Dual Spin-down States of the Pulsar J1001-5507

Details Dual Spin-down States of the Pulsar J1001-5507 Dual Spin-down States of the Pulsar J1001-5507

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...745...40c&link_type=abstract

The Astrophysical Journal, Volume 745, Issue 1, article id. 40 (2012).

Astronomy and Astrophysics

Astronomy

Pulsars: General, Pulsars: Individual: Psr J1001–5507, Stars: Neutron, Stars: Rotation

Scientific paper

Quasi-regular timing observations obtained, using the 26 m Hartebeesthoek Radio Astronomy Observatory radiotelescope near center frequencies of 1.668 and 2.272 GHz, between 1985 July and 2005 August have given a further insight into the long-term spin-down behavior of the pulsar J1001-5507 (B0959-54). Here, we show that the spin-down of the pulsar during ~20 years is dominated by dual spin-down modes characterized by two discrete and nearly stable spin-down rates (\dot{\nu }_{{low}} = -0.24871 \times 10^{-13} s-2 and \dot{\nu }_{{high}} = -0.25195 \times 10^{-13} s-2). Our analysis demonstrates that the switching of the pulsar's spin-down rate from \dot{\nu }_{{low}} to \dot{\nu }_{{high}} modes occurred over about 800 days (between about MJD 48500 and MJD 49300) at a steady rate of ~-4.6 × 10-24 s-3, after which the pulsar was found to be slowing down 1.3% faster. It is observed that the extreme pulse profile shapes at the two spin-down modes are notably different, while the interval of steady switching between the spin-down modes is coincident with evidence for some correlated pulse shape variations. We discuss these results in light of the current understanding of various mechanisms for radio pulsar spin-down modulation.

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