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Title: X-ray enhancement and long-term evolution of swift J1822.3–1606

We investigate the X-ray enhancement and the long-term evolution of the recently discovered second 'low-B magnetar' Swift J1822.3-1606 in the frame of the fallback disk model. During a soft gamma burst episode, the inner disk matter is pushed back to larger radii, forming a density gradient at the inner disk. Subsequent relaxation of the inner disk could account for the observed X-ray enhancement light curve of Swift J1822.3-1606. We obtain model fits to the X-ray data with basic disk parameters similar to those employed to explain the X-ray outburst light curves of other anomalous X-ray pulsars and soft gamma repeaters. The long period (8.4 s) of the neutron star can be reached by the effect of the disk torques in the long-term accretion phase ((1-3) × 10{sup 5} yr). The currently ongoing X-ray enhancement could be due to a transient accretion epoch, or the source could still be in the accretion phase in quiescence. Considering these different possibilities, we determine the model curves that could represent the long-term rotational and the X-ray luminosity evolution of Swift J1822.3-1606, which constrain the strength of the magnetic dipole field to the range of (1-2) × 10{sup 12} G on the surface of themore » neutron star.« less
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Sabancı University, Orhanlı-Tuzla, İstanbul 34956 (Turkey)
  2. Max-Planck-Institut für extraterrestrische Physik, Geissenbachstrasse, 85740 Garching bei München (Germany)
  3. Physics Department and Institute of Theoretical and Computational Physics, University of Crete, 71003 Heraklion, Crete (Greece)
Publication Date:
OSTI Identifier:
22341958
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; COSMIC GAMMA BURSTS; DENSITY; EVOLUTION; LUMINOSITY; MAGNETIC DIPOLES; NEUTRON STARS; NEUTRONS; PULSARS; RELAXATION; SURFACES; TORQUE; TRANSIENTS; VISIBLE RADIATION; X RADIATION