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Black Holes Cygnus X-I: Very much like classical binary. No pulsing Submilisecond flaring auto correction function One difference: wind fed Something has to happen at M>2.1 Msun. No other known force after neutron degeneracy collapse forever. SNR or WD, NS exceeds mass limit therefore collapse for light m=p/c
R is Schwarzshild Radius No information within this radius can escape Singularity is formed: Event horizon We can watch stuff fall in, to fall in takes forever. Properties: Mass Charge Angular Momentum All other information lost forever They have no magnetic field. They do not pulse Black holes have no hair How can we observe them? Put one in a binary system (as seen above) Accretion disk emits x-rays Orbital time ~ R/c Cygnus X-1 is the only black hole we are resonalbly certain of. No upper limit on mass can grow forever. Quasars (we think) form when enough mass is pulled into hole ~1-^ Msun Things are tidally disrupted and then swallowed. There may be one in our galaxy.
Thermal Radiation pair production at singularity Blackbody radiation Lose mass become lighter Burst or gamma rays not detected. Could have formed these in the early universe Primordial Black Holes
Gravitational Waves Birth ripple of a forming black hole detectors are being built
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