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Related Experiment Videos

Magnetar Spin-Down.

Harding, Contopoulos, Kazanas

    The Astrophysical Journal
    |October 20, 1999
    PubMed
    Summary

    Relativistic winds impact neutron star spin-down. Soft gamma repeaters (SGRs) with episodic winds suggest magnetar fields, while continuous winds indicate lower fields, aiding age and magnetic field determination.

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    Area of Science:

    • Astrophysics
    • High-energy astrophysics

    Background:

    • Soft gamma repeaters (SGRs) are believed to be neutron stars with exceptionally strong magnetic fields (>10^14 G).
    • Neutron star spin-down is influenced by dipole radiation and particle winds.

    Purpose of the Study:

    • To investigate the influence of relativistic winds on neutron star spin-down.
    • To apply these findings to understand the properties of soft gamma repeaters (SGRs).

    Main Methods:

    • Derivation of a spin-down formula incorporating torques from dipole radiation and particle winds.
    • Analysis of SGR 1806-20 as a case study, considering both continuous and episodic wind scenarios.

    Main Results:

    • A continuous particle wind (10^37 ergs s^-1) for SGR 1806-20 yields consistent pulsar age but a lower magnetic field (3x10^13 G).
    • Episodic particle winds with a small duty cycle reconcile observed period derivatives with magnetar-strength fields and plausible ages.

    Conclusions:

    • The duty cycle of particle winds is crucial for determining the magnetic field strength and age of SGRs.
    • Continuous monitoring of SGR periods can constrain wind properties, magnetic fields, and neutron star ages.

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