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CaII K Spectral Study of an Emerging Flux Region using the Domeless Solar Telescope in Hida Observatory
Matsumoto, Takuma; Shibata, Kazunari; Ichimoto, Kiyoshi +5 more
A cooperative observation with Hida Observatory and the Hinode satellite was performed on an emerging flux region. Successive CaII K spectro-heliograms of the emerging flux region were taken by the Domeless Solar Telescope of Hida Observatory. Hinode observed the emerging flux region with CaII H and FeI Stokes IQUV filtergrams. In this study, deta…
Calibration of the AKARI Far-Infrared Imaging Fourier-Transform Spectrometer
Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +16 more
The Far-Infrared Surveyor (FIS) onboard the AKARI satellite has a spectroscopic capability provided by a Fourier transform spectrometer (FIS-FTS). FIS-FTS is the first space-borne imaging FTS dedicated to far-infrared astronomical observations. We describe the calibration process of the FIS-FTS, and discuss its accuracy and reliability. The calibr…
Time-Resolved Spectral Variability of the Prompt Emission from GRB 070125 Observed with Suzaku/WAM
Gandhi, Poshak; Yamaoka, Kazutaka; Fukazawa, Yasushi +12 more
Time-resolved spectral analyses of GRB 070125 with significant photon detections over the MeV regime using Suzaku/WAM data are reported. The prompt emission interval was divided into 10 time regions, and their spectra were reproduced by a Band function or a cutoff power-law model. The spectra show a complex evolution; a soft-hard-soft trend is see…
Spectroscopic Studies of Limb Spicules. I Radial and Turbulent Velocities
Shoji, Makiko; Nishikawa, Takara; Kitai, Reizaburo +1 more
We made high-resolution spectroscopic observations of limb spicules in Hα using the Vertical Spectrograph of Domeless Solar Telescope at Hida Observatory. While more than half of the observed spicules have Gaussian line-profiles, some spicules have distinctly asymmetric profiles, which can be fitted to two Gaussian components. The faster component…
A New Candidate of a Cluster of Galaxies, 2XMM J045637.2+522411
Ueno, Masaru; Koyama, Katsuji; Bamba, Aya +1 more
We present XMM-Newton and Suzaku results of an X-ray source, 2XMM J045637.2+522411, found during an observation of a galactic supernova remnant (SNR), G156.2+5.7. By comparing its radial profile with the point-spread function, we found that 2XMM J045637.2+522411 is an extended source. X-ray spectra exhibited a line-like structure at 5.7-5.8 keV. S…
Suzaku Observations of the Supernova Remnant N23 in the Large Magellanic Cloud
Ishida, Manabu; Bamba, Aya; Someya, Kentaro
X-ray emission from the supernova remnant N23 in the Large Magellanic Cloud (LMC) has been studied using the X-ray Imaging Spectrometer (XIS) onboard Suzaku. Thanks to a superior energy resolution of the XIS in the soft X-ray band, we resolved H-like and He-like Oxygen K
On the Relation between Surge Activities and a Photospheric Horizontal Velocity Field
Kitai, Reizaburo
A photospheric horizontal velocity field was observed in an active region, NOAA 8375, which showed high Hα surge activities on 1998 November 6. From analyses of Hα images, the photospheric horizontal velocity field, and the magnetic field in and around the active region, we found the following: (1) Meso-granular or supergranular photospheric horiz…