Search Publications
Spectroscopic Confirmation of the Fifth Image of SDSS J1004+4112 and Implications for the MBH--σ* Relation at z = 0.68
Smith, Graham P.; Oguri, Masamune; Sharon, Keren +5 more
We present the results of deep spectroscopy for the central region of the cluster lens SDSSJ 1004+4112 with the Subaru Telescope. A secure detection of an emission line of the faint blue stellar object (component E) near the center of the brightest cluster galaxy (G1) confirms that it is the central fifth image of the lensed quasar system. In addi…
Far-Infrared Properties of Blue Compact Dwarf Galaxies Observed with AKARI/Far-Infrared Surveyor (FIS)
Onaka, Takashi; Kaneda, Hidehiro; Suzuki, Toyoaki +1 more
We report on the basic far-infrared (FIR) properties of eight blue compact dwarf galaxies (BCDs) observed by AKARI. We have measured the fluxes at the four FIS bands (wavelengths of 65 µm, 90 µm, 140 µm, and 160 µm). Based on these fluxes, we have estimated basic quantities of dust: dust temperature, dust mass, and total FI…
2006 December 17 Long Duration Flare Observed with the Hinode EUV Imaging Spectrometer
Harra, Louise K.; Doschek, George A.; Hara, Hirohisa +5 more
A GOES C-class long-duration flare that occurred near the west limb on 2006 December 17 was observed with the Hinode EUV Imaging Spectrometer (EIS) in raster-scan observations. Cusp-shaped arcades are prominent in the spectroheliogram of the CaXVII emission line at 192.86Å. Spatial relationships between hot flare loops with a cusp apex and cool po…
The Symbiotic System SS73 17 Seen with Suzaku
Mukai, Koji; Kallman, Tim; Smith, Randall K. +3 more
We observed with Suzaku the symbiotic star SS73 17, motivated by the discovery by the INTEGRAL satellite and the Swift BAT survey that it emits hard X-rays. Our observations showed a highly-absorbed X-ray spectrum with NH > 1023cm-2, equivalent to AV > 26, although the source has B magnitude 11.3 a…
Suzaku Detection of Extended/Diffuse Hard X-Ray Emission from the Galactic Center
Maeda, Yoshitomo; Kokubun, Motohide; Makishima, Kazuo +12 more
Five on-plane regions within ±0°.8 of the galactic center were observed with the Hard X-ray Detector (HXD) and the X-ray Imaging Spectrometer (XIS) aboard Suzaku. From all regions, significant hard X-ray emission was detected with HXD-PIN up to 40keV, in addition to the extended plasma emission which is dominant in the XIS band. The hard X-ray sig…
Suzaku Observation of the Metallicity in the Hot Interstellar Medium of the Isolated Elliptical Galaxy NGC 720
Fukazawa, Yasushi; Anabuki, Naohisa; Matsushita, Kyoko +3 more
The metal abundances in the interstellar medium of the isolated elliptical galaxy NGC 720 were studied with the CCD X-ray Imaging Spectrometer (XIS) aboard the Suzaku satellite. The high detection efficiency along with the excellent spectral resolution of the XIS allowed the K-shell lines of O and Mg to be clearly resolved, and the abundances of O…
Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region
Nagata, Tetsuya; Tsujimoto, Masahiro; Koyama, Katsuji +5 more
We present the results of a Suzaku study of a bright point-like source in the 6.7keV intensity map of the Galactic center region. We detected an intense FeXXV 6.7keV line with an equivalent width of ∼1keV as well as emission lines of highly ionized Ar and Ca from a spectrum obtained by the X-ray Imaging Spectrometer. The overall spectrum is descri…
Performance of an Imaging Fourier Transform Spectrometer with Photoconductive Detector Arrays: An Application for the AKARI Far-Infrared Instrument
Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +10 more
We have developed an imaging Fourier transform spectrometer (FTS) for space-based far-infrared astronomical observations. The FTS employs newly developed photoconductive detector arrays with acapacitive trans-impedance amplifier, which makes the FTS acompletely unique instrument. The FTS was installed as afunction of the far-infrared instrument (F…
Galaxy Clusters at 0.9 < z < 1.7 in the AKARI NEP Deep Field
Goto, Tomotsugu; Inami, Hanae; Nakagawa, Takao +11 more
There is ahuge gap between the properties of red-sequence selected massive galaxy clusters at z < 1 and Lyman-break selected proto-clusters at z > 3. It is important to understand when and how the z > 3 proto-clusters evolve into passive clusters at z < 1. We aim to fill this cluster desert by using space-based N4 (4 µm) imaging …
Abundance Inhomogeneity in the Northeastern Rim of the Cygnus Loop Revealed by the Suzaku Observatory
Miller, Eric D.; Katsuda, Satoru; Uchida, Hiroyuki +5 more
We present the results of a spatially resolved spectral analysis from four Suzaku observations covering the northeastern rim of the Cygnus Loop. A two-kTe non-ionization equilibrium (NEI) model fairly well represents our data, which confirms the NEI condition of the plasma there. The metal abundances are depleted relative to the solar v…