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Title: NuSTAR and swift observations of the fast rotating magnetized white dwarf AE Aquarii

AE Aquarii is a cataclysmic variable with the fastest known rotating magnetized white dwarf (P {sub spin} = 33.08 s). Compared to many intermediate polars, AE Aquarii shows a soft X-ray spectrum with a very low luminosity (L {sub X} ∼ 10{sup 31} erg s{sup –1}). We have analyzed overlapping observations of this system with the NuSTAR and the Swift X-ray observatories in 2012 September. We find the 0.5-30 keV spectra to be well fitted by either an optically thin thermal plasma model with three temperatures of 0.75{sub −0.45}{sup +0.18}, 2.29{sub −0.82}{sup +0.96}, and 9.33{sub −2.18}{sup +6.07} keV, or an optically thin thermal plasma model with two temperatures of 1.00{sub −0.23}{sup +0.34} and 4.64{sub −0.84}{sup +1.58} keV plus a power-law component with photon index of 2.50{sub −0.23}{sup +0.17}. The pulse profile in the 3-20 keV band is broad and approximately sinusoidal, with a pulsed fraction of 16.6% ± 2.3%. We do not find any evidence for a previously reported sharp feature in the pulse profile.
Authors:
 [1] ; ;  [2] ; ; ;  [3] ;  [4] ; ;  [5] ; ;  [6] ;  [7] ;  [8] ;  [9]
  1. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  2. Department of Physics, McGill University, Rutherford Physics Building, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada)
  3. Physics Department and Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
  4. The Institute of Space and Astronautical Science/JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara 252-5210 (Japan)
  5. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)
  6. Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)
  7. DTU Space-National Space Institute, Technical University of Denmark, Elektrovej 327, DK-2800 Lyngby (Denmark)
  8. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)
  9. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
22348074
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 782; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; APPROXIMATIONS; COMPARATIVE EVALUATIONS; KEV RANGE; LUMINOSITY; NOVAE; PHOTONS; PLASMA; SOFT X RADIATION; SPECTRA; WHITE DWARF STARS