De största svarta hålen bildas genom upprepade sammanslagningar i stjärnhopar

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En ny analys av gravitationsvågsdata visar att universums tyngsta svarta hål uppstår genom multipla kollisioner inuti täta stjärnhopar istället för genom enstaka stjärnkollapser.

Forskare vid Cardiff University har undersökt 153 sammanslagningar av svarta hål som registrerats i version 4.0 av LIGO-Virgo-KAGRA Gravitational-Wave Transient Catalog. Deras studie, som publicerats i Nature Astronomy, identifierar två separata populationer av svarta hål. Objekt med lägre massa stämmer överens med förväntningarna om direkt bildande från döende stjärnor, medan de med högre massa uppvisar snabba rotationer i slumpmässiga riktningar, vilket stämmer överens med upprepade sammanslagningar i trånga miljöer där stjärnor ligger packade betydligt tätare än i närheten av solen.

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