Search Publications
Coupling of the magnetic field and gas flows inferred from the net circular polarization in a sunspot penumbra
Ichimoto, Kiyoshi; Shaltout, Abdelrazek M. K.
We analyze penumbral fine structure using high-resolution spectropolarimetric data obtained by the Solar Optical Telescope on board the Hinode satellite. The spatial correlation between the net circular polarization (NCP) and Evershed flow is investigated in detail. Here we obtain that negative NCP structures are correlated with the Evershed flow …
Sub-MeV band observation of a hard burst from AXP 1E 1547.0-5408 with the Suzaku Wide-band All-sky Monitor
Enoto, Teruaki; Yamaoka, Kazutaka; Makishima, Kazuo +10 more
The 2.1-s anomalous X-ray pulsar 1E 1547.0-5408 exhibited an X-ray outburst on 2009 January 22, emitting a large number of short bursts. The wide-band all-sky monitor (WAM) on-board Suzaku detected at least 254 bursts in the 160 keV-6.2 MeV band over the period of January 22 00:57-17:02 UT from the direction of 1E 1547.0-5408. One of these bursts,…
Suzaku observation of X-ray variability in soft state LMC X-1
Makishima, Kazuo; Tashiro, Makoto S.; Terada, Yukikatsu +3 more
This paper reports the results of Suzaku observation of the spectral variation of the black hole binary LMC X-1 in the soft state. The observation was carried out in 2009 from July 21 to 24. the obtained net count rate was ∼ 30 counts s-1 in the 0.5-50 keV band with ∼ 10% peak-to-peak flux variation. The time-averaged X-ray spectrum can…
A study on the mid-infrared sources that dramatically brightened
Matsunaga, Noriyuki; Nakada, Yoshikazu; Ita, Yoshifusa +5 more
We present results of near-infrared (NIR) photometric and spectroscopic observations of mid-infrared (MIR) sources that brightened dramatically. Using Infrared Astronomical Satellite (IRAS), AKARI, and Wide-field Infrared Survey Explorer (WISE) point source catalogs, we found that four sources (IRAS 19574+4941, V2494 Cyg, IRAS 22343+7501, and V583…
An obscured narrow-line Seyfert 1 galaxy candidate, Mrk 1388 with nonthermal jets
Doi, Akihiro
Mrk 1388 has an unusual Seyfert nucleus that shows narrow emission-line components without broad emission-line ones, but shows a strong featureless continuum and strong iron-forbidden, high-ionization emission lines. The apparent coexistence of type-1/2 characteristics is potentially attributed to a heavily obscured broad-line region or to an inte…
Suzaku observations of the old pulsar wind nebula candidate HESS J1356-645
Dotani, Tadayasu; Bamba, Aya; Hiraga, Junko S. +3 more
A largely extended X-ray emission was discovered around the pulsar PSR J1357-6429 with the Suzaku deep observations. The pulsar, whose characteristic age is 7.3 kyr, is located within the TeV γ-ray source HESS J1356-645. The extended emission is found to have a 1 σ X-ray size of ∼ 4', or ∼ 3 pc at 2.4 kpc, with a small offset from the pulsar. Its …
Physical properties of distant red galaxies in the COSMOS/UltraVISTA field
Fang, Guanwen; Kong, Xu; Fan, Lulu +1 more
We present a study on physical properties for a large distant red galaxy (DRG) sample, using the K-selected multi-band photometry catalog of the COSMOS/UltraVISTA field and the CANDELS near-infrared data. Our sample includes 4485 DRGs with (J - K)AB > 1.16 and KAB < 23.4 mag, and 132 DRGs have HST/WFC3 morphological mea…
A coronal hole jet observed with Hinode and the Solar Dynamics Observatory
Young, Peter R.; Muglach, Karin
A small blowout jet was observed at the boundary of the south polar coronal hole on 2011 February 8 at around 21:00 UT. Images from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) revealed an expanding loop rising from one footpoint of a compact, bipolar bright point. Magnetograms from the Helioseismic Magnetic…
The solar cycle dependence of the weak internetwork flux
McIntosh, Scott W.; Lites, Bruce W.; Centeno, Rebecca
We examine data from the Hinode Observing Program 79 (the "HOP 79" irradiance program) as observed using the Hinode Solar Optical Telescope Spectro-Polarimeter for systematic changes in the weakest observable magnetic flux during the period 2008-2013. At moderate latitudes we find no evidence for systematic changes as a function of time and solar …
(25143) Itokawa: The power of radiometric techniques for the interpretation of remote thermal observations in the light of the Hayabusa rendezvous results*
Hasegawa, Sunao; Usui, Fumihiko; Müller, Thomas G.
The near-Earth asteroid (25143) Itokawa was characterized in great detail by the Japanese Hayabusa mission. We revisited the available thermal observations in the light of the true asteroid properties with the goal of evaluating the possibilities and limitations of thermal model techniques. In total, we used 25 published ground-based mid-infrared …