Characterising anomalous transport in accretion disks from X-ray observations

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

2001-07-04

arxiv.org/abs/astro-ph/0107074v2

Astronomy and Astrophysics

Astrophysics

8 pages, 15 figures; the following now added: reference to instabilities, power spectra, log-normal distributions, explicit co

Scientific paper

10.1051/0004-6361:20020013

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 GRS1915+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 GRS1915+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.

Affiliated with

Also associated with

No associations

Rating

Characterising anomalous transport in accretion disks from X-ray observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Characterising anomalous transport in accretion disks from X-ray observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characterising anomalous transport in accretion disks from X-ray observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-652184