# SGR 0418*5729 - How does a young neutron star spin down to a 9 s period with a dipole field less than 10^{13} G.

Alpar, M. Ali and Ertan, Ünal and Çalışkan, Şirin (2010) SGR 0418*5729 - How does a young neutron star spin down to a 9 s period with a dipole field less than 10^{13} G. (Submitted)

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## Abstract

The period derivative bound for SGR 0418+5759 (Rea at al. 2010) establishes the magnetic dipole moment to be distinctly lower than the magnetar range, placing the source beyond the regime of isolated pulsar activity in the P - dP/dt diagram. A fallback disk will spin down a neutron star with surface dipole magnetic field in the 10$^{12}$ G range and initial rotation period ~100 ms to the 9.1 s period of SGR 0418+5759 in a few 10^4 years. The current upper limit to the period derivative gives a lower limit of ~2 \times 10^5 years to the age that is not sensitive to the neutron star's initial conditions.

Item Type: Article Q Science > QB AstronomyQ Science > QC Physics 15707 Ünal Ertan 06 Dec 2010 22:34 06 Dec 2010 22:34

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