Query : 2002A&A...385..693G

2002A&A...385..693G - Astronomy and Astrophysics, volume 385, 693-700 (2002/4-2)

Characterising anomalous transport in accretion disks from X-ray observations.


Abstract (from CDS):

Whilst direct observations of internal transport in accretion disks are not yet possible, measurement of the energy emitted from accreting astrophysical systems can provide useful information on the physical mechanisms at work. Here we examine the unbroken multi-year time variation of the total X-ray flux from three sources: Cygnus X-1, the microquasar GRS 1915+105, and for comparison the nonaccreting Crab nebula. To complement previous analyses, we demonstrate that the application of advanced statistical methods to these observational time-series reveals important contrasts in the nature and scaling properties of the transport processes operating within these sources. We find the Crab signal resembles Gaussian noise; the Cygnus X-1 signal is a leptokurtic random walk whose self-similar properties persist on timescales up to three years; and the GRS 1915+105 signal is similar to that from Cygnus X-1, but with self-similarity extending possibly to only a few days. This evidence of self-similarity provides a robust quantitative characterisation of anomalous transport occuring within the systems.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - methods: statistical - X-rays: general

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 1 SNR 05 34 30.9 +22 00 53           ~ 6056 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5136 0
3 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2530 0
4 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4228 0

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