Cambridge scientists discover massive black holes formed before galaxies in early universe
The findings challenge previous black hole formation theories
A groundbreaking study by Cambridge researchers has shown that some supermassive black holes in the early universe might have existed before their host galaxies fully formed.
The research team, led by experts from the University of Cambridge's Cavendish Laboratory and Kavli Institute for Cosmology, used the James Webb Space Telescope to observe the distant space anomaly, Abell2744-QSO1 (QSO1).
Observing through the Lens
QSO1 is a Little Red Dot located more than 13 billion light-years away, appearing just 700 million years post-Big Bang.
Thanks to gravitational lensing by the galaxy cluster Abell 2744, researchers have been able to study QSO1 in greater detail despite its colossal distance.
The team identified the entity as a glowing cloud of hydrogen and helium gases swirling about a black hole estimated to be 50 million times the mass of the Sun.
“This is a remarkable finding,” said Professor Roberto Maiolino from Cambridge’s Cavendish Laboratory, who co-authored two studies published on the topic.
Mapping Mass and Motion
Using Webb's Near Infrared Spectrograph, Cambridge researchers, including PhD student Ignas Juodžbalis and Cosimo Marconcini from the University of Florence, mapped the movement of gases around QSO1's black hole.
They noted the gases followed Keplerian rotation, indicating the majority of QSO1’s mass is concentrated in the black hole rather than being spread out, as would be seen if stars populated the host galaxy.
This direct measurement found that the black hole accounts for two-thirds of QSO1’s total mass, much higher than typical nearby galaxies.
A Lack of Stars
Additionally, the environment surrounding QSO1 showed significantly low metallicity, less than 0.5% of the Sun, pointing to a lack of other elements typically present due to stellar activity.
"We've found a black hole that does not have a substantial host galaxy," Juodžbalis noted, pointing to evidence that QSO1 predates stellar processes.
The study challenges the assumption that black holes grew from smaller seeds merging over time, lending credence to the theory of primordial black holes forming independently.
Thought by some to have formed from heavy seeds at the universe's dawn, QSO1 might represent the early stages of a galaxy building itself around a massive black hole.
Future Implications
The findings suggest supermassive black holes may have been common in the universe's early years, raising critical questions about their formation and relationship with galaxies.
The Cambridge team is currently analysing similar structures to better understand these anomalies.
The James Webb Space Telescope, a collaboration led by NASA with ESA and CSA partners, continues to provide vital data that sheds light on the universe's evolutionary history.