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Lecture

Lecture 28

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Department
Physics
Course
PHYS 183
Professor
Tracy Webb
Semester
Winter

Description
PHYS 183 – The Milky Way Inside and Out – Tracy Webb Winter 2013 Lecture 28: March 22 , 2013  recall: blackholes are supernovas that continue to collapse  recall: mass tells space how to curve and space tells matter how to move  this is space-time  gravitational redshift o redshift is the stretching of light to longer wavelengths o each wavelength has a different energy associated o if a light is stretched to redshift it also has less energy o to get out of a blackhole you need enough energy  photon needs the same thing o light loses energy as it climbs out of a blackhole  infinite redshift o the light will be redshifted just from climbing out of the blackhole o this is something we can actually measure  time dilation o time is relative  you experience time at a different rate at different velocities o we can measure this with atomic clocks but not human beings o time slows down near a blackhole o slows to infinity at the event horizon o if you watched your friend fall into a blackhole time would slow down as they got closer to it and so you would never actually see them enter the blackhole  detecting blackholes in binaries  can see the matter spiralling in o can determine mass of accreting object & show it is >3 solar masses o in such a small area there is nothing else it could be  Cygnus X-1 is a blackhole we can see from Earth (not with your eyes)  x stands for x-ray force Chapter 20: Galaxies and Modern Cosmology  the Milky Way is the most famous galaxy in the universe o it is a spiral galaxy  looks like a pinwheel o different colours d
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