SIMBAD references

2015ApJ...815...15W - Astrophys. J., 815, 15 (2015/December-2)

Broadband X-ray spectral investigations of magnetars, 4U 0142+61, 1E 1841-045,1E 2259+586, AND 1E 1048.1-5937.


Abstract (from CDS):

We have generated an extended version of a rather simplified but physically oriented three-dimensional magnetar emission model, STEMS3D, to allow spectral investigations up to 100 keV. We then applied our model to the broadband 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 the 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 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.

Abstract Copyright:

Journal keyword(s): magnetic fields - pulsars: individual: (4U 0142+61, 1E 1841-045) - radiation mechanisms: non-thermal - stars: neutron - X-rays: stars

Simbad objects: 12

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