Young black holes accreting from fallback disks

The prospects for the formation of a long lived fallback disk around a stellar mass black hole following a supernova explosion is discussed. The evolution of the disk is described in terms of its initial mass and angular momentum. The luminosity of the disk at the age of ∼ 10⁴ -10 ⁵ years is calculated. It is argued that a few such black holes can be detected in persistent states in the Galaxy, either in radiatively efficient or radiatively inefficient state. Fallback disks will have higher abundance of iron than disks in binary systems. This could make them suitable candidates for studying the strong gravity effects by measuring the Fe K lines.