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An '''accretion disk''' is the term for a rapidly rotating disk of material that forms around a high-mass compact object, often a [[black hole]]. Accretion disks can also be associated with other high mass, compact objects such as [[white dwarf]] stars and [[neutron stars]].<ref>[http://solarsystem.nasa.gov/dictionary/index.cfm?Display=Dictionary&Letter=A NASA Dictionary].</ref> In order to conserve angular momentum, as material in the disk moves towards the central mass, it's rotational speed increases as does it's temperature. As a result, accretion disks often emit radiation in the [[x-ray]] and [[gamma ray]] portions of the electromagnetic spectrum.

An '''accretion disk''' is the term for a rapidly rotating disk of material that forms around a high-mass compact object, such as a [[white dwarf]] star or [[neutron star]].<ref>[http://solarsystem.nasa.gov/dictionary/index.cfm?Display=Dictionary&Letter=A NASA Dictionary].</ref> In order to conserve angular momentum, as material in the disk moves towards the central mass, its rotational speed increases as does its temperature. As a result, accretion disks often emit radiation in the [[x-ray]] and [[gamma ray]] portions of the electromagnetic spectrum.

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[[Category:Astronomy]]

[[Category:Astronomy]]