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On the time variability of Circinus X-1 - A comparison with Cygnus X-1 (1980)

Sutherland, P. G. ; Weisskopf, M. C.

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Publication Date: 2011-08-17

Description: The time variability and spectral characteristics obtained from Uhuru observations of Cir X-1 (4U 1515-56) are compared with observations of Cyg X-1 (4U 1956+35). It is found that Cir X-1 has a more variable spectrum (with perhaps a state over the 4 days spanned by the data), is less 'noisy', and has correlated fluctuations (as evidenced by the nonzero cross-correlation function between two energy bands) of shorter duration than those present in the shot noise of Cyg X-1.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal; vol. 236

Format: text

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