Unusual glitch behaviours of two young pulsars

Abstract

In this paper we report unusual glitches in two young pulsars, PSR J1825-0935 (B1822-09) and PSR J1835-1106. For PSR J1825-0935, a slow glitch characterised by a temporary decrease in the slowdown rate occurred between 2000 December 31 to 2001 December 6. This event resulted in a permanent increase in frequency with fractional size $\Delta \nu /\nu \sim 31.2(2)\times 10^{-9}$, however little effect remained in slowdown rate. The glitch in PSR J1835-1106 occurred abruptly in November 2001 (MJD 52220\pm3) with $\Delta \nu /\nu \sim 14.6(4)\times 10^{-9}$ and little or no change in the slow-down rate. A significant change in $\ddot{\nu }$ apparently occurred at the glitch with $\ddot{\nu }$ having opposite sign for the pre- and post-glitch data.

Latex format, six files, 5 pages with 4 figues. accepted for MNRAS

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