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 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, 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.
Alteration of the Magnetosphere of the Vela Pulsar During a GlitchJ Palfreyman et al. Nature 556 (7700), 219-222. PMID 29643483.As pulsars lose energy, primarily in the form of magnetic dipole radiation, their rotation slows down accordingly. For some pulsars, this spin-down is interrupted by occa …
Transient Pulsed Radio Emission From a MagnetarF Camilo et al. Nature 442 (7105), 892-5. PMID 16929292.Anomalous X-ray pulsars (AXPs) are slowly rotating neutron stars with very bright and highly variable X-ray emission that are believed to be powered by ultra-strong magne …
Pinning Down the Superfluid and Measuring Masses Using Pulsar GlitchesWC Ho et al. Sci Adv 1 (9), e1500578. PMID 26601293.Pulsars are known for their superb timing precision, although glitches can interrupt the regular timing behavior when the stars are young. These glitches are thought to b …
X-ray Studies of Neutron Stars and Their Magnetic FieldsK Makishima. Proc Jpn Acad Ser B Phys Biol Sci 92 (5), 135-55. PMID 27169348. - ReviewUtilizing results obtained over the past quarter century mainly with Japanese X-ray astronomy satellites, a review is given to some aspects of neutron stars (NSs), with a …
Surface Emission From Neutron Stars and Implications for the Physics of Their InteriorsF Ozel. Rep Prog Phys 76 (1), 016901. PMID 23234858. - ReviewNeutron stars are associated with diverse physical phenomena that take place in conditions characterized by ultrahigh densities as well as intense gravitational, magnetic …
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Astrophysics: A Glimpse Inside a MagnetarRC Duncan. Nature 497 (7451), 574-6. PMID 23719459.