Is a black hole accretion disk in a self-organized critical state?

Details Is a black hole accretion disk in a self-organized critical state? Is a black hole accretion disk in a self-organized critical state?

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435l.125m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 2, p. L125-L128

Astronomy and Astrophysics

Astronomy

68

Accretion Disks, Black Holes (Astronomy), Galactic Nuclei, Seyfert Galaxies, Stellar Mass Accretion, X Ray Stars, Mathematical Models, Neutron Stars, Power Spectra, Satellite-Borne Instruments, Three Dimensional Motion, X Ray Spectra

Scientific paper

In Mineshige et al. we have proposed that the inner portions of black hole accretion disks may be in a self-organized critical (SOC) state, thereby producing 1/f-like X-ray fluctuations (with f being a frequency) in spite of random mass input. The original model is modified so as to incorporate viscous diffusion process. Mass accretion, therefore, occurs either by an avalanche, which is triggered when the mass density of the disk exceeds some critical value, or by gradual gas diffusion. The model then produces 1/fbeta (with beta approximately 1.6) decline in the power spectrum, which is in good agreement with the observations that show a break to a steeper decline. We then discuss the observational features of the SOC state: (1) power spectra consisting of flat and power-law decline parts, (2) power-law-like peak-count distributions for individual shots and (3) non-random temporal distributions of very big shots. Detailed observational data analysis is urgently needed for confirmation.

Affiliated with

Also associated with

No associations

Rating

Is a black hole accretion disk in a self-organized critical state? 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 Is a black hole accretion disk in a self-organized critical state?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is a black hole accretion disk in a self-organized critical state? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1022394