Journal
ASTROPHYSICAL JOURNAL
Volume 702, Issue 1, Pages 614-630Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/702/1/614
Keywords
pulsars: individual (1E 1048.1-5937); stars: neutron; X-rays: stars
Categories
Funding
- NSERC Discovery Grant [Rgpin 228738-08]
- FQRNT Centre
- CIFAR
- Canada Research Chairs Program
- Lorne Trottier Chair in Astrophysics and Cosmology
Ask authors/readers for more resources
After three years of no unusual activity, Anomalous X-ray Pulsar 1E 1048.1-5937 reactivated in 2007 March. We report on the detection of a large glitch (Delta nu/nu = 1.63(2) x 10(-5)) on 2007 March 26 (MJD 54185.9), contemporaneous with the onset of a pulsed-flux flare, the third flare observed from this source in 10 years of monitoring with the Rossi X-ray Timing Explorer (RXTE). Additionally, we report on a detailed study of the evolution of the timing properties, the pulsed flux, and the pulse profile of this source as measured by RXTE from 1996 July to 2008 January. In our timing study, we attempted phase-coherent timing of all available observations. We show that in 2001 a timing anomaly of uncertain nature occurred near the rise of the first pulsed flux flare; we show that a likely glitch (Delta nu/nu = 2.91(9) x 10(-6)) occurred in 2002, near the rise of the second flare, and we present a detailed description of the variations in the spin down. In our pulsed flux study, we compare the decays of the three flares and discuss changes in the hardness ratio. In our pulse profile study, we show that the profile exhibited large variations near the peak of the first two flares, and several small short-term profile variations during the most recent flare. Finally, we report on the discovery of a small burst 27 days after the peak of the last flare, the fourth burst discovered from this source. We discuss the relationships between the observed properties in the framework of the magnetar model.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available