Pulse Profile Change Possibly Associated with a Glitch in an Anomalous X-Ray Pulsar 4U 0142+61

Abstract

We report a glitch-like pulse frequency deviation from the simple spin-down law in an anomalous X-ray pulsar (AXP) 4U 0142+61 detected by ASCA observations. We also found a significant pulse profile change after the putative glitch. The glitch parameters resemble those found in another AXP 1RXS J170849.0$-$400910, in the Vela pulsar, and in other radio pulsars. This suggests that the radio pulsars and AXPs have the same internal structure and glitch mechanism. It must be noted, however, that the pulse frequency anomaly can also be explained by a gradual change of the spin-down rate ($\dot{P}$) without invoking a glitch.

arXiv comment14 pages, 4 figures, accepted by ApJ

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Cited by in corpus (19)

• Physics of Neutron Star Crusts
• A study of 315 glitches in the rotation of 102 pulsars
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• Effect of entrainment on stress and pulsar glitches in neutron star crust
• Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
• A Possible Magnetar Nature for IGR J16358-4726
• On the connection between radiative outbursts and timing irregularities in magnetars
• Long-Term Timing and Glitch Characteristics of Anomalous X-ray Pulsar 1RXS J170849.0-400910
• Variation of Spectral and Timing Properties in the Extended Burst Tails from the Magnetar 4U 0142+61
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• The Northern Cross Fast Radio Burst project: V. Search for transient radio emission from Galactic magnetars
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