NuSTAR Observations of the Magnetar 1E 2259+586

Abstract

We report on new broad band spectral and temporal observations of the magnetar 1E 2259+586, which is located in the supernova remnant CTB 109. Our data were obtained simultaneously with the Nuclear Spectroscopic Telescope Array (NuSTAR) and Swift, and cover the energy range from 0.5-79 keV. We present pulse profiles in various energy bands and compare them to previous RXTE results. The NuSTAR data show pulsations above 20 keV for the first time and we report evidence that one of the pulses in the double-peaked pulse profile shifts position with energy. The pulsed fraction of the magnetar is shown to increase strongly with energy. Our spectral analysis reveals that the soft X-ray spectrum is well characterized by an absorbed double-blackbody or blackbody plus power-law model in agreement with previous reports. Our new hard X-ray data, however, suggests that an additional component, such as a power-law, is needed to describe the NuSTAR and Swift spectrum. We also fit the data with the recently developed coronal outflow model by Beloborodov for hard X-ray emission from magnetars. The outflow from a ring on the magnetar surface is statistically preferred over outflow from a polar cap.

arXiv comment37 pages, 9 figures, corresponding author, [email protected]

References in corpus (23)

• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• The McGill Magnetar Catalog
• Untwisting magnetospheres of neutron stars
• A Major SGR-like Outburst and Rotation Glitch in the No-Longer-So-Anomalous X-ray Pulsar 1E 2259+586
• Magnetar-like X-ray Bursts from an Anomalous X-ray Pulsar
• 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
• A variable absorption feature in the X-ray spectrum of a magnetar
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• On the X-ray Spectra of Anomalous X-ray Pulsars and Soft Gamma Repeaters
• Phase-resolved X-ray spectra of magnetars and the coronal outflow model
• NuSTAR observations of magnetar 1E 1841-045
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• Magnetars
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• Magnetars: Properties, Origin and Evolution
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• X-ray and radio observations of the magnetar SGR J1935+2154 during its 2014, 2015, and 2016 outbursts
• Magnetar Broadband X-ray Spectra Correlated with Magnetic Fields: Suzaku Archive of SGRs and AXPs Combined with NuSTAR, Swift, and RXTE
• Magnetars: a short review and some sparse considerations
• Resonant Inverse Compton Scattering Spectra from Highly-magnetized Neutron Stars
• Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045
• The Sleeping Monster: NuSTAR observations of SGR 1806-20, 11 years after the Giant Flare
• Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum
• Phase-resolved NuSTAR and Swift-XRT Observations of Magnetar 4U 0142+61
• Axions: From Magnetars and Neutron Star Mergers to Beam Dumps and BECs
• Two new outbursts and transient hard X-rays from 1E 1048.1$-$5937
• Ohmic heating of asteroids around magnetic stars
• Pair Plasma in Super-QED Magnetic Fields and the Hard X-ray/Optical Emission of Magnetars
• The long-term enhanced brightness of the magnetar 1E 1547.0-5408
• A deceleration search for magnetar pulsations in the X-ray plateaus of Short GRBs
• Thermal luminosity degeneracy of magnetized neutron stars with and without hyperon cores
• NuSTAR Observations of Magnetar 1E 1048.1-5937
• Broadband X-ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937
• X-ray Perspective of the Twisted Magnetospheres of Magnetars
• Systematic Analysis of the Effects of Mode Conversion on Thermal Radiation from Neutron Stars
• X-ray Monitoring of the Magnetar CXOU J171405.7-381031 in SNR CTB 37B
• Flux Relaxation after two outbursts of the magnetar SGR 1627$-$41 and possible hard X-ray emission
• Long-term XMM-Newton view of magnetar CXOU J010043.1$-$721134: Comprehensive spectral and temporal results
• Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14
• AstroSat observation of the magnetar SGR J1830$-$0645 during its first detected X-ray outburst