Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Radius of the accretion disc?

  1. Jun 7, 2009 #1

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    What is the inner radius of an accretion disc?

    Is it simply the radius of the smallest possible orbit of a massive particle (the marginally stable radius), 6M ?
     
  2. jcsd
  3. Jun 8, 2009 #2
    Hi tiny-tim

    In most cases, the inner edge of the accretion disk is considered to coincide with the marginally stable which is 6M for a static black hole, reducing to 1M for a maximal Kerr black hole where a/M=1, though there seems to be some debate that the properties of the accretion disk itself can have an effect on this-

    A couple of links-

    'Where is a Marginally Stable Orbit in Luminous Accretion Disk' by Ken-ya Watarai Watarai, Shin Mineshige
    http://quasar.cc.osaka-kyoiku.ac.jp/~watarai/presen/KoreaPoster2004.pdf [Broken]

    'The radiation properties of an accretion disk with a non-zero torque on its inner edge' by Xinwu Cao, Y.D. Xu
    http://arxiv.org/abs/astro-ph/0211220

    'Black Hole Accretion Disks On The Edge' by Kristen Menou
    http://arxiv.org/abs/astro-ph/0304421
     
    Last edited by a moderator: May 4, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Radius of the accretion disc?
  1. Spinning disc (Replies: 15)

  2. Bondi Accretion (Replies: 7)

Loading...