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An anti-glitch in a magnetar

机译：磁星中的小故障

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摘要

Magnetars are neutron stars with X-ray and soft γ-ray outbursts thought to be powered by intense internal magnetic fields. Like conventional neutron stars in the form of radio pulsars, magnetars exhibit 'glitches' during which angular momentum is believed to be transferred between the solid outer crust and the superfluid component of the inner crust. The several hundred observed glitches in radio pulsars and magnetars have involved a sudden spin-up (increase in the angular velocity) of the star, presumably because the interior superfluid was rotating faster than the crust. Here we report X-ray timing observations of the magnetar IE 2259+586 (ref. 8), which exhibited a clear 'anti-glitch'-a sudden spin-down. We show that this event, like some previous magnetar spin-up glitches, was accompanied by multiple X-ray radiative changes and a significant spin-down rate change. Such behaviour is not predicted by models of neutron star spin-down and, if of internal origin, is suggestive of differential rotation in the magnetar, supporting the need for a rethinking of glitch theory for all neutron stars.
机译：磁星是具有X射线和软γ射线爆发的中子星，被认为是由强内部磁场驱动的。像无线电脉冲星形式的传统中子星一样，磁星也表现出“毛刺”，在此期间，角动量被认为在固体外壳和内壳的超流体成分之间传递。在无线电脉冲星和磁星中观察到的数百个毛刺都与恒星的突然旋转（角速度增加）有关，大概是因为内部超流体的旋转速度快于地壳。在这里，我们报告了磁星IE 2259 + 586（参考文献8）的X射线定时观测结果，显示出明显的“抗毛刺”（突然下降）。我们表明，与以前的一些磁极自旋毛刺一样，该事件伴随着多个X射线辐射变化和显着的自旋降速变化。这种行为不是由中子星自旋模型预测的，如果是内部起源的，则暗示着磁星中的旋转差，支持对所有中子星的毛刺理论进行重新思考的需要。

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  • 来源
    《Nature》 |2013年第7451期|591-593|共3页
  • 作者

    R. F. Archibald; V. M. Kaspi; C. -Y. Ng; K. N. Gourgouliatos; D. Tsang; P. Scholz; A. P. Beardmore; N. Gehrels; J. A. Kennea;

  • 作者单位

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada;

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada;

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada,Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong;

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada;

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada;

    Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada;

    Department of Physics and Astronomy,University of Leicester, University Road, Leicester LE17RH, UK;

    Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA;

    Department of Astronomy and Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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