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.

37 pages, 9 figures, corresponding author, [email protected]

References in corpus (4)

• Untwisting magnetospheres of neutron stars
• 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
• INTEGRAL survey of the Cassiopeia region in hard X rays
• Extinction Columns and Intrinsic X-ray Spectra of the Anomalous X-ray Pulsars

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• Ohmic heating of asteroids around magnetic stars
• 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
• X-ray Perspective of the Twisted Magnetospheres of Magnetars
• Systematic Analysis of the Effects of Mode Conversion on Thermal Radiation from Neutron Stars
• Long-term XMM-Newton view of magnetar CXOU J010043.1$-$721134: Comprehensive spectral and temporal results
• AstroSat observation of the magnetar SGR J1830$-$0645 during its first detected X-ray outburst