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

Takao Kitaguchi, Hongjun An, Andrei M. Beloborodov, Eric V. Gotthelf, Takayuki Hayashi, Victoria M. Kaspi, Vikram R. Rana, Steven E. Boggs, Finn Erland Christensen, William W. Craig, Charles J. Hailey, Fiona A. Harrison, Daniel Stern, Will W. Zhang

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Abstract

AE Aquarii is a cataclysmic variable with the fastest known rotating magnetized white dwarf (P-spin = 33.08 s). Compared to many intermediate polars, AE Aquarii shows a soft X-ray spectrum with a very low luminosity (L-X similar to 10(31) erg s(-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(-0.45)(+0.18), 2.29(-0.82)(+0.96), and 9.33(-2.18)(+6.07) keV, or an optically thin thermal plasma model with two temperatures of 1.00(-0.23)(+0.34) and 4.64(-0.84)(+1.58) keV plus a power-law component with photon index of 2.50(-0.23)(+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.
Original languageEnglish
Article number3
JournalAstrophysical Journal
Volume782
Issue number1
Number of pages7
ISSN0004-637X
DOIs
Publication statusPublished - 2014

Keywords

  • ASTRONOMY
  • X-RAY PULSATIONS
  • CATACLYSMIC VARIABLES
  • INTERMEDIATE POLARS
  • LINE DIAGNOSTICS
  • ACCRETION FLOWS
  • HOT PLASMA
  • XMM-NEWTON
  • EMISSION
  • TELESCOPE
  • SPECTRA
  • accretion, accretion disks
  • novae, cataclysmic variables
  • stars: individual (AE Aquarii)
  • white dwarfs
  • X-rays: stars
  • accretion accretion disks
  • Novae cataclysmic variables
  • Stars: individual (AE Aquarii)
  • White dwarfs
  • X-rays:stars

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