Graduate What Are the Stationarity and Limitations of the Standard Accretion Disk Model?

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SUMMARY

The standard accretion disk model is considered stationary due to the assumption that the disk's structure and flow remain constant over time. However, this model has limitations, particularly regarding the thin disk approximation, which fails to account for variations in density and temperature throughout the disk. These approximations are not universally applicable, as real astrophysical disks exhibit complexities such as non-uniform radiation and gravitational influences. Understanding these limitations is crucial for accurate modeling in astrophysics.

PREREQUISITES
  • Understanding of the standard accretion disk model
  • Familiarity with astrophysical concepts such as density and temperature gradients
  • Knowledge of the thin disk approximation in astrophysics
  • Basic principles of gravitational dynamics in celestial mechanics
NEXT STEPS
  • Research the implications of non-stationary accretion disks in astrophysics
  • Study the effects of varying density and temperature in accretion disk models
  • Explore advanced models that address the limitations of the thin disk approximation
  • Investigate the role of radiation in the dynamics of accretion disks
USEFUL FOR

Astronomy students, astrophysicists, and researchers focusing on accretion disk dynamics and modeling in celestial mechanics.

AstroLove
hi I'm an astronomy student and i was studying the standard accretion disk model and I've got some questions related to it.!

why do we consider the accretion disk to be stationary in standard accretion disk model?
and what are the limitations of standard disk model?

and i just read somewhere that '' The thin disk approximation is not valid in the whole disk'' can anyone tell me why is it so?
 
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AstroLove said:
and i just read somewhere that '' The thin disk approximation is not valid in the whole disk'' can anyone tell me why is it so?

Most approximations are not completely valid. If Earth was a sphere there would be no mountains, no waves on the sea.

Also some things do not radiate perfectly.
 

Thread 'Galaxy MoM-z14 - furthest observed object'

https://en.wikipedia.org/wiki/MoM-z14 Any photon with energy above 24.6 eV is going to ionize any atom. K, L X-rays would certainly ionize atoms. https://www.scientificamerican.com/article/whats-the-most-distant-galaxy/ The James Webb Space Telescope has found the most distant galaxy ever seen, at the dawn of the cosmos. Again. https://www.skyatnightmagazine.com/news/webb-mom-z14 A Cosmic Miracle: A Remarkably Luminous Galaxy at zspec = 14.44 Confirmed with JWST...
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