Abstract:The radio-quiet gamma-ray pulsar PSR J2021+4026 in the Gamma Cygni supernova remnant, is one of the brightest Fermi-LAT pulsars. It first drew attentions in October 2011, when it underwent an abrupt drop in its gamma-ray flux, with a simultaneous increase in its spin-down rate. This mode change was followed by a smooth recovery phase around December 2014, then by a similar mode change in February 2018. Being the only variable isolated gamma-ray pulsar observed so far, PSR J2021+4026 has been studied during the… Show more
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