Accretion disc

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Artist's conception of a binary star system with one black hole and one main sequence star

An accretion disc is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a central body. The central body is typically a star. Gravity causes material in the disc to spiral inward towards the central body. Gravitational forces compress the material causing the emission of electromagnetic radiation. The frequency range of that radiation depends on the central object. Accretion discs of young stars and protostars radiate in the infrared; those around neutron stars and black holes in the X-ray part of the spectrum.

• See also: Wikipedia, Commons

• Related: Circumstellar disk, Solar Nebula, Dynamo Theory, Planetary ring, Spin-flip

Professor John F. Hawley homepage Professor John F. Hawley homepage www.astro.virginia.edu/~jh8h/ - Web

Nonradiative Black Hole Accretion Nonradiative Black Hole Accretion www.astro.virginia.edu/VITA/papers/nraf2/section1.html - Web

Accretion Discs on Scholarpedia Accretion Discs on Scholarpedia www.scholarpedia.org/article/Accretion_Discs - Web

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Magnetic fields snare black holes' food Magnetic fields snare black holes' food www.newscientistspace.com/.../article.ns?id=mg19025574.600&feedId=online-news_rss20 - Web

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