Spectral Nature of Quiescent X-ray Emission from SGR 0526-66 in the LMC Westerlund 2 and its Halo
Abstract
SGR 0526-66 is the first-identified magnetar, and is projected within the supernova remnant N49 in the Large Magellanic Cloud. Based on our 50 ks NuSTAR observation, we detect ∼200 counts in the 10-30 keV band (L∼ 5.4 x 10 34 erg/s) from the quiescent X-ray counterpart. The detected NuSTAR spectrum is consistent with the spectral extrapolation from the power law model (photon index = 2.5) which previously fitted the hard component Chandra spectrum of 0526-66. Our results could be interpreted as synchrotron radiation from the neutron stars magnetosphere for the origin of the hard component X-ray spectrum of 0526-66 rather than thermal emission from hot spots (a blackbody with kT ∼ 1 keV) which alternatively fitted the hard component Chandra spectrum of 0526-66. We discuss preliminary results from our joint spectral analysis of 0526-66 based on our NuSTAR and the archival Chandra data.
- Publication:
-
Supernova Remnants: An Odyssey in Space after Stellar Death II
- Pub Date:
- June 2019
- Bibcode:
- 2019sros.confE.168P