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We investigate the X-ray enhancement and the long-term evolution of therecently discovered, second "low-B magnetar" Swift J1822.3-1606 in the frame ofthe fallback disk model. During a soft gamma burst episode, the inner diskmatter is pushed back to larger radii forming a density gradient at the innerdisk. Subsequent relaxation of the inner disk could account for the observedX-ray enhancement light curve of Swift J1822.3-1606. We obtain model fits tothe X-ray data with basic disk parameters similar to those employed to explainthe X-ray outburst light curves of other AXPs and SGRs. The long period (8.4 s)of the neutron star can be reached by the effect of the disk torques in thelong-term accretion phase (1-3 x 10^5 yrs). The currently ongoing X-rayenhancement could be due to a transient accretion epoch, or the source couldstill be in the accretion phase in quiescence. Considering these differentpossibilities, we determine the model curves that could represent the long-termrotational and the X-ray luminosity evolution of Swift J1822.3-1606, whichconstrain the strength of the magnetic dipole field to the range of 1-2 x 10^12G on the surface of the neutron star.

X-ray Enhancement And Long-term Evolution Of Swift J1822.3-1606