Accretion disks form around compact objects in binary systems when matter from the companion star falls into the gravitational influence of the comnpact object and forms a disk of gas and plasma that swirls about the object. Parts of this disk can get hot enough to emit x-rays.
The justification for accretion power
Accretion onto white dwarfs and neutron stars
Radiation-matter interactions in accretion disks
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