2004A&A...414.1091G


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST16:16:53

2004A&A...414.1091G - Astronomy and Astrophysics, volume 414, 1091-1104 (2004/2-2)

Long term variability of Cyg X-1. II. The rms-flux relation.

GLEISSNER T., WILMS J., POTTSCHMIDT K., UTTLEY P., NOWAK M.A. and STAUBERT R.

Abstract (from CDS):

We study the long term evolution of the relationship between the root mean square (rms) variability and flux (the ``rms-flux relation'') for the black hole Cygnus X-1 as monitored from 1996 to 2003 with the Rossi X-ray Timing Explorer (RXTE). We confirm earlier results by Uttley (2001MNRAS.323L..26U) of a linear relationship between rms and flux in the hard state on time scales >5s reflecting in its slope the fractional rms variability. We demonstrate the perpetuation of the linear rms-flux relation in the soft and the intermediate state. The existence of a non-zero intercept in the linear rms-flux relation argues for two lightcurve components, for example, one variable and one non-variable component, or a possible constant rms component. The relationship between these two hypothesized components can be described by a fundamental dependence of slope and intercept at time scales ≲10ksec with long term averages of the flux.

Abstract Copyright:

Journal keyword(s): black hole physics - stars: individual: Cyg X-1 - X-rays: binaries - X-rays: general

Status at CDS:  

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 863 0
2 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3888 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-16:16:53

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