A new computer model is uncovering new the clues.
, which was so powerful that it must have been triggered by a collision that gave rise to a black hole much larger than the upper limit for stellar black holes. However, at the same time, the object was nowhere near enough massive to be a galactic supermassive black hole. Even before the detection of GW190521, astrophysicists hypothesized that such mid-sized black holes must exist, as they would provide the missing link between the two observed varieties.
A new study now suggest that that medium-sized black hole could also have been born from a collision of two giant stars The team in this new study began its simulation with two stars: one very young hydrogen-burning star about 40 times as massive as the sun and one older star with a mass of about 60 suns. The older star is in the later,of its evolution, when stars burn helium in their core and balloon to sizes hundreds of times greater than their original size.
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