Utilizing sophisticated simulation technology, researchers from UNIGE, Northwestern University, and the University of Florida have shed light on the enigmatic nature of these celestial 'beasts.' Black holes, among the universe's most mesmerizing phenomena, have a gravitational force so intense that
Nature AstronomyStellar-mass black holes are celestial objects born from the collapse of stars with masses of a few to low hundreds of times that of our sun. Their gravitational field is so intense that neither matter nor radiation can evade them, making their detection exceedingly difficult.
“As it is impossible to directly observe the formation of merging binary black holes, it is necessary to rely on simulations that reproduce their observational properties. We do this by simulating the binary-star systems from their birth to the formation of the binary black hole systems,” explains Simone Bavera, a post-doctoral researcher at the Department of Astronomy of the UNIGE’s Faculty of Science and leading author of this study.
POSYDON has overcome these limitations. Designed as open-source software, it leverages a pre-computed large library of detailed single- and binary-star simulations to predict the evolution of isolated binary systems. Each of these detailed simulations might take up to 100 CPU hours to run on a supercomputer, making this simulation technique not directly applicable for binary population synthesis.
“Models prior to POSYDON predicted a negligible formation rate of merging binary black holes in galaxies similar to the Milky Way, and they particularly did not anticipate the existence of merging black holes as massive as 30 times the mass of our sun. POSYDON has demonstrated that such massive black holes might exist in Milky Way-like galaxies,” explains Vicky Kalogera, a Daniel I.
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