Search Publications
A Super Bubble Candidate in the Galactic Center and a Local Enhancement G359.77-0.09
Mori, Hideyuki; Koyama, Katsuji; Nobukawa, Masayoshi +2 more
A 20' × 16' elliptical ring-like structure has been found near the Galactic center in the narrow energy band corresponding to the Kα line from He-like sulfur. In the ring, two diffuse sources are found, a supernova remnant candidate, G359.79-0.26, and an unidentified source, G359.77-0.09. The X-ray spectrum of G359.77-0.09 is similar to that of G3…
Deconvolution of Images Taken with the Suzaku X-Ray Imaging Spectrometer
Maeda, Yoshitomo; Kamae, Tuneyoshi; Sugizaki, Mutsumi
We present a non-iterative method to deconvolve the point spread function (PSF) from images taken with the Suzaku X-ray Imaging Spectrometer (XIS). The method is optimized for analyses of extended sources with high photon statistics. Suzaku has four XIS detectors, each with its own X-ray CCD and X-Ray Telescope (XRT), and has been providing opport…
Diffuse 18µ Emission around TYC 3159-6-1 Discovered by the AKARI MIR All-Sky Survey
Oyabu, Shinki; Onaka, Takashi; Takita, Satoshi +11 more
We report on observations of the mysterious object TYC 3159-6-1 located toward the Cygnus X region. It shows interesting characteristics in the AKARI mid-infrared All-Sky Survey. The central star is clearly detected as a point source at 9µ, while no point-like source, but a large shell-like structure is seen around the source at 18µ. T…
A Massive Disk Galaxy at z > 3 along the Line of Sight of QSO 1508+5714
Tanaka, Ichi; Yamada, Toru; Iye, Masanori +1 more
We have obtained deep images in the BVRIJHKs bands of the field centered on QSO 1508+5714 5714 (Zem = 4.28) with the Suprime-Cam, FOCAS, and MOIRCS cameras on Subaru telescope. We report here on the detection of a B-dropout galaxy, which is 3.5'' north-west of the QSO sightline. A photometric redshift analysis is presented to complement…
Reproducibility of Non-X-Ray Background for the X-Ray Imaging Spectrometer aboard Suzaku
Dotani, Tadayasu; Miller, Eric D.; Yamaguchi, Hiroya +9 more
One of the advantages of the X-ray Imaging Spectrometer (XIS) system aboard Suzaku is its low and stable non-X-ray background (NXB). In order to make the best use of this advantage, modeling the NXB spectra with high accuracy is important to subtract them from the spectra of on-source observations. We are constructing an NXB database by collecting…
Subaru Weak Lensing Study of Seven Merging Clusters: Distributions of Mass and Baryons
Umetsu, Keiichi; Okabe, Nobuhiro
We present and compare projected distributions of mass, galaxies, and the intracluster medium (ICM) for a sample of merging clusters of galaxies based on a joint weak-lensing, optical photometric, and X-ray analysis. Our sample comprised seven nearby Abell clusters, for which we had conducted systematic, deep imaging observations with Suprime-Cam …
High Metallicity of the X-Ray Gas Up to the Virial Radius of a Binary Cluster of Galaxies: Evidence of Galactic Superwinds at High-Redshift
Reiprich, Thomas H.; Hayashida, Kiyoshi; Matsumoto, Hironori +4 more
We present an analysis of a Suzaku observation of the link region between the galaxy clusters A 399 and A 401. We obtained the metallicity of the intracluster medium (ICM) up to the cluster virial radii for the first time. We determined the metallicity where the virial radii of the two clusters cross each other (∼2 Mpc away from their centers) and…
Suzaku Results on Cygnus X-1 in the Low/Hard State
Done, Chris; Dotani, Tadayasu; Yamaoka, Kazutaka +9 more
The black-hole binary Cygnus X-1 was observed for 17ks with the Suzaku X-ray observatory in 2005 October, while it was in a low/hard state with a 0.7-300keV luminosity of 4.6×1037ergs-1. The XIS and HXD spectra, spanning 0.7--400keV, were reproduced successfully, incorporating a cool accretion disk and a hot Comptonizing coro…
Systematic Infrared 2.5-5 µm Spectroscopy of Nearby Ultraluminous Infrared Galaxies with AKARI
Nakagawa, Takao; Shirahata, Mai; Imanishi, Masatoshi +4 more
We report on the results of systematic infrared 2.5-5 µm spectroscopy of 45 nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.3 using AKARI IRC. This paper investigates whether the luminosities of these ULIRGs are dominated by starburst activity, or alternatively, whether optically elusive buried active galactic nuclei (AGNs) are e…
AKARI/IRC Deep Survey in the North Ecliptic Pole Region
Goto, Tomotsugu; Oyabu, Shinki; Ohyama, Youichi +10 more
We have made adeep and wide imaging survey with all nine AKARI/IRC bands from 2 to 24 µm within ahalf degree of the North Ecliptic Pole. The survey covered acircular area of 0.38deg2 centered at RA = 17h56m, Dec = 66°37' where adeep optical multi-band survey has been conducted by Subaru/Suprime-Cam. The 5σ se…