Observations of free precession of magnetars and estimation of their internal magnetic fields
| Project/Area Number |
15H03653
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Makishima Kazuo 東京大学, 大学院理学系研究科(理学部), 名誉教授 (20126163)
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| Co-Investigator(Kenkyū-buntansha) |
中澤 知洋 名古屋大学, 大学院理学系研究科(理学部), 准教授 (50342621)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2015: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Keywords | 中性子星 / マグネター / 自由歳差運動 / 内部磁場 / 宇宙Ｘ線衛星 |
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| Outline of Final Research Achievements |
Using the Suzaku observatory, we had discovered long-period phase-modulation effects in the hard X-ray pulses from two mangetars. This was interpreted as a result of free precession in neutron stars that are axially deformed by ultra-strong toroidal fields hidden in them. In the present study, we analyzed X-ray data of these two magnetars obtained with the US NuSTAR satellite, and successfully reconfirmed the pulse-phase modulation effects in both objects. However, the modulation amplitudes in these objects were considerably different from those measured with Suzaku. In another magnetar observed with Suzaku in 2010, a similar phase modulation phenomenon in the hard X-ray pulses was discovered at a period of 48 ksec. Using the X-ray data from the MAXI observatory, we studied relations between the X-ray intensities and pulse-peiriod derivatives of various binary X-ray pulsars. Then, the object named X Perses was found to have magnetic fields which are comparable to those of magnetars.
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Report
(4 results)
Research Products
(29 results)
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[Journal Article] Possible regular phenomena in EXO 2030+3752017
Author(s)
Laplace, Eva; Mihara, Tatehiro; Moritani, Yuki; Nakajima, Motoki; Takagi, Toshihiro; Makishima, Kazuo; Santangelo, Andrea
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Journal Title
Astronomy and Astrophysics
Volume: 597
Pages: A124-A124
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Do Long-Period Binary Pulsars Have Stronger Magnetic Fields than Ordinary Accretion- Powered Pulsars?2017
Author(s)
Makishima, K , Takagi, T , Mihara, T , Sugizaki, M , Yatabe, F , Sasano, M , Nakazawa, K , Nakajima, M.
Organizer
European Week of Astronomy and Space Science (2017/6/30, Prague)
Related Report
Int'l Joint Research
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[Presentation] RECENT X-RAY RESULTS ON MAGNETARS (Poster)2016
Author(s)
Makishima,K., Enoto, T., Nakano. T., Murakami, H., Furuta, Y., Nakazawa, K. & Nakagawam Y.E.
Organizer
14th International Symposium on Nuclei in the Cosmos
Place of Presentation
朱鷺メッセ(新潟県新潟市)
Year and Date
2016-06-20
Related Report
Int'l Joint Research
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[Presentation] A new approach to observe toroidal magnetic fields of magnetars2016
Author(s)
Murakami, H., Makishima, K., Enoto , T., Nakano, T., & Nakazawa, K.
Organizer
XMM-Newton: The Next Decade
Place of Presentation
European Space Astronomy Center (Madrid, Spain)
Year and Date
2016-05-09
Related Report
Int'l Joint Research
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