of weak-lensing-detected halos in the field around galaxy cluster ZwCl 0823.2+0425. We clearly detected X-ray emission associated with most of these halos, and determined their detailed physical parameters, such as the X-ray luminosity, temperature, and metal abundance, for the first t…
A New X-Ray Spectro-Temporal Analysis Method and Its Application to the Suzaku MCG -6-30-15 Data
Ebisawa, Ken; Inoue, Hajime; Miyakawa, Takehiro
A new X-ray spectro-temporal data-analysis method, which we call "the difference variation function method", is introduced. It can analyze spectral and temporal variations of X-ray sources, and its merits are discussed in comparison with conventional data-analysis methods. The new method is being applied to Suzaku observation data of the Seyfert 1…
Nature of the Unidentified TeV Source HESS J1614-518, Revealed by Suzaku and XMM-Newton Observations
Matsumoto, Hironori; Sakai, Michito; Yajima, Yukie
We report on new Suzaku and XMM-Newton results concerning HESS J1614
A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera
Wada, Takehiko; Tsumura, Kohji
We developed a new method for estimating the dark current of near-infrared (NIR) data from the Infra-Red Camera (IRC) aboard the AKARI satellite. The existing method of dark-current estimation is insufficient because the dark current is enhanced by charged particles hitting the detector in the South Atlantic Anomaly (SAA). We could trace this dark…
No X-Ray Excess from the HESS J1741-302 Region, except for a New Intermediate Polar Candidate
Koyama, Katsuji; Matsumoto, Hironori; Uchiyama, Hideki +3 more
With the Suzaku satellite, we observed an unidentified TeV gamma-ray source, HESS J1741
Near-Infrared and X-Ray Observations of XSS J12270-4859
Ishida, Manabu; Gandhi, Poshak; Tsujimoto, Masahiro +5 more
XSS J12270