Abstract
The rms (root mean square) variability is the parameter for understanding the emission temporal properties of X-ray binaries (XRBs) and active galactic nuclei (AGN). The rms–flux relation with Rossi X-ray Timing Explorer (RXTE) data for the dips and nondip of black hole Cyg X-1 has been investigated in this paper. Our results show that there exist the linear rms–flux relations in the frequency range 0.1–10 Hz for the dipping light curve. Moreover, this linear relation still remains during the nondip regime, but with the steeper slope than that of the dipping case in the low energy band. For the high energy band, the slopes of the dipping and nondipping cases are hardly constant within errors. The explanations of the results have been made by means of the “Propagating Perturbation” model of Lyubarskii (Lyubarskii, Y.E., Mon. Not. Roy. Astron. Soc. 292, 679–685 (1997)).
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References
Arévalo, P., Uttley, P.: Investigating a fluctuating-accretion model for the spectral-timing properties of accreting black hole systems. Mon. Not. Roy. Astron. Soc. 367, 801–804 (2006)
Asai, K., Dotani, T., Nagase, F., Mitsuda, K.: Iron K emission lines in the energy spectra of low-mass X-ray binaries observed with ASCA. Astrophys. J. Suppl. Ser. 131, 571–591 (2000)
Balucińska-Church, M., Takahashi, T., Ueda, Y., Church, M.J., Dotani, T., Mitsuda, K., Inoue, H.: The cessation of flickering during dips in Cygnus X-1. Astrophys. J. 480, L115–L119 (1997)
Belloni, T., Hasinger, G.: Variability in the noise properties of Cygnus X-1. Astron. Astrophys. 227, L33–L36 (1990)
Belloni, T., Psaltis, D., van der Klis, M.: A unified description of the timing features of accreting X-ray binaries. Astrophys. J. 572, 392–406 (2002)
Churazov, E., Gilfanov, M., Revnivtsev, M.: Soft state of Cygnus X-1: stable disc and unstable corona. Mon. Not. Roy. Astron. Soc. 321, 759–766 (2001)
Church, M.J.: The emission regions in X-ray binaries: dipping as a diagnostic. Adv. Space Res. 28, 323–335 (2001)
Done, C., Gierliński, M.: Observing the effects of the event horizon in black holes. Mon. Not. Roy. Astron. Soc. 342, 1041–1055 (2003)
Feng, Y.X., Cui, W.: Discovery of two types of X-ray dips in Cygnus X-1. Astrophys. J. 564, 953–961 (2002)
Focke, W.B., Wai, L.L., Swank, J.H.: Time domain studies of X-ray shot noise in Cygnus X-1. Astrophys. J. 633, 1085–1094 (2005)
Frank, J., King, A.R., Raine, D.J.: Accretion Power in Astrophysics. Cambridge University Press, Cambridge (1992)
Gleissner, T., Wilms, J., Pottschmidt, K., Uttley, P., Nowak, M.A., Staubert, R.: Long term variability of Cyg X-1. II. The rms–flux relation. Astron. Astrophys. 414, 1091–1104 (2004)
King, A.R., Pringle, J.E., West, R.G., Livio, M.: Variability in black hole accretion discs. Mon. Not. Roy. Astron. Soc. 348, 111–122 (2004)
Kotov, O., Churazov, E., Gilfanov, M.: On the X-ray time-lags in the black hole candidates. Mon. Not. Roy. Astron. Soc. 327, 799–807 (2001)
Lochner, J.C., Swank, J.H., Szymkowiak, A.E.: Shot model parameters for Cygnus X-1 through phase portrait fitting. Astrophys. J. 376, 295–311 (1991)
Lyubarskii, Y.E.: Flicker noise in accretion discs. Mon. Not. Roy. Astron. Soc. 292, 679–685 (1997)
Maccarone, T.J., Coppi, P.S., Poutanen, J.: Time domain analysis of variability in Cygnus X-1: constraints on the emission models. Astrophys. J. 537, L107–L110 (2000)
Manmoto, T., Takeuchi, M., Mineshige, S., Matsumoto, R., Negoro, H.: X-ray fluctuations from locally unstable advection-dominated disks. Astrophys. J. 464, L135–L138 (1996)
McHardy, I.M., Papadakis, I.E., Uttley, P., Page, M.J., Mason, K.O.: Combined long and short time-scale X-ray variability of NGC 4051 with RXTE and XMM-Newton. Mon. Not. Roy. Astron. Soc. 348, 783–801 (2004)
Miyamoto, S., Kitamoto, S., Iga, S., Negoro, H., Terada, K.: Canonical time variations of X-rays from black hole candidates in the low-intensity state. Astrophys. J. 391, L21–L24 (1992)
Miyamoto, S., Kitamoto, S., Mitsuda, K., Dotani, T.: Delayed hard X-rays from Cygnus X-1. Nature 336, 450–452 (1988)
Negoro, H., Kitamoto, S., Takeuchi, M., Mineshige, S.: Statistics of X-ray fluctuations from Cygnus X-1: reservoirs in the disk? Astrophys. J. 452, L49–L52 (1995)
Poutanen, J., Fabian, A.C.: Spectral evolution of magnetic flares and time lags in accreting black hole sources. Mon. Not. Roy. Astron. Soc. 306, L31–L37 (1999)
Shirey, R.E., Levine, A.M., Bradt, H.V.: Scattering and iron fluorescence revealed during absorption dips in Circinus X-1. Astrophys. J. 524, 1048–1058 (1999)
Stern, B.E., Svensson, R.: Evidence for “Chain Reaction” in the time profiles of gamma-ray bursts. Astrophys. J. 469, L109–L113 (1996)
Uttley, P.: SAX J1808.4-3658 and the origin of X-ray variability in X-ray binaries and active galactic nuclei. Mon. Not. Roy. Astron. Soc. 347, L61–L65 (2004)
Uttley, P., McHardy, I.M.: The flux-dependent amplitude of broadband noise variability in X-ray binaries and active galaxies. Mon. Not. Roy. Astron. Soc. 323, L26–L30 (2001)
Uttley, P., McHardy, I.M., Vaughan, S.: Non-linear X-ray variability in X-ray binaries and active galaxies. Mon. Not. Roy. Astron. Soc. 359, 345–362 (2005)
van der Klis, M.: Timing neutron stars. In: Ögelman, H., van den Heuvel, E.P.J. (eds.) NATO ASI No. C262, p. 270. Kluwer, Dordrecht (1989)
van der Klis, M.: Similarities in neutron star and black hole accretion. Astrophys. J. Suppl. Ser. 92, 511–519 (1994)
Vaughan, S., Fabian, A.C., Nandra, K.: X-ray continuum variability of MCG-6-30-15. Mon. Not. Roy. Astron. Soc. 339, 1237–1255 (2003a)
White, N., Nagase, F., Parmar, A.N.: In: Lewin, W.G.H., van Paradijs, J., van den Heuvel, E.P.J. (eds.) X-ray Binaries, p. 1. Cambridge University Press, Cambridge (1995)
Zhang, S.-N.: Similar phenomena at different scales: Black holes, the Sun, Gamma-Ray Bursts, Supernovae, Galaxies and Galaxy clusters. Paper presented at the 26th IAU GA, Prague, Czech Republic, August 2006
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Lei, YJ., Song, LM., Qu, JL. et al. Rms–flux relation of Cyg X-1 with RXTE: dipping and nondipping cases. Astrophys Space Sci 310, 307–315 (2007). https://doi.org/10.1007/s10509-007-9534-4
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DOI: https://doi.org/10.1007/s10509-007-9534-4