Unusual glitch behaviours of two young pulsars

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 ∆ν/ν ∼ 31.2(2)×10, however little effect remained in slowdown rate. The glitch in PSR J1835−1106 occurred abruptly in November 2001 (MJD 52220±3) with ∆ν/ν ∼ 14.6(4)× 10 and little or no change in the slow-down rate. A significant change in ν̈ apparently occurred at the glitch with ν̈ having opposite sign for the preand post-glitch data.