Vogel, Julia K.10; Hascoet, Romain11; Kaspi, Victoria M.12; An, Hongjun12; Archibald, Robert12; Beloborodov, Andrei M.11; Boggs, Steven E.6; Christensen, Finn Erland1; Craig, William W.6; Gotthelf, Eric V.11; Grefenstette, Brian W.13; Hailey, Charles J.11; Harrison, Fiona A.13; Kennea, Jamie A.14; Madsen, Kristin K.13; Pivovaroff, Michael J.10; Stern, Daniel13; Zhang, William W.15
1 National Space Institute, Technical University of Denmark2 Astrophysics, National Space Institute, Technical University of Denmark3 Lawrence Livermore National Laboratory4 Columbia University5 McGill University6 University of California7 California Institute of Technology8 Pennsylvania State University9 NASA Goddard Space Flight Center10 Lawrence Livermore National Laboratory11 Columbia University12 McGill University13 California Institute of Technology14 Pennsylvania State University15 NASA Goddard Space Flight Center
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, suggest 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.