Glitches from the AXP 1RXS J170849-400910

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Abstract
We carried out a long‐term timing analysis of the Anomalous X‐ray Pulsar 1RXS J170849‐400910 based on archival observations made with the Rossi X‐ray Timing Explorer between January 1998 and May 2002. We detected a new, large glitch from this source which occurred ∼ 1.5 yr after a previous such event, already reported in the literature. The second glitch was much larger than the previous one and comparable to the largest glitches observed in radio pulsars (Δv/v ∼ 4 × 10−6). Its recovery was best‐fit by an exponential with a timescale ∼ 50 d, plus an apparently unrecovered 1% increase in the spin‐down rate of the source. This last result needs confirmation, as a recovery timescale longer than 1 yr cannot be ruled out as yet. Timing residuals after subtraction of the two glitches show a high stability of the spin‐down of 1RXS J170849‐400910 during the ∼ 5 yrs of monitoring, with an r.m.s. ≃ 130 ms ≃ 1.1 % of the rotation period. The glitch properties of this source reveal remarkable peculiarities compared to those of radio pulsars. An analysis of the glitches of 1RXS J170849‐400910 in the light of glitch models seems to hint to the presence of peculiar sources of stress within AXPs, as expected in the magnetar model.

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