Notes covered in Exam3

Notes covered in Exam3 - What happens near a Black Hole G e...

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What happens near a Black Hole? General Properties of Black Holes Albert Einstein and General Relativity – Gravitational Radiation – Frame Dragging Orbiting a Black Hole Falling into a Black Hole Hawking Radiation from a Black Hole
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Masses of Black Holes Primordial - can be any size, including very small (If > 10 14 g, they would still exist; if < 10 14 g, vanished ) “Stellar Mass” black holes, at least 3 M o , many examples Intermediate mass black holes, 100’s to 1000’s M o Massive black holes, ~ 10 6 M o , e.g. center of Milky Way Supermassive Black Holes, ~ 10 8 - 10 10 M 0 , seen in centers of active galactic nuclei of galaxies and as quasars.
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Black Hole Structure Schwarzschild radius defines the event horizon R Sch = 2GM/c 2 Nothing can escape, once it has crossed the event horizon Cosmic censorship: you cannot see inside the event horizon
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The First Black Hole Discovered Cygnus X-1 binary system (stellar mass BH) Most likely mass is 16(+/-5) M 0 Mass determined by Doppler shift measurements of spectral lines
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Binary Star Systems Often stars are formed in binary systems When components have unequal masses, the more massive star will evolve faster and may become a supernova. In some cases, the supernova of the primary star will not disrupt the binary system and a compact binary is formed. Mass transfer can then occur from the main sequence star onto the collapsed, compact companion star, which can be a neutron star or a black hole.
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Milky Way’s Central Black Hole Best evidence comes from IR measurements of stellar
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