One hundred black holes were immediately found in a globular cluster: they make up 20% of its mass

We are talking about the globular cluster Palomar 5, which is located in the constellation Serpent at a distance of 76 thousand light

years from Earth. The authors of the new work estimated the number and mass of black holes in a globular cluster in order to understand where the merging of black holes occurs.

Astrophysicists have long assumed that mostmergers of black holes occur in globular star clusters, but until recently, scientists did not know how many there could be. Thanks to our observation technique, similar information can be obtained for other objects.

Fabio Antonini, study author and research fellow at Cardiff University

Antonini and his colleagues tried to reproducethe process of formation of stellar streams. Based on detailed images of Palomar 5, they created a computer model of the cluster, which repeats 11.5 billion years of its existence.

As a result, the authors came to the conclusion thatthe structure of a cluster can exist only if there are about 100-120 black holes in its center, 17-20 times the mass of the sun. This number of black holes is about three times more than the average number for the Milky Way.

Such discrepancies, in turn, are associated withthe fact that black holes constantly eject stars from a globular cluster, but they themselves leave it extremely rarely, which at the same time increases the density of their number.

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