Search Publications
Absolute Photometric Calibration of the Infrared Camera (IRC) aboard AKARI
Oyabu, Shinki; Ohyama, Youichi; Onaka, Takashi +11 more
The absolute photometric calibration of imaging observations with the Infrared Camera (IRC) aboard the AKARI satellite was performed by monitoring the same stars regularly and by observing aset of standard stars. By our monitoring observations, we confirmed that all channels of the IRC were stable to within 4% and that their sensitivities were con…
AKARI/FIS Mapping of the ISM-Wind Bow Shock around α Orionis
Yamamura, Issei; Matsunaga, Noriyuki; Mito, Hiroyuki +7 more
We present 10' × 50'scan maps around an M supergiant αOri at 65, 90, 140, and 160µm obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution permit us to fit the de-projected shape of the stellar-wind bow shock around αOri to have a stand-off distance of 4'.8, position angle of 55°…
Albedo, Size, and Surface Characteristics of Hayabusa-2 Sample-Return Target 162173 1999 JU3 from AKARI and Subaru Observations
Müller, T. G.; Wada, T.; Ita, Y. +7 more
Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters
Sarazin, Craig L.; Reiprich, Thomas H.; Hayashida, Kiyoshi +6 more
We present the analysis of a Suzaku observation of the Ophiuchus galaxy cluster. We confirmed that the cluster has a cool core. While the temperature of the intracluster medium (ICM) decreases toward the center, the metal abundance increases. Except for the core (r lesssim 50kpc), the cluster is hot (∼9-10keV) and is almost isothermal for r lesssi…
Suzaku Observations of AWM 7 Cluster of Galaxies: Temperatures, Abundances, and Bulk Motions
Ishida, Manabu; Sato, Kosuke; Ohashi, Takaya +4 more
We carried out 3 observations of the cluster of galaxies AWM 7, for the central region and 20'-east and 20'-west offset regions, with Suzaku. Temperature and abundance profiles were measured out to 27' simeq 570 h70-1kpc, which corresponded to ∼0.35r180. The temperature of the intra-cluster medium (ICM) slightly de…
AKARI IRC Survey of the Large Magellanic Cloud: Outline of the Survey and Initial Results
Hasegawa, Tetsuo; Onaka, Takashi; Tamura, Motohide +13 more
We observed an area of 10deg2 of the Large Magellanic Cloud using the Infrared Camera (IRC) on board AKARI. The observations were carried out using five imaging filters (3, 7, 11, 15, and 24µm) and adispersion prism (2-5µm, λ / Δλ sim 20) equipped in the IRC. This paper describes an outline of our survey project, and present…
Suzaku Wide-Band Observations of SN1006
Petre, Rob; Fukazawa, Yasushi; Kokubun, Motohide +17 more
We report on the wide-band spectra of SN1006, as observed by Suzaku. Thermal and nonthermal emissions were successfully resolved thanks to the excellent spectral response of Suzaku's X-ray CCD XIS. The nonthermal emission could not be reproduced by a simple power-law model, but needed a roll-off at 5.7 × 1016Hz = 0.23keV. The roll-off f…
Cooperative Observation of Ellerman Bombs between the Solar Optical Telescope aboard Hinode and Hida/Domeless Solar Telescope
Matsumoto, Takuma; Shibata, Kazunari; Tsuneta, Saku +13 more
High-resolution CaIIH broad-band filter images of NOAA10933 on 2007 January 5 were obtained by the Solar Optical Telescope aboard the Hinode satellite. Many small-scale (∼1") bright points were observed outside the sunspot and inside the emerging flux region. We identified some of these bright points with Ellerman bombs (EBs) by using Hα images ta…
Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
Dotani, Tadayasu; Yaqoob, Tahir; Yamaoka, Kazutaka +23 more
The Galactic black-hole binary GROJ1655-40, a source harboring superluminal jets, was observed with Suzaku on 2005 September 22-23. The source was detected over a broad and continuous energy range of 0.7-300keV, with an intensity of ∼50mCrab at 20keV. At a distance of 3.2kpc, the 0.7-300keV luminosity was ∼5.2 × 1036 ergs-1 (…
Suzaku Wide-Band X-Ray Spectroscopy of the Seyfert2 AGN in NGC 4945
Done, Chris; Isobe, Naoki; Gandhi, Poshak +13 more
Suzaku observed a nearby Seyfert2 galaxy, NGC 4945, which hosts one of the brightest active galactic nuclei above 20keV. Combining data from the two detectors aboard Suzaku, the AGN intrinsic nuclear emission and its reprocessed signals were observed simultaneously. The intrinsic emission is highly obscured with an absorbing column of ∼5×1024…