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5.1 Collapse scenario

UpdateJump To The Next Update Information The first generation of stars to form in the early universe are known as Population III stars (formed at redshifts z >~~ 5). Theoretical and computational evidence suggests that Population III stars may have had masses >~~ 100 Mo . [2Jump To The Next Citation Point1Jump To The Next Citation Point96Jump To The Next Citation Point]. Since these massive stars contained no metals, it was possible for them to form directly and then evolve with very low stellar winds and thus very little mass loss. If the mass of a nonrotating Population III star is >~~ 260Mo., its fate is to collapse directly to a black hole at the end of its life [96Jump To The Next Citation Point]. If rotational support prevents the star from direct collapse to a black hole, explosive thermonuclear burning will cause the star to undergo a giant hypernova explosion. Prior to black hole formation, the rotating, collapsed core will have a mass of 50 -70 Mo . and a radius of 1000 - 2000 km. Note that because these massive stars evolve so quickly (in a few million years [10]), the events associated with their deaths will take place at roughly the redshifts of their births.
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