Search Publications
(25143) Itokawa: The power of radiometric techniques for the interpretation of remote thermal observations in the light of the Hayabusa rendezvous results*
Hasegawa, Sunao; Usui, Fumihiko; Müller, Thomas G.
The near-Earth asteroid (25143) Itokawa was characterized in great detail by the Japanese Hayabusa mission. We revisited the available thermal observations in the light of the true asteroid properties with the goal of evaluating the possibilities and limitations of thermal model techniques. In total, we used 25 published ground-based mid-infrared …
The AKARI Far-Infrared Surveyor young stellar object catalog
Tamura, Motohide; Kawamura, Akiko; Marton, Gábor +6 more
We demonstrate the use of the AKARI all-sky survey photometric data in the study of galactic star formation. Our aim was to select young stellar objects (YSOs) in the AKARI Far-Infrared Surveyor (FIS) Bright Source Catalogue. We used AKARI/FIS and Wide-field Infrared Survey Explorer (WISE) data to derive mid- and far-infrared colors of YSOs. Class…
A comparative study of infrared asteroid surveys: IRAS, AKARI, and WISE
Hasegawa, Sunao; Usui, Fumihiko; Ootsubo, Takafumi +2 more
We present a comparative study of three infrared asteroid surveys based on the size and albedo data from the Infrared Astronomical Satellite (IRAS), the Japanese infrared satellite AKARI, and the Wide-field Infrared Survey Explorer (WISE). Our study showed that: (i) the total number of asteroids detected with diameter and albedo information with t…
VLBI observations of H2O maser annual parallax and proper motion in IRAS 20143+3634: Reflection on the Galactic constants
Hayashi, Masahiko; Nakagawa, Akiharu; Omodaka, Toshihiro +8 more
We report the results of very long baseline interferometry (VLBI) observations of H2O masers in the IRAS 20143+3634 star-forming region (SFR) using VERA (VLBI Exploration of Radio Astrometry). By tracking masers for a period of over two years we measured a trigonometric parallax of π = 0.367 ± 0.037 mas, corresponding to a source distan…
AKARI infrared camera observations of the 3.3 µm PAH feature in Swift/BAT AGNs
Nakagawa, Takao; Shirahata, Mai; Oyabu, Shinki +6 more
We explore the relationships between the 3.3 µm polycyclic aromatic hydrocarbon (PAH) feature and active galactic nucleus (AGN) properties of a sample of 54 hard X-ray selected bright AGNs, including both Seyfert 1 and Seyfert 2 type objects, using the InfraRed Camera (IRC) on board the infrared astronomical satellite AKARI. The sample is se…
Point source calibration of the AKARI/FIS all-sky survey maps for stacking analysis
Doi, Yasuo; Takita, Satoshi; Arimatsu, Ko +5 more
Investigations of the point spread functions (PSFs) and flux calibrations for stacking analysis have been performed with the far-infrared (wavelength range of 60 to 140 µm) all-sky maps taken by the Far-Infrared Surveyor (FIS) on board the AKARI satellite. The PSFs are investigated by stacking the maps at the positions of standard stars with…