Three images of black holes as black circles with orange accretion disks around them and a plot of the iron X-ray absorption line beneath them. In the first case, the hole has fast prograde spin (spins in the same direction as disk) which is indicated by arrows, and the Fe line is stumpy. In the middle, the BH has no spin and the accretion disk is slightly farther from it, and the Fe line is less stumpy. In the third case, the BH has fast retrograde spin and the accretion disk is very far away, and the Fe line is very tall and noticeable.
Discover more from astrobites
Subscribe to get the latest posts to your email.
