4U 0142+61 is a 8.7-s anomalous X-ray pulsar which, in data from our RXTEmonitoring program, shows pulsations that are slowly but steadily gettingbrighter. Since 2000, the pulses have brightened by approximately 50%. Inconcert with the brightening, the pulse profile is clearly evolving on acomparable time scale. This behavior is unprecedented for an AXP and challengesthe current magnetar model. We request two XMM observations of the source inCycle 5 in order to monitor its phase-averaged flux and its spectrum, to try toshed light on the physical origin of this behavior.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2006-07-28T17:45:03Z/2007-01-13T21:46:00Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Prof Victoria Kaspi, 2008, 'XMM Monitoring of the Evolving AXP 4U 0142+61', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-q30d7hi
