Search Publications
Suzaku X-Ray Observations of the Accreting NGC 4839 Group of Galaxies and a Radio Relic in the Coma Cluster
Sarazin, Craig L.; Inoue, Susumu; Akamatsu, Hiroki +3 more
Based on Suzaku X-ray observations, we studied the hot gas around the NGC 4839 group of galaxies and a radio relic in the outskirts of the Coma cluster. We found a gradual decline in the gas temperature from 5 keV around NGC 4839 to 3.6 keV at the radio relic, across which there is a further, steeper drop down to 1.5 keV. This drop as well as the …
An X-Ray Detected Group of Quiescent Early-Type Galaxies at z = 1.6 in the Chandra Deep Field South
Brandt, William N.; Mulchaey, John S.; Ueda, Yoshihiro +6 more
We report the discovery of an X-ray group of galaxies located at a high redshift of
A Relation of the PAH 3.3 µm Feature with Star-forming Activity for Galaxies with a Wide Range of Infrared Luminosity
Oyabu, Shinki; Yamagishi, Mitsuyoshi; Im, Myungshin +4 more
For star-forming galaxies, we investigated a global relation between the polycyclic aromatic hydrocarbon (PAH) emission luminosity at 3.3 µm, LPAH3.3, and the infrared (8-1000 µm) luminosity, LIR, to understand how the PAH 3.3 µm feature relates to star-formation activity. With AKARI, we performed near-infra…
Evidence for Recombining Plasma in the Supernova Remnant G346.6-0.2
Koyama, Katsuji; Nobukawa, Masayoshi; Yamauchi, Shigeo +1 more
We present Suzaku results of the supernova remnant (SNR) G346.6-0.2. The X-ray emission has a center-filled morphology with a size of 67' × 8' within the radio shell. Neither an ionization equilibrium nor non-equilibrium (ionizing) plasma can reproduce the spectra remaining shoulder-like residuals in the 2-4 keV band. These structures are possibly…
Low-Resolution Spectrum of the Diffuse Galactic Light and 3.3µm PAH Emission with the AKARI InfraRed Camera
Sakon, Itsuki; Matsuura, Shuji; Wada, Takehiko +3 more
We first obtained the spectrum of the diffuse Galactic light (DGL) at general interstellar space in the
The 9 and 18 Micrometer Luminosity Functions of Various Types of Galaxies with AKARI: Implication for the Dust Torus Structure of AGN
Oyabu, Shinki; Ohyama, Youichi; Takita, Satoshi +6 more
We present the 9 and 18 µm luminosity functions (LFs) of galaxies at 0.006 ≤ z ≤ 0.8 (with an average redshift of ∼ 0.04) using the AKARI mid-infrared all-sky survey catalog. We selected 243 galaxies at 9 µm and 255 galaxies at 18 µm from the Sloan Digital Sky Survey (SDSS) spectroscopy region. These galaxies were then classified…
Suzaku Observation of Strong Solar-Wind Charge-Exchange Emission from the Terrestrial Exosphere during a Geomagnetic Storm
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +3 more
We present an analysis of X-ray data exhibiting strong solar-wind charge-exchange emission obtained with the Suzaku satellite during a geomagnetic storm that occurred on 2005 August 31. A temporal variation of diffuse soft X-ray emission, correlating with the solar-wind proton flux, was found. The diffuse emission consisted of exospheric solar-win…
An Updated View of Solar Eruptive Flares and the Development of Shocks and CMEs: History of the 2006 December 13 GLE-Productive Extreme Event
Grechnev, Victor V.; Kiselev, Valentin I.; Uralov, Arkadiy M. +2 more
An extreme 2006 December 13 event marked the onset of the Hinode era, being the last major flare in the solar cycle 23 observed with NoRH and NoRP. The event produced a fast CME, strong shock, and a big particle event responsible for GLE70. We endeavor to clarify the relations between the eruptions, shock wave, and flare, and to shed light on a de…
The Asteroid Catalog Using AKARI IRC Slow-Scan Observations
Hasegawa, Sunao; Takita, Satoshi; Usui, Fumihiko +2 more
We present an asteroidal catalog from the mid-infrared wavelength region using the slow-scan observation mode obtained by the Infrared Camera (IRC) on-board the Japanese infrared satellite AKARI. An archive of IRC slow-scan observations comprising about 1000 images was used to search for serendipitous encounters of known asteroids. We have determi…
X-Ray and Optical Monitoring of a Gamma-Ray-Emitting Radio Galaxy, NGC 1275
Fukazawa, Yasushi; Yamazaki, Syoko; Sasada, Mahito +7 more
We performed monitoring observations of a gamma-ray-emitting radio galaxy, NGC 1275, in the X-ray and optical bands with the Suzaku/XIS, Kanata telescope, and the Okayama telescope. The X-ray flux of the nucleus was estimated by imaging spectroscopy in the hard X-ray band. In the optical band, a continuum flux, a broad Hα line flux, and the polari…