NDLI: 10 years of RXTE monitoring of anomalous X-ray pulsar 4U 0142+61: long-term variability

Content Provider	Springer Nature Link
Author	Dib, Rim Gavriil, Fotis P. Kaspi, Victoria M.
Copyright Year	2007
Abstract	We report on 10 yr 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 until February 2006: the RMS phase residual for a spin-down model which includes ν, $\dot{\nu}$ , and $\ddot{\nu}$ is 2.3%. We report a possible phase-coherent timing solution valid over a 10-yr span extending back to March 1996. A glitch may have occurred between 1998 and 2000, but it is not required by the existing data. We also report that the source’s pulse profile has been evolving in the past 6 years, such that the dip of emission between its two peaks has been getting shallower since 2000, almost as if the profile is recovering to its pre-2000 morphology, in which there was no clear distinction between the peaks. These profile variations are seen in the 2–4 keV band but not in 6–8 keV. Finally, we present the pulsed flux time series of the source in 2–10 keV. There is evidence of a slow but steady increase in the source’s pulsed flux since 2000. The pulsed flux variability and the narrow-band pulse profile changes present interesting challenges to aspects of the magnetar model.
Ending Page	491
Page Count	5
Starting Page	487
File Format	PDF
ISSN	0004640X
e-ISSN	1572946X
Journal	Astrophysics and Space Science
Issue Number	1-4
Volume Number	308
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-03-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pulsars: individual (4U 0142+61) X-rays: stars Stars: neutron Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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The Anomalous X-ray Pulsar 4U 0142+61: Variability in the infrared and a spectral break in the optical

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

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

Maser mechanism of optical pulsations from anomalous X‐ray pulsar 4U 0142+61

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High-speed, multicolour optical photometry of the anomalous X-ray pulsar 4U 0142+61 with ULTRACAM

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10 years of RXTE monitoring of anomalous X-ray pulsar 4U 0142+61: long-term variability

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