Similar Shot Noise in CYG X-1, GROJ 0422+32 and 1E 1724-3045

Astronomy and Astrophysics – Astrophysics

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Scientific paper

We study the rapid variability in Cyg X-1 observed with RXTE/PCA on Jan 17 and 20 of 1997. The power spectrum below 200 Hz can be characterized by two "shot noise" components and a peaked noise at 0.2 Hz. This is similar to those "shot noise" observed in another black hole candidate GRO J0422+32 and a neutron star X-ray binary 1E 1724-3045. We compare the shot noise in these different X-ray binaries. Our result suggests that the mechanism of shots is similar in both black hole systems and neutron star systems, and in high mass X-ray binaries and low mass X-ray binaries.

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