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Related Experiment Videos

Timing Noise in SGR 1806-20.

Woods, Kouveliotou, Finger

    The Astrophysical Journal
    |June 1, 2000
    PubMed
    Summary
    This summary is machine-generated.

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    We analyzed Rossi X-Ray Timing Explorer data for SGR 1806-20, finding its spin-down rate varies and exhibits significant timing noise, unlike typical radio pulsars. This suggests magnetars may have unique timing properties.

    Area of Science:

    • High-energy astrophysics
    • Compact object physics
    • Pulsar astronomy

    Background:

    • Magnetars, a class of neutron stars, are characterized by extremely strong magnetic fields.
    • Understanding their rotational behavior and emission mechanisms is crucial for stellar evolution models.

    Purpose of the Study:

    • To investigate the rotational dynamics and timing behavior of the Soft Gamma Repeater SGR 1806-20.
    • To compare the timing properties of SGR 1806-20 with those of radio pulsars and other magnetar candidates.

    Main Methods:

    • Phase-connected analysis of Rossi X-Ray Timing Explorer Proportional Counter Array observations spanning 178 days.
    • Modeling of spin-down behavior and analysis of phase residuals for periodicity and timing noise.

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    Main Results:

    • A simple secular spin-down model does not fit the data; the period derivative varies significantly.
    • Phase residuals exhibit timing noise, with magnitudes larger than typically observed in radio pulsars.
    • Magnetar candidates, including SGR 1806-20, show higher timing noise levels than expected from radio pulsar correlations.
    • An orbital model with a 733-day period is statistically acceptable, but companion accretion cannot power the observed emission.

    Conclusions:

    • The rotational behavior of SGR 1806-20 is complex, deviating from simple spin-down models.
    • Magnetars exhibit distinct timing noise characteristics compared to radio pulsars.
    • The observed timing noise in SGR 1806-20 is comparable to some accreting systems, but its spin-down remains coherent over years.