期刊
NATURE
卷 497, 期 7451, 页码 591-593出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature12159
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada
- Canadian Institute for Advanced Research
- Fonds de Recherche Nature et Technologies Quebec
- Canada Research Chairs Program
- Lorne Trottier Chair in Astrophysics and Cosmology
- Centre de Recherche en Astrophysique du Quebec
- UK Space Agency [ST/J000841/1] Funding Source: researchfish
Magnetars are neutron stars with X-ray and soft gamma-ray outbursts thought to be powered by intense internal magnetic fields(1). 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(2-4). The several hundred observed glitches in radio pulsars(5,6) and magnetars(7) 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 1E 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(9), 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(10,11).
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