Search Publications
The AKARI far-infrared all-sky survey maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +15 more
We present a far-infrared all-sky atlas from a sensitive all-sky survey using the Japanese AKARI satellite. The survey covers > 99% of the sky in four photometric bands centred at 65 µm, 90 µm, 140 µm, and 160 µm, with spatial resolutions ranging from 1' to 1{^''.}5. These data provide crucial information on t…
An X-ray spectroscopic search for dark matter in the Perseus cluster with Suzaku
Maeda, Yoshitomo; Iizuka, Ryo; Mitsuda, Kazuhisa +2 more
We present the results from deep Suzaku observations of the central region of the Perseus cluster. Bulbul et al. (2014, ApJ, 789, 13) reported the detection by XMM-Newton instruments of an unidentified X-ray emission line at an energy around 3.5 keV in spectra for the Perseus and other clusters. They argued for a possibility of the decay of steril…
High-resolution ALMA observations of SDP.81. I. The innermost mass profile of the lensing elliptical galaxy probed by 30 milli-arcsecond images
Tamura, Yoichi; Oguri, Masamune; Hayashi, Masao +3 more
We report the detailed modeling of the mass profile of a z = 0.2999 massive elliptical galaxy using 30 milli-arcsecond resolution 1 mm Atacama Large Millimeter/submillimeter Array (ALMA) images of the galaxy-galaxy lensing system SDP.81. The detailed morphology of the lensed multiple images of the z = 3.042 infrared-luminous galaxy, which is found…
Calibration of the AKARI far-infrared all-sky survey maps
Nakagawa, Takao; Doi, Yasuo; Takita, Satoshi +10 more
We present an initial analysis of the properties of an all-sky image obtained by the Far-Infrared Surveyor (FIS) onboard the AKARI satellite, at 65 µm (N60), 90 µm (WIDE-S), 140 µm (WIDE-L), and 160 µm (N160). An absolute flux calibration was determined by comparing the data with COBE/DIRBE data sets; the intensity range wa…
High-resolution ALMA observations of SDP.81. II. Molecular clump properties of a lensed submillimeter galaxy at z = 3.042
Tamura, Yoichi; Oguri, Masamune; Hayashi, Masao +3 more
We present spatially resolved properties of molecular gas and dust in a gravitationally lensed submillimeter galaxy H-ATLAS J090311.6+003906 (SDP.81) at z = 3.042 revealed by the Atacama Large Millimeter/submillimeter Array (ALMA). We identified 14 molecular clumps in the CO(5-4) line data. The surface density of molecular gas (Σ _H_2) and star-fo…
Suzaku observations of the galaxy cluster 1RXS J0603.3+4214: Implications of particle acceleration processes in the "Toothbrush" radio relic
Ohashi, Takaya; Takizawa, Motokazu; Akamatsu, Hiroki +4 more
We present the results of Suzaku observations of the galaxy cluster 1RXS J0603.3+4214 with the "Toothbrush" radio relic. Although a shock with Mach number M ≃ 4 is expected at the outer edge of the relic from the radio observation, our temperature measurements of the intracluster medium indicate a weaker temperature difference than expected. The M…
The Subaru-XMM-Newton Deep Survey (SXDS). VIII. Multi-wavelength identification, optical/NIR spectroscopic properties, and photometric redshifts of X-ray sources†
Ouchi, Masami; Simpson, Chris; Curtis-Lake, Emma +27 more
We report on the multi-wavelength identification of the X-ray sources found in the Subaru-XMM-Newton Deep Survey (SXDS) using deep imaging data covering the wavelength range between the far-UV and mid-IR (MIR). We select a primary counterpart of each X-ray source by applying the likelihood ratio method to R-band, 3.6 µm, near-UV, and 24 &mic…
The photospheric Poynting flux and coronal heating
Welsch, Brian T.
Some models of coronal heating suppose that convective motions at the photosphere shuffle the footpoints of coronal magnetic fields and thereby inject sufficient magnetic energy upward to account for observed coronal and chromospheric energy losses in active regions. Using high-resolution observations of plage magnetic fields made with the Solar O…
Suzaku monitoring of the Wolf-Rayet binary WR 140 around periastron passage: An approach for quantifying the wind parameters
Hamaguchi, Kenji; Sugawara, Yasuharu; Maeda, Yoshitomo +7 more
Suzaku observations of the Wolf-Rayet (W-R) binary WR 140 (WC7pd+O5.5fc) were made at four different times around periastron passage in 2009 January. The spectra changed in shape and flux with the phase. As periastron approached, the column density of the low-energy absorption increased, which indicates that the emission from the wind-wind collisi…
Suzaku studies of the supernova remnant CTB 109 hosting the magnetar 1E 2259+586
Enoto, Teruaki; Makishima, Kazuo; Kaneda, Hidehiro +4 more
Ages of the magnetar 1E 2259+586 and the associated supernova remnant CTB 109 were studied. Analyzing the Suzaku data of CTB 109, its age was estimated to be ∼ 14 kyr, which is much younger than the measured characteristic age of 1E 2259+586, 230 kyr. This reconfirms the previously reported age discrepancy of this magnetar/remnant association, and…