10 Years of RXTE Monitoring of the Anomalous X-Ray Pulsar 4U 0142+61: Long-Term Variability

Details 10 Years of RXTE Monitoring of the Anomalous X-Ray Pulsar 4U 0142+61: Long-Term Variability 10 Years of RXTE Monitoring of the Anomalous X-Ray Pulsar 4U 0142+61: Long-Term Variability

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...666.1152d&link_type=abstract

The Astrophysical Journal, Volume 666, Issue 2, pp. 1152-1164.

Astronomy and Astrophysics

Astronomy

31

Stars: Pulsars: Individual: Alphanumeric: 4U 0142+61, Stars: Neutron, X-Rays: Stars

Scientific paper

We report on 10 years of monitoring of the 8.7 s anomalous X-ray pulsar 4U 0142+61 using the Rossi X-Ray Timing Explorer (RXTE). This pulsar exhibited stable rotation from 2000 March until 2006 February; the rms phase residual for a spin-down model, which includes ν, ν˙, and ν̈, is 2.3%. We report a possible phase-coherent timing solution valid over a 10 yr span extending back to 1996 March. A glitch may have occurred between 1998 and 2000, but is not required by the existing timing data. The pulse profile has been evolving since 2000. In particular, the dip of emission between its two peaks got shallower between 2002 and 2006, as if the profile were evolving back to its pre-2000 morphology, following an earlier event, which possibly also included the glitch suggested by the timing data. These profile variations are seen in the 2-4 keV band, but not in 6-8 keV. We also detect a slow increase in the pulsed flux between 2002 May and 2004 December, such that it has risen by 36%+/-3% over 2.6 yr in the 2-10 keV band. The pulsed flux variability and the narrowband pulse profile changes present interesting challenges to aspects of the magnetar model.

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