The micro-glitch in PSR B1821−24: a case for a strange pulsar? |
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| Authors: | Raka Dona Ray Mandal Sushan Konar Mira Dey Jishnu Dey |
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| Institution: | Department of Physics, Rajghat Besant School, Varanasi, India;Ramanna Project, Department of Physics, Presidency College, Kolkata, India;Physics, Harish-Chandra Research Institute, Allahabad, India |
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| Abstract: | The single glitch observed in PSR B1821?24, a millisecond pulsar in M28, is unusual on two counts. First, the magnitude of this glitch is at least an order of magnitude smaller (Δν/ν～ 10?11) than the smallest glitch observed to date. Secondly, all other glitching pulsars have strong magnetic fields with B ? 1011 G and are young, whereas PSR B1821?24 is an old recycled pulsar with a field strength of 2.25 × 109 G . We have earlier suggested that some of the recycled pulsars could actually be strange quark stars. In this work, we argue that the crustal properties of such a strange pulsar are just right to give rise to a glitch of this magnitude, explaining the scarcity of larger glitches in millisecond pulsars. |
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| Keywords: | stars: neutron pulsar: individual: B1821?24 |
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