Long-term XMM-Newton view of magnetar CXOU J010043.1$-$721134: Comprehensive spectral and temporal results

Abstract

We present an in-depth analysis and results of eleven XMM-Newton datasets, spanning 2000 to 2016, of the anomalous X-ray Pulsar CXOU J010043.1$-$721134 which has been classified as a magnetar. We find a spin-period of 8.0275(1) s as of December 2016 and calculate the period derivative to be $(1.76\pm 0.02)\times 10^{-11}$ s s${}^{-1}$, which translate to a dipolar magnetic field strength of $3.8\times 10^{14}$ G and characteristic age of $\sim 7200$ yr for the magnetar. It has a double-peaked pulse profile, with one broad and one narrow peak, in both soft ($0.3-1.3$ keV) and hard ($1.3-8$ keV) energy bands. The pulse fractions in the two energy bands are found to be consistent with constant values. These results are in agreement with previously published results for this source. Although two-component models produce acceptable fits to its energy spectra, single component models are much simpler and are able to explain the similarity of the pulse profiles in the low and high energy bands. We attempt fitting with four different single-component models and find that the best fit to the spectra is obtained by fitting a thermal Comptonization model with the photon index $(\Gamma )$ between $2.0-2.7$ and the electron temperature $(k{T}_e)$ between $0.5-0.9$ keV, for a seed blackbody photon distribution of 0.2 keV. Finally, we conclude by discussing our results briefly.

10 pages, 6 figures, Accepted for publication in MNRAS

References in corpus (15)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
• Resonant cyclotron scattering in magnetars' emission
• Detailed high-energy characteristics of AXP 1RXS J170849-400910 - Probing the magnetosphere using INTEGRAL, RXTE and XMM-Newton
• From outburst to quiescence: the decay of the transient Anomalous X-ray Pulsar XTE J1810-197
• X-ray and Near-IR Variability of the Anomalous X-ray Pulsar 1E 1048.1-5937: From Quiescence Back to Activity
• Constraining the Geometry of the Neutron Star RX J1856.5-3754
• Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
• XMM-Newton observations of CXOU J010043.1-721134: the first deep look at the soft X-ray emission of a magnetar
• NuSTAR Observations of the Magnetar 1E 2259+586
• Two new outbursts and transient hard X-rays from 1E 1048.1$-$5937
• AstroSat view of LMC X-2: Evolution of broadband X-ray spectral properties along a complete Z-track
• A search for the optical counterpart to the magnetar CXOU J010043.1-721134
• Spectral analysis of LMC X-2 with XMM/Newton: unveiling the emission process in the extragalactic Z-source
• X-ray timing studies of the low-field magnetar CXOU J164710.2-455216

Cited by in corpus (2)

• Wide-band view of High Frequency QPOs of GRS 1915+105 in 'softer' variability classes observed with AstroSat
• Discovery of a magnetar candidate X-ray pulsar in the Large Magellanic Cloud