When a star closely orbits a black hole, material from the star can flow into the black hole. As this material flows, it forms a hot, swirling disk of material that can emit X-rays. Jets can erupt from pressure that is generated by radiation in this hot system. This article explores the dynamics between the hot, swirling disk of material and the resulting jet that occurs in this system, helping astronomers better understand these objects.

http://www.raa-journal.org/raa/index.php/raa/article/view/1379