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Is black hole formed by supernova or hypernova?
Sujan, I should have told AllExperts I was on vacation. I am sorry to be so late.
When a star is more than about 20, yet less than 40 or 50 solar masses, at the end of its life, it goes supernova and then collapses into a black hole.
http://map.gsfc.nasa.gov/universe/rel_stars.html
http://adsabs.harvard.edu/abs/2003CQGra..20S..73F
http://adsabs.harvard.edu/abs/1999ApJ...522..413F
Hypernovae seem to always leave a black hole behind.
http://astronomy.swin.edu.au/cms/astro/cosmos/H/Hypernova
So, hypernovae always form black holes, and other supernovae often do.
Keep Looking Up,
-Ed
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Answers by Expert:
Ed
Expertise
I am not a professional astronomer by any means, but astronomy has been an interest of mine since childhood, and I am well-informed on the subject. If unable to answer someone`s question personally, I will know how to quickly find the answer online, because I keep myself informed about developments in the field and I know where to look for information.
Experience
I worked in an observatory for awhile at one point, doing various interesting things with a computer.
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