Encounters
Penrose Process ○｜encounter｜ENC｜20260912124217-00-•
Stage IV—Relate Black Hole Spin to the Penrose Process and Other Phenomena: A number of phenomena observed in astrophysical BHs have been argued to be associated with BH spin. The most notable examples are the explosive and relativistic radio jets associated with the hard-to-soft X-ray transition that occurs near the jet line (§4.3). Such ejections have been observed for at least eight BHBs and BHCs (Mirabel & Rodriguez 1999; Fender & Belloni 2004; McClintock & Remillard 2006 and references therein). Also, large-scale relativistic X-ray jets have been reported for XTE J1550–564 (Hannikainen et al. 2001; Corbel et al. 2002) and H 1743–322 (Corbel et al. 2005). For many years, scientists have speculated that these jets are powered by BH spin via something like the Penrose (1969) process, which allows energy to be milked from a spinning BH. Detailed models generally invoke magnetic fields (Blandford & Znajek 1977; Hawley & Balbus 2002; Meier 2003; McKinney & Gammie 2004). A number of beautiful ideas have been published along these lines, but there has been no way of testing or confirming them. Recently, however, some progress has been made on measuring BH spin, and it may soon be possible to attack the jet-spin/Penrose-process connection in earnest.
Source: Remillard & McClintock 2006 ┃ X-Ray Properties… ⚬𓂃
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