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RISS 인기검색어
- 검색키워드
- 저자 : Norita Kawanaka (검색결과 2 건)
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Norita Kawanaka,Rohta Takahashi,Shin Mineshige 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We calculated the iron line proles for Advection-dominated accretion ow (ADAF) using numerical data for the velocity elds and we compared the results with the proles for the case when the inner edge is identical with rms, the radius of the marginally stable orbit. We can conclude that the broadened red wing of the iron line prole can be associated with a non-rotating black hole. The iron K uorescent line emitted from accretion disks provides us with plausible evidence of strong gravitational elds around black holes. When calculating the line prole, many previous studies assumed that there was no material, and no line emission, inside rms. In those studies, the broadened and red-shifted iron lines that had been observed in some Seyfert galaxies could be explained by rapidly rotating black holes because they had values smaller rms than 3rg (rms for non-rotating black holes). Some recent studies show, however, that the inner radius of an accretion disk does not always coinside with rms. We will discuss the possibility that iron line emission from inside the marginally stable orbit of a black hole might signicantly contribute to the line prole.
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A Neutrino-Cooled Accretion Disk as the Central Engine of Gamma-ray Bursts
Norita Kawanaka,Shin Mineshige,Shigehiro Nagataki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
It is often theoretically hypothesized that the enormous power released from gamma-ray bursts is generated by the accretion of a massive torus with approximately a solar mass onto a stellar-mass black hole. Such a torus (or disk) would become so dense and hot that the main cooling process would be neutrino radiation. We study the steady-state structure of this disk and consider the degeneracy of electrons and neutrinos, the opacity of neutrinos, and the equation of state of nuclear matter. The stability of the disk is also discussed.
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