Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..110..583v&link_type=abstract
Astronomy and Astrophysics Supplement, v.110, p.583
Astronomy and Astrophysics
Astrophysics
X-Rays: General, Data Analysis
Scientific paper
Calculations have been carried out to simulate the effect that data overflows have on X-ray timing observations when the data values are binned in equal time intervals, as is anticipated for some bright X-ray sources in the USA experiment (Wood et al. 1993). Simulated data sets have been generated with Poisson noise and two 5% amplitude cosine waves which were then subject to standard Fast Fourier Transform (FFT) analysis. This was done for a series of average count rates and 1-bit, 2-bit, and 4-bit "data" values, assuming that any overflows would reset the counter to zero. We find that overflows produce a significantly worse loss of sensitivity for 1-bit data recording than for 2-bit data recording. In both cases a factor of 10 power response loss occurs when the dimensionless parameter x =S_0DELTAt/(2^n^-1) (where S_0_ is the mean source count rate, {DELTA}t is the time sampling interval, and n is the number of data bits available) is 0.65, but for n=2 the loss of response is more gradual up until x=~0.5. With Poisson noise the effect of overflows can be seen from the mean value of the power spectrum if the normalization of Leahy et al. (1983) is used.
Leahy Denis A.
Volk Kathryn
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