| 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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| 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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