Aperiodic variability of the X-ray burster 1E1724-3045: First results from RXTE/PCA

Details Aperiodic variability of the X-ray burster 1E1724-3045: First results from RXTE/PCA Aperiodic variability of the X-ray burster 1E1724-3045: First results from RXTE/PCA

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..724o&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 724-728 (1997).

Computer Science

X-Ray Sources, X-Ray Bursts, X-Ray, Globular Clusters In The Milky Way, Black Holes

Scientific paper

The X-ray burster 1E1724-3045, located in the globular cluster Terzan 2 was observed on November 1996 for 100 ksec with the PCA and HEXTE experiments aboard the Rossi X-ray Timing Explorer. During the observation, the PCA count rate was about 470 cts/s in the 2-20 keV range (background substracted). We have characterized the aperiodic variability of the source over a wide frequency band (2 10-3-40 Hz). The 2-20 keV emission of this source shows a light level of noise variability (RMS ~25%). The Fourier spectrum can be modelled in terms of the shot noise model with two characteristic lifetimes of 670 and 16 msec although a continuous distribution of shots lifetimes can not be excluded. These two components account for about the same contribution to the total RMS of the source (~10%). In addition to these components, a broad and asymetric peaked noise feature, located at 0.8 Hz, appears in the spectrum. This QPO-like feature accounts for a ~5% of the RMS. Both the lifetimes of the shots and the QPO frequency seems independent on the energy but the integrated RMS of all three components increases between the 2-5 keV and 5-20 keV range. We show that 1E1724-3045 has striking timing similarities with the black hole candidate GRO J0422+32 (Nova Persei 1992).

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