Observation of the Anomalous X-Ray Pulsar 4U 0142+61

Abstract

We present results of an observation of the anomalous X-ray pulsar 4U 0142+61 with the EPIC cameras on XMM-Newton performed on 2003 January 24. The pulse phase averaged spectrum can be best described by the sum of a black body with a temperature of kT_BB = 0.395(5) keV and a power law with photon index Gamma = 3.62(5). The unabsorbed 2-10 keV flux is ~7.2x10^-11 erg s^-1 cm^-2. No evidence for additional spectral features such as cyclotron lines is present. These results are consistent with those from an earlier Chandra observation in 2001 May. Phase resolved spectroscopy over the 8.6882(2) s period (MJD 52663.93) shows clear variations with pulse phase of Gamma, while kT_BB shows a small variation of ~12%. We confirm earlier conclusions by Oezel (2001) that the emission from AXPs is more likely to originate from neutron stars with one single and magnetically active region on the neutron star. The significantly different behavior of the soft and hard spectral components with pulse phase, however, cannot be fully reconciled with the present magnetar emission models.

5 pages, 4 figures

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• The Correlation between Dispersion Measure and X-ray Column Density from Radio Pulsars
• Magnetars as persistent hard X-ray sources: INTEGRAL discovery of a hard tail in SGR 1900+14
• Resonant Cyclotron Scattering in Three Dimensions and the Quiescent Non-thermal X-ray Emission of Magnetars
• The Compact X-ray Source 1E 1547.0-5408 and the Radio Shell G327.24-0.13: A New Proposed Association between a Candidate Magnetar and a Candidate Supernova Remnant
• Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
• A white dwarf merger as progenitor of the anomalous X-ray pulsar 4U 0142+61?
• Physical Properties of the AXP 4U 0142+61 from X-ray Spectral Analysis
• Phase-resolved NuSTAR and Swift-XRT Observations of Magnetar 4U 0142+61
• Chandra observations of SGR 1627-41 near quiescence
• SGR 0418+5729, Swift J1822.3-1606, and 1E 2259+586 as massive fast rotating highly magnetized white dwarfs
• Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates
• Thermal X-ray emission from massive, fast rotating, highly magnetized white dwarfs
• Unveiling Soft Gamma-Ray Repeaters with INTEGRAL
• The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays
• Studies of Cepheus X-4 during 2018 outburst observed with AstroSat