15 Years Going Steady - Timing the Magnetar 1E 1841-045

Details 15 Years Going Steady - Timing the Magnetar 1E 1841-045 15 Years Going Steady - Timing the Magnetar 1E 1841-045

2001-12-02

arxiv.org/abs/astro-ph/0112019v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, latex, newpasp style file. To appear in "Neutron Stars in Supernova Remnants" (ASP Conference Proceedings)

Scientific paper

We report on a long-term monitoring campaign of 1E 1841-045, the 12-s anomalous X-ray pulsar and magnetar candidate at the center of the supernova remnant Kes 73. We have obtained approximately monthly observations of the pulsar with the Rossi X-ray Timing Explorer spanning over two years, during which time 1E 1841-045 is found to be rotating with sufficient stability to derive a phase-connected timing solution. A linear ephemeris is consistent with observations of the pulse period made over the last 15 yrs with the Ginga, ASCA, XTE, & SAX observatories. Phase residuals suggest the presence of "timing noise", as is typically observed from young radio pulsars. These results confirm a rapid, constant spin-down for the pulsar, which continues to maintain a steady flux; this is inconsistent with most accretion scenarios.

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