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Title: NuSTAR observations of magnetar 1E 1841–045

We report new spectral and temporal observations of the magnetar 1E 1841–045 in the Kes 73 supernova remnant obtained with the Nuclear Spectroscopic Telescope Array. Combined with new Swift and archival XMM-Newton and Chandra observations, the phase-averaged spectrum is well characterized by a blackbody plus double power law, in agreement with previous multimission X-ray results. However, we are unable to reproduce the spectral results reported based on Suzaku observations. The pulsed fraction of the source is found to increase with photon energy. The measured rms pulsed fractions are ∼12% and ∼17% at ∼20 and ∼50 keV, respectively. We detect a new feature in the 24-35 keV band pulse profile that is uniquely double peaked. This feature may be associated with a possible absorption or emission feature in the phase-resolved spectrum. We fit the X-ray data using the recently developed electron-positron outflow model by Beloborodov for the hard X-ray emission from magnetars. This produces a satisfactory fit, allowing a constraint on the angle between the rotation and magnetic axes of the neutron star of ∼20° and on the angle between the rotation axis and line of sight of ∼50°. In this model, the soft X-ray component is inconsistent with a singlemore » blackbody; adding a second blackbody or a power-law component fits the data. The two-blackbody interpretation suggests a hot spot of temperature kT ≈ 0.9 keV occupying ∼1% of the stellar surface.« less
Authors:
; ; ;  [1] ; ; ; ;  [2] ;  [3] ; ;  [4] ;  [5] ; ; ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] more »; « less
  1. Department of Physics, McGill University, Montreal, Quebec H3A 2T8 (Canada)
  2. Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
  3. Université de Toulouse, UPS-OMP, IRAP, Toulouse (France)
  4. Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)
  5. DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 327, DK-2800 Lyngby (Denmark)
  6. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)
  7. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  8. Space Science Office, ZP12, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)
  9. Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  10. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)
  11. Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)
Publication Date:
OSTI Identifier:
22348440
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ELECTRONS; EMISSION; HARD X RADIATION; HOT SPOTS; KEV RANGE; LIMITING VALUES; NEUTRON STARS; NEUTRONS; PHOTONS; POSITRONS; PULSARS; ROTATION; SOFT X RADIATION; SPECTRA; SUPERNOVA REMNANTS; SURFACES; TELESCOPES