AST201H1 Lecture Notes - Lecture 6: Cygnus X-1, Event Horizon, Radiography

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AST201H1 Full Course Notes
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AST201H1 Full Course Notes
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A supernova is an explosion of a star, which tears it apart in seconds. Sometimes when a star is very close the supernova can be seen during the day. In order to locate a black hole we look for objects orbiting something that cannot be seen. First conclusive bit of evidence for the existence of black holes came from people at uoft. Noticed objects were orbiting something that wasn"t there. By working out the orbit of the star they were able to work out the mass of the invisible object. The x-rays we see coming from cygnus x-1 is hot material just outside the event horizon escapes them. Not coming from the black hole itself, black holes emit nothing since nothing. Has a mass 15 times greater than the sun and its schwarzschild radius is only 44 km. There is a much larger kind of black hole that live at the centre at some, if not all, galaxies.

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