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Record 1 of 40596
Energy Spectra and High Frequency Oscillations in 4U 0614+091
External Online Source: doi:10.1086/310827
Author and Affiliation:
Ford, E. C.(Columbia Univ., Dept. of Physics, New York, NY United States)
Kaaret, P.(Columbia Univ., Dept. of Physics, New York, NY United States)
Chen, K.(Columbia Univ., Dept. of Physics, New York, NY United States)
Tavani, M.(Columbia Univ., Dept. of Physics, New York, NY United States)
Barret, D.(Centre d'Etude Spatiale des Rayonnements, Toulouse, France)
Bloser, P.(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Grindlay, J.(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Harmon, B. A.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Paciesas, W. S.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Zhang, S. N.(NASA Marshall Space Flight Center, Huntsville, AL United States)
Abstract: We investigate the behavior of the high frequency quasi-periodic oscillations (QPOs) in 4U 0614+091, combining timing and spectral analysis of RXTE (Rossi X-ray Timing Explorer) observations. The energy spectrum of the source can be described by a power law plus a blackbody component. The blackbody has a variable temperature (kT approximately 0.8 to 1.4 keV) and accounts for 10 to 25% of the total energy flux. The power law flux and photon index also vary (F approximately 0.8 to 1.6 x 10(exp -9) erg/sq cm.s and alpha approximately 2.0 to 2.8 respectively). We find a robust correlation of the frequency of the higher frequency QPO with the flux of the blackbody. The source follows the same relation even in observations separated by several months. The QPO frequency does not have a similarly unique correlation with the total flux or the flux of the power law component. The RMS amplitudes of the higher frequency QPO rise with energy but are consistent with a constant for the lower frequency QPO. These results may be interpreted in terms of a beat frequency model for the production of the high frequency QPOs.
Publication Date: Jan 01, 1997
Document ID:
19990088432
(Acquired Oct 22, 1999)
Subject Category: ASTROPHYSICS
Document Type: Reprint
Publication Information: Astrophysical Journal
Publisher Information: University of Chicago Press, Chicago, IL, United States
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ENERGY SPECTRA; SPECTRUM ANALYSIS; SPECTRAL EMISSION; TIME DOMAIN ANALYSIS; HIGH FREQUENCIES; OSCILLATIONS; FLUX DENSITY; BEAT FREQUENCIES; X RAY TIMING EXPLORER
Availability Source: Other Sources
Availability Notes: Abstract Only;
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