Broadband X-ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937

Abstract

We have generated an extended version of rather simplified but physically oriented three-dimensional magnetar emission model, STEMS3D, to allow spectral investigations up to 100 keV. We have then applied it to the broadband spectral spectra of four magnetars: 4U 0142+61, 1E 1841-045, 1E 2259+586 and 1E 1048.1-5937, using data collected with Swift/XRT or XMM-Newton in soft X-rays, and Nuclear Spectroscopic Telescope Array in the hard X-ray band. We found that the hard X-ray emission of 4U 0142+61 was spectrally hard compared to the earlier detections, indicating that the source was likely in a transition to or from a harder state. We find that the surface properties of the four magnetars are consistent with what we have obtained using only the soft X-ray data with STEMS3D, implying that our physically motivated magnetar emission model is a robust tool. Based on our broadband spectral investigations, we conclude that resonant scattering of the surface photons in the magnetosphere alone cannot account for the hard X-ray emission in magnetars; therefore, an additional non-thermal process, or a population of relativistic electrons is required. We also discuss the implication of the non-detection of persistent hard X-ray emission in 1E 1048.1-5937.

8 pages, 3 figures, 2 Tables, ApJ in press

References in corpus (23)

• Corona of Magnetars
• Magnetars: Properties, Origin and Evolution
• Magnetar-like Emission from the Young Pulsar in Kes 75
• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
• Discovery of luminous pulsed hard X-ray emission from anomalous X-ray pulsars 1RXS J1708-4009, 4U 0142+61 and 1E 2259+586 by INTEGRAL and RXTE
• 16 Years of RXTE Monitoring of Five Anomalous X-ray Pulsars
• X-ray spectra from magnetar candidates. I. Monte Carlo simulations in the non-relativistic regime
• Resonant cyclotron scattering in magnetars' emission
• Resonant Compton Upscattering in Anomalous X-ray Pulsars
• Detailed high-energy characteristics of AXP 4U 0142+61 - Multi-year observations with INTEGRAL, RXTE, XMM-Newton and ASCA
• Timing and Flux Evolution of the Galactic Center Magnetar SGR J1745-2900
• Detailed high-energy characteristics of AXP 1RXS J170849-400910 - Probing the magnetosphere using INTEGRAL, RXTE and XMM-Newton
• X-ray spectra from magnetar candidates. II Resonant cross sections for electron-photon scattering in the relativistic regime
• The long-term post-outburst spin down and flux relaxation of magnetar Swift J1822.3$-$1606
• The Magnetar Nature and the Outburst Mechanism of a Transient Anomalous X-ray Pulsar
• Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045
• Phase-resolved X-ray spectra of magnetars and the coronal outflow model
• NuSTAR Observations of the Magnetar 1E 2259+586
• NuSTAR observations of magnetar 1E 1841-045
• NuSTAR observations of X-ray bursts from the magnetar 1E 1048.1-5937
• 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
• X-ray Perspective of the Twisted Magnetospheres of Magnetars

Cited by in corpus (7)

• Magnetar Broadband X-ray Spectra Correlated with Magnetic Fields: Suzaku Archive of SGRs and AXPs Combined with NuSTAR, Swift, and RXTE
• Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum
• Two new outbursts and transient hard X-rays from 1E 1048.1$-$5937
• An observational argument against accretion in magnetars
• Persistent Emission Properties of SGR J1935+2154 During Its 2020 Active Episode
• NuSTAR Observations of Magnetar 1E 1048.1-5937
• X-Ray Observations of Magnetar SGR 0501+4516 from Outburst to Quiescence