RXTE/PCA observation of the X-ray burster 1E1724-3045. Aperiodic variability of the persistent emission

Details RXTE/PCA observation of the X-ray burster 1E1724-3045. Aperiodic variability of the persistent emission RXTE/PCA observation of the X-ray burster 1E1724-3045. Aperiodic variability of the persistent emission

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..245b&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 245-248.

Physics

Nuclear Physics

Scientific paper

We report on the November 1996 Rossi X-ray Timing Explorer (RXTE) observation of the X-ray burster 1E1724-3045 with the Proportional Counter Array (PCA). The persistent, X-ray emission shows a high level of noise variability, the so-called High Frequency Noise (HFN), with a fractional Root Mean Squared (RMS) of ~25% in the 2x10-3-40Hz range (2-20keV). The Fourier Power Density Spectrum (PDS) can be modeled in terms of the sum of two ``shot noise'' components with two characteristic timescales of 680 and 16 msec. The PDS contains also a third component: a broad Quasi Periodic Oscillation-like (QPO) feature centered at 0.8Hz. Neither the shot timescales nor the QPO frequency do not vary with energy, whereas the integrated RMS of all three components shows a positive correlation. In addition, in the 2-20keV energy band, we found significant evidence for a high frequency component which shows up to 500Hz in the PDS. In terms of the shot noise model, a Lorentzian fit of this component implies a shot duration of about 1.4ms. The reality of this component has been tested with the help of simulations. Our observation of the burster 1E1724-3045 reveals timing properties, such as low frequency QPO and high level of RMS for the HFN, also displayed by Black Hole Candidates (BHC).

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