A turbulent model of time variability in X-ray binary pulsars

Abstract

view Abstract Citations (22) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Turbulent Model of Time Variability in X-Ray Binary Pulsars Hoshino, Masahiro ; Takeshima, Toshiaki Abstract It is found that the observed power spectral density of the aperiodic time variability of the X-ray pulsar can be approximated by a power-law spectrum which changes its slope at the pulsation frequency (pulsar rotation frequency). The indices of the observed spectra are, respectively, 1.4-2.0 above the pulsation frequency and 0-1.0 below the pulsation frequency. By studying the density fluctuation spectra with inverse cascades in magnetohydrodynamic turbulence, we find that the observed X-ray spectra can be interpreted as the density fluctuations in the accreting plasmas. It is shown that the structure of either disk-fed or wind-fed pulsars can be determined by comparing the observed X-ray spectra with the theoretical density fluctuation spectra of two- or three-dimensional magnetohydrodynamic turbulence, respectively. Publication: The Astrophysical Journal Pub Date: July 1993 DOI: 10.1086/186917 Bibcode: 1993ApJ...411L..79H Keywords: Magnetohydrodynamic Turbulence; Pulsars; Turbulence Models; X Ray Binaries; Accretion Disks; Neutron Stars; Power Spectra; Astrophysics; ACCRETION; ACCRETION DISKS; MAGNETOHYDRODYNAMICS: MHD; STARS: BINARIES: GENERAL; STARS: NEUTRON; TURBULENCE; X-RAYS: GENERAL full text sources ADS | data products SIMBAD (10)