Anna de Graaff's Team Identifies 11.9 Billion-Light-Year Cliff as Black Hole Star
Updated
Updated · Futura · Jul 1
Anna de Graaff's Team Identifies 11.9 Billion-Light-Year Cliff as Black Hole Star
1 articles · Updated · Futura · Jul 1
Summary
60 hours of spectral observations led Anna de Graaff's team to conclude the Cliff is not a young galaxy but a single supermassive black hole shrouded in dense hydrogen gas.
An unusually strong Balmer break—about twice what stellar models can produce—ruled out normal stars and explained why the object mimics one giant, very cold star.
The Cliff sits 11.9 billion light years from Earth, among the early-universe “little red dots” seen roughly 500 to 700 million years after the Big Bang that had defied galaxy-formation models.
The team argues such “black hole stars” could mark a rapid-growth phase that helps explain how modern galaxies built billion-solar-mass black holes so quickly, though other red dots still need testing.
Are the universe's first giant black holes hiding in plain sight, disguised as colossal, cold stars?
If 'black hole stars' are the seeds of modern galaxies, what does this reveal about our own cosmic origins?
Unveiling Black Hole Stars: How JWST’s "Little Red Dots" Are Rewriting Early Universe and Black Hole Growth Models
Overview
Astronomers have discovered mysterious 'little red dots' (LRDs) in the early universe that shine as brightly as giant stars. However, what powers these LRDs is still a puzzle. Researchers, including Anna de Graaff, find it hard to prove if a black hole sits at their core because each LRD is wrapped in a thick, dense envelope that hides its center. Despite this, the team believes black holes are responsible for the LRDs' extreme brightness. This idea is changing how scientists think about the early universe and the rapid growth of black holes soon after the Big Bang.