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Article overview
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Magnetars vs. high magnetic field pulsars: a theoretical interpretation of the apparent dichotomy | | Jose A. Pons
; Rosalba Perna
; | | Date: |
23 Sep 2011 | | Abstract: | Highly magnetized neutron stars (NSs) are characterized by a bewildering
range of astrophysical manifestations. Here, building on our simulations of the
evolution of magnetic stresses in the NS crust and its ensuing fractures (Perna
& Pons 2011), we explore in detail, for the middle-age and old NSs, the
dependence of starquake frequency and energetics on the relative strength of
the poloidal (B_p) and toroidal (B_tor) components. We find that, for B_p
>~10^{14}G, since a strong crustal toroidal field B_tor B_p is quickly formed
on a Hall timescale, the initial toroidal field needs to be B_tor >> B_p to
have a clear influence on the outbursting behaviour. For initial fields B_p <~
10^{14}G, it is very unlikely that a middle-age (t~10^5 years) NS shows any
bursting activity. This study allows us to solve the apparent puzzle of how NSs
with similar dipolar magnetic fields can behave in a remarkably different way:
an outbursting ’magnetar’ with a high X-ray luminosity, or a quiet,
low-luminosity, "high-$B$" radio pulsar. As an example, we consider the
specific cases of the magnetar 1E2259+586 and the radio pulsar PSRJ1814-1744,
which at present have a similar dipolar field ~6x10^{13}G. We determine for
each object an initial magnetic field configuration that reproduces the
observed timing parameters at their current age. The same two configurations
also account for the differences in quiescent X-ray luminosity and for the
’magnetar/outbursting’ behaviour of 1E2259+586 but not of PSRJ1814-1744. We
further use the theoretically predicted surface temperature distribution to
compute the light-curve for these objects. In the case of 1E2259+586, for which
data are available, our predicted temperature distribution gives rise to a
pulse profile whose double-peaked nature and modulation level is consistent
with the observations. | | Source: | arXiv, 1109.5184 | | Services: | Forum | Review | PDF | Favorites | |
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