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Lecture 22

ASTR 3 Lecture 22: Notes 22: Black Holes 02

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Steven Furlanetto

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Lecture 22: Black hole part 02 Black hole: a warp in spacetime that is infinite deep. It would only be dangerous only assuming that we are not too close to it. Whats inside a black hole? Unknown due to break of the rules of general relativity. Finding the black holes: Eg. Cygnus X1. The first found in Xrays in the Cygnus constellation. 1. Keplers Third Law: measure a stars P and semimajor axis. If theres a large enough missing mass, theres likely a black hole, because neutron stars cant be much more than about 2 solar masses. 2. Look for light near the black hole. Accretion disc, pulling matter away from the companion star, an inward velocity from the gravitational pull makes the fast speed convert to heat, and hot things produce Xrays for us to observe. Gammaray bursts: The fusion results in an iron core, sometimes it produces gammaray bursts. Very luminous, as much energy as a supernovae. Forming jets of particles moving at the speed of light, shredding the star apart. Afterglow sometimes follows it. Jet explosions: hypernovae. Explosions of very massive stars. Appear as GRBs if jet points toward us, otherwise looks like supernovae. Long GRBs! The milky way and galaxies: The hubble ultradeep field: many many galaxies. The milky way: 3 basic constituents. Stars, gas, and dust. Younger stars (rich in heavy elements): Population I. Older stars (fewer heavy
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