Evidence for a 36 ks phase modulation in the hard X-ray pulses from the magnetar 1E 1547.0－5408
Evidence for a 36 ks phase modulation in the hard X-ray pulses from the magnetar 1E 1547.0－5408
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磁星1E 1547.0－5408的硬X射线脉冲中36 ks相位调制的证据
DOI：
10.1093/pasj/psv097
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发表时间：
2015
影响因子：
2.3
通讯作者：
K. Nakazawa
中科院分区：
文献类型：
--
作者：
K. Makishima;T. Enoto;H. Murakami;Y. Furuta;T. Nakano;M. Sasano;K. Nakazawa
对2009年1月活动期间获得的高可变磁星1E 1547.0−5408Suzaku数据进行了重新分析。在15-40 keV HXD资料中观测到的2.0 7 S脉动具有位相调制现象，这种调制可以用周期为ofk、振幅为0.5 2±0.14 S的正弦波来模拟，而在10-14 keV Xis资料中也可以看到这种影响，调制幅度向低能量方向减小，在4 keV以下与0一致。在4U 0142+61的案例之后，这就是从磁星探测到的这种行为的第二个例子。这种效应可以解释为磁星无扭矩进动的一种表现，建议在∼1016G的强环向场存在下发生新的形变。
The Suzaku data for the highly variable magnetar 1E 1547.0−5408, obtained during the 2009 January activity, were reanalyzed. The 2.07 s pulsation, detected in the 15–40 keV HXD data, was found to exhibit phase modulation, which can be modeled by a sinusoid with a period ofks and an amplitude of 0.52 ± 0.14 s. While the effect is also seen in the 10–14 keV XIS data, the modulation amplitude decreased towards lower energies, becoming consistent with 0 below 4 keV. After the case of 4U 0142+61, this makes the second example of this kind of behavior detected from magnetars. The effect can be interpreted as a manifestation of torque-free precession of this magnetar, which is suggested to be prolately deformed under the presence of a strong toroidal field of ∼1016G.