Time lags measurement of x-ray in its hard state from cyg x-1

Details Time lags measurement of x-ray in its hard state from cyg x-1 Time lags measurement of x-ray in its hard state from cyg x-1

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acasn..42..140q&link_type=abstract

Acta Astronomica Sinica, vol.42, no.2, p. 140-147.

Astronomy and Astrophysics

Astronomy

3

X-Ray Binaries, Fast Intensity Variability, Cyg X-1

Scientific paper

It is am important aspect of the high energy radiation to study time lag between two light curves with different energies. The Fourier cross spectrum used to estimate time lag between hard and soft X-ray photons. But Fourier technique can only give a significantly time lag less than 30 Hz in the hard state in Cyg X-1.The modified cross correlation function by Li Ti-Pei in the time domain can measure the rapid variability down to 1 ms time-scale. We analyse the hard time lags in hard state of Cyg X-1 in different observational segments by modified cross correlation function. Our results show that there are statistically significant time lags in time scales shorter than 0.1s.We compare the predications of different theoretical models of Cyg X-1 in its hard state with our results.

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