2006 Fiscal Year Final Research Report Summary
Origin of Black Hole Short-Term Variability Investigated by the High-Speed Photometry System
| Project/Area Number |
16340057
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Kyoto University |
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Principal Investigator |
MINESHIGE Shin Kyoto University, Yukawa Inst.for Theoretical Phys., Prof., 基礎物理学研究所, 教授 (70229780)
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| Co-Investigator(Kenkyū-buntansha) |
NOGAMI Daisaku Kyoto University, Graduate School of Science, Assist.Prof., 大学院理学研究科, 助手 (20332728)
OKITA Kiichi Nat.Astron.Obs., Opt.Infra.Obs.Section, Assoc.Prof, 光学赤外線天文学・観測システム系, 助教授 (60204096)
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| Project Period (FY) |
2004 – 2006
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| Keywords | black hole / particle acceleration / non-thermal particles / high-speed photometry / CCD camera / magnetic fields / synchrotron emission / self-organized criticality |
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| Research Abstract |
Black hole objects show violent activities in their radiation. The aim of this project is to observe short-term optical variability with the time resolution of less than 0.1 sec so as to clarify its underlying physical mechanism. Through three-year research, we have obtained the following results :
1)Construction of the high-speed photometry system and observations
By using the CCD camera (CCD87 chip made by e2v co.), which enables us to take 33 pictures/sec, we have constructed a high-speed photometry system. This system was attached to the 1.5m (diameter) "Kanata" telescope at the Higashi-Hiroshima Observatory and was used to observe a prototype black hole, Cygnus X-1. The observations was successful and we found a new type of flares with duration less than a sec.
2)Short-term variations from simulated magnetohydrodynamical (MHD) flow
We have performed global, MHD simulations starting with a torus threaded with poloidal magnetic fields. Then, the toroidal magnetic fields are created and accumulated around the center, producing an inflated magnetic structure (magnetic tower), which drives strong mass and magnetic field outflows (jets). We also calculated radiation spectra based on the simulation data, finding short-term variability in optical lights.
3)A simple model of black hole variability
We proposed a new cellular-automaton model for variability of black-hole objects. The cellular-automaton rule which describes the procedure of model calculations is based on the induction equation and consists with two processes: input of fluctuation in the magnetic field and dissipation of magnetic energy in the form of magnetic reconnection. This model can well reproduce the basic observational features of the black-hole variability, such as aperiodic fluctuation light curves, 1/f-type fluctuation power spectra, and lognormal flux distribution. The success strongly indicates magnetic fields being the origin of producing black-hole variability.
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[Journal Article] The 2005 July Superoutburst of the Dwarf Nova 2QZ J021927.9-304545 : the SU UMa Nature Confirmed2006
Author(s)
Imada, A., Kato, T., Monard, L.A.G., Retter, A., Liu, A., Nogami, D.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] TV Corvi Revisited : Precursor and Superhump Period Derivative Linked to the Disk Instability model2005
Author(s)
Uemura, M., Mennickent, R.E., Ishioka, R., Imada, A., Kato, T., Nogami, D., et al.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] HS 0943+1404, a True Intermediate Polar2005
Author(s)
Rodoriguez-Gil, P., Gaensicke, B.T., Hagen, H, -J., Nogami, D., et al.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Optical Observation of the 2003 Outburst of a Black Hole X-Ray Binary,V4641 Sagittar2004
Author(s)
Uemura, M., Kato, T., Ishioka, R., Imada, A., Nogami, D.他8名
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Journal Title
Pub. Astron. Soc. Japan 56
Pages: 823-829
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Line-Profile Variations during an Eclipse of a Dwarf Nova, IP Pegasi2004
Author(s)
Ishioka, R., Mineshige, S., Kato, T., Nogami, D., Uemura, M.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Optical Observation of the 2003 Outburst of a Black Hole X-Ray Binary, V4641 Sagittarii2004
Author(s)
Uemura, M., Kato, T., Ishioka, R., Imada, A., Nogami, D., et al.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] The Peculiar 2004 Superoutburst in the Helium Dwarf Nova, 2003aw2004
Author(s)
Nogami, D., Monard, B., Retter, A., Liu, A., Uemura, M., Ishioka, R., Imada, A., Kato, T.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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