Search Publications
Hinode Observations of the Onset Stage of a Solar Filament Eruption
Narukage, Noriyuki; Kano, Ryohei; Sakao, Taro +12 more
We used Hinode X-Ray Telescope (XRT) and Solar Optical Telescope (SOT) filtergraph (FG) Stokes-V magnetogram observations, to study the early onset of a solar eruption that includes an erupting filament that we observe in TRACE EUV images. The filament undergoes a slow rise for at least 20min prior to its fast eruption and strong soft X-ray (SXR) …
Suzaku Spectroscopic Study of Hard X-Ray Emission in the Arches Cluster
Tsujimoto, Masahiro; Koyama, Katsuji; Hyodo, Yoshiaki
We present the results of a Suzaku study of the Arches cluster in the Galactic center region. A high signal-to-noise ratio spectrum in the 3-12keV band was obtained with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku observatory. We found that the spectrum consists of a thermal plasma, a hard power-law tail, and two Gaussian line componen…
Near-Infrared Polarimetry of the Eagle Nebula (M 16)
Tamura, Motohide; Hashimoto, Jun; Kusakabe, Nobuhiko +10 more
We carried out deep and wide (∼ 8 × 8) JHKs imaging polarimetry in the southern region of the Eagle Nebula (M 16). The polarization intensity map reveals that two YSOs with near-IR reflection nebulae are located at the tips of two famous molecular pillars (Pillars 1 and 2) facing toward the exciting stars of M 16. The centrosymmetric po…
Multi-Wavelength Analysis of 18 µm-Selected Galaxies in the AKARI/Infrared-Camera monitor fieldtowards the North Ecliptic Pole
Im, M.; Lee, H. M.; Serjeant, S. +25 more
We present an initial analysis of AKARI 18z Ultra-Luminous InfraRed Galaxies, and a large variation of the PAH inter-band strength ratio in galaxies at high redshifts.
Nature of Infrared Sources in 11 µm Selected Sample from Early Data of the AKARI North Ecliptic Pole Deep Survey
Im, M.; Lee, H. M.; Pearson, C. P. +25 more
We present the properties of 11 10^{12} L_{⊙} based on detailed modelling of the SEDs. We also find four AGNs lying at various redshifts in the main sample. In addition, we discuss a few sources that have non-typical SEDs of the main sample, including a brown-dwarf candidate, a steep power-law source, a flat-spectrum object, and an early-type gala…
Infrared Camera (IRC) Deep Survey in the Performance-Verification Phase
Pearson, C. P.; Ohyama, Y.; Takagi, T. +17 more
We report on the first results of a near- and mid-infrared deep survey with the Infrared Camera (IRC) onboard AKARI in the performance-verification phase. Simultaneous observations by the Near-InfraRed (NIR), Mid-InfraRed Short (MIR-S), and Mid-InfraRed Long (MIR-L) channels of the IRC with effective integration times of 4529, 4908, and 4417 secon…
AKARI Observations of Circumstellar Dust in the Globular Clusters NGC 104 and NGC 362
Ohyama, Y.; Matsunaga, N.; Takagi, T. +19 more
We report on preliminary results of AKARI observations of two globular clusters, NGC 104 and NGC 362. Imaging data covering areas of about 10 F_{7} ratio being greater than unity in NGC 362. Six out of the eight have no 2MASS counterparts. However, we found no such source in NGC 104.
A NewModel for the Structure of the DACs and SACs Regions in the Oe and Be Stellar Atmospheres
Antoniou, A.; Danezis, E.; Lyratzi, E. +4 more
In this paper we present a new mathematical model for the density regions where a specific spectral line and its SACs/DACs are created in the Oe and Be stellar atmospheres. In the calculations of final spectral line function we consider that the main reasons of the line broadening are the rotation of the density regions creating the spectral line …
Wavelength Determination for Solar Features Observed by the EUV Imaging Spectrometer on Hinode
Doschek, George A.; Hara, Hirohisa; Culhane, Len +10 more
A wavelength calibration of solar lines observed by the high resolution EUV Imaging Spectrometer (EIS) on the Hinode satellite is reported. Spectral features of the quiet sun and of two mildly active areas were measured and calibrated. A listing of the stronger observed lines with identification of the leading contributor ions is presented. 41 lin…
Diagnostics of Radio Fine Structures around 3 GHz with Hinode Data in the Impulsive Phase of an X3.4/4B Flare Event on 2006 December 13
Chen, Bin; Sakurai, Takashi; Yan, Yihua +1 more
On 2006 December 13 during the solar minimum, the superactive region NOAA 10930 at the S05W33 disk location produced an X3.4/4B flare at 02:40UT. Fine structures were observed in the radio spectra, which included spikes, reverse slope-type III bursts, type-U burst, V-shaped burst, pulsations, zebra patterns, and firstly discovered sub-second spiky…