Zobrazeno 1 - 10
of 520
pro vyhledávání: '"Ebisawa, Ken"'
Autor:
Kurihara, Miki, Iwakiri, Wataru Buz, Tsujimoto, Masahiro, Ebisawa, Ken, Toriumi, Shin, Imada, Shinsuke, Tsuboi, Yohko, Usui, Kazuki, Gendreau, Keith C., Arzoumanian, Zaven
We detected a giant X-ray flare from the RS-CVn type binary star UX Ari using MAXI on 2020 August 17 and started a series of NICER observations 89 minutes later. For a week, the entire duration of the flare was covered with 32 snapshot observations i
Externí odkaz:
http://arxiv.org/abs/2403.12351
Super Soft X-ray Sources (SSS) are white dwarf (WD) binaries that radiate almost entirely below $\sim$1~keV. Their X-ray spectra are often complex when viewed with the X-ray grating spectrometers, where numerous emission and absorption features are i
Externí odkaz:
http://arxiv.org/abs/2311.06492
Circinus X-1 (Cir X-1) is a neutron star binary with an elliptical orbit of 16.6~days. The source is unique for its extreme youth, providing a key to understanding early binary evolution. However, its X-ray variability is too complex to reach a clear
Externí odkaz:
http://arxiv.org/abs/2310.07158
Complex Fe-K emission/absorption line features are commonly observed in the 6--11 keV band from Active Galactic Nuclei (AGN). These features are formed in various physical components surrounding the black holes. The Narrow-Line Seyfert 1 (NLS1) galax
Externí odkaz:
http://arxiv.org/abs/2308.05924
Recent radiation-magnetohydrodynamic simulations of active galactic nuclei predict the presence of the disk winds, which may get unstable and turn into fragmented clumps far from the central black hole. These inner winds and the outer clumps may be o
Externí odkaz:
http://arxiv.org/abs/2307.12023
MAXI J1820$+$070 is a transient black hole binary (BHB) discovered on 2018 March 11. The unprecedented rich statistics brought by the NICER X-ray telescope allows detailed timing analysis up to $\sim$1~kHz uncompromised by the photon shot noise. To e
Externí odkaz:
http://arxiv.org/abs/2302.11263
Contemporary radiation-magnetohydrodynamic simulation of the AGNs predicts presence of the hot and strong accretion disk wind, which gets unstable far from the central region and turns into gas clumps. These inner-wind and outer clumps may be actuall
Externí odkaz:
http://arxiv.org/abs/2210.11746
NGC 5548 is a very well-studied Seyfert 1 galaxy in broad wavelengths. Previous multiwavelength observation campaigns have indicated that its multiple absorbers are highly variable and complex. A previous study applied a two-zone partial covering mod
Externí odkaz:
http://arxiv.org/abs/2205.03021
WR~102-1 was detected by Suzaku as a conspicuous point source in the 6.7 keV intensity map of the central region of the Milky Way. The source was suggested as a possible Wolf-Rayet binary based on its X-ray and infrared spectral characteristics. The
Externí odkaz:
http://arxiv.org/abs/2204.09349
Presence of the apparently extended hard (2-10 keV) X-ray emission along the Galactic plane has been known since the early 1980s. With a deep X-ray exposure using the Chandra X-ray Observatory of a slightly off-plane region in the Galactic bulge, mos
Externí odkaz:
http://arxiv.org/abs/2112.10355