Astronomers discovered a black hole unlike any other
Astronomers detected a black hole hiding in a huge star cluster in our nearest neighboring galaxy, Andromeda-B023-G078. Unlike any other black hole, this one-hundred thousand solar mass black hole is smaller but larger than those created when stars burst.
As a result, the black hole is the only known intermediate-mass black hole.
B023-G078 was thought to be a massive star cluster. However, experts argue that it is a stripped nucleus. Stripped nuclei are the remains of tiny galaxies that interacted with larger ones and had their surrounding stars stripped away by gravitational forces.
“Previously, we’ve seen enormous black holes amid gigantic, stripped nuclei that are far bigger than B023-G078,” said lead author Renuka Pechetti of Liverpool John Moores University, who started the research while at the U. We knew that smaller black holes must exist in lower mass stripped nuclei, but there has never been direct confirmation. “I believe this is a very clear situation in which we have finally discovered one of these items.”
“I knew the B023-G078 object was one of the most massive objects in Andromeda and felt it may be a possibility for a stripped nucleus,” Seth explained. But we needed evidence to back it up. For many years, we’d tried to secure more observations from other telescopes, but my suggestions had always been rejected. When we detected a supermassive black hole within a stripped nucleus in 2014, the Gemini Observatory provided us with the opportunity to investigate the concept.”
The scientists gathered data from Gemini Observatory as well as photos from the Hubble Space Telescope for this investigation. They approximated the mass distribution within B023-G078 using the data by modeling its light profile.
A globular cluster’s light profile has the same form at the core as it does in the outlying areas. B023-G078 is unique. The light in the middle is circular and gradually flattens as it moves outwards. The chemical composition of the stars varies as well, with more heavy elements in the stars in the object’s center than in those near the object’s border.
“Globular star clusters form at the same time,” Seth explained. These stripped nuclei, on the other hand, can undergo multiple formation periods in which gas descends into the core of the galaxy and generates stars. Other star clusters may be drawn into the center of the galaxy by the galaxy’s gravitational forces. It serves as a sort of dumping ground for a variety of items. As a result, stars with stripped nucleus will be more complex than globular clusters. That’s exactly what we witnessed in B023-G078.”
Using the mass distribution of the object, the scientists calculated how rapidly the stars should move at any given point inside the cluster. They then matched it to their own information. They discovered that the fastest stars were circling near the center.
When scientists created a model without a black hole, the stars in the center moved too slowly in comparison to their observations. When they introduced the black hole, they obtained speeds that corresponded to the data. The black hole strengthens the case that this item is a stripped nucleus.
“The stellar velocities we’re seeing provide us direct proof that there’s some dark matter right at the core,” Pechetti added. It is difficult for globular clusters to create large black holes. But if it’s in a stripped nucleus, there must already be a black hole there, left behind from the tiny galaxy that collided with the larger one.”
“We know giant galaxies arise from the merger of smaller galaxies,” Seth explained, “but these stripped nuclei allow us to reconstruct the specifics of those earlier encounters.”