Jets of material spewed out from massive black holes also rise where the remnant of a collapsed star remains bound to its binary companion star. EU-funded scientists observed jets from such X-ray binaries to shed light on how relativistic jets are produced.
In X-ray binaries, mass is normally accreted from the star rotating around the black hole or neutron star in the form of a disk. The innermost regions of this accretion disk are so hot that the temperatures exceed one million degrees and emit X-rays.
Further details: Galactic jets and their engines