ASTR-1010 Lecture Notes - Lecture 18: White Dwarf, Cygnus X-1, Gamma-Ray Burst
19 Mar 2017
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18. 2 neutron stars: are the lefto(cid:448)er (cid:272)ores fro(cid:373) super(cid:374)o(cid:448)a e(cid:454)plosio(cid:374)s, neutron stars are very dense (1012 g/cm3) In 9167, graduate student jocelyn bell and her advisor anthony hewish accidentally discovered a radio source in. Warping of space by gravity: gravity imposes a curvature on space, even though it has no mass, light is affected by gravity. Its path through space is bent: within the event horizon, it can not climb back out, as (cid:373)atter approa(cid:272)hes the e(cid:448)e(cid:374)t horizo(cid:374) , the tidal forces are tremendous, a(cid:374) o(cid:271)je(cid:272)t (cid:449)ould (cid:271)e (cid:862)spaghettified(cid:863) In the vicinity of black hole, time slows down. It heads straight into the black hole: light from the mother ship is blue-shifted. Finding black holes: then how do we know black holes exist, we detect them in x-ray binary stars. Chapter 18 big ideas: when they die, low-mass stars (like the sun) leave behind white dwarfs.
