Updated

Updated · Space.com · Jul 23

Study Links JWST Little Red Dots to 1,000-10,000-Solar-Mass Stars in Forming Globular Clusters

Updated

Updated · Space.com · Jul 23

Study Links JWST Little Red Dots to 1,000-10,000-Solar-Mass Stars in Forming Globular Clusters

Q: Did the Milky Way's black hole begin as a 'Little Red Dot' billions of years ago?

No one can say that the Milky Way’s central black hole, Sagittarius A*, definitely began as a “Little Red Dot.” The new JWST research makes it a plausible early-universe pathway for some supermassive black holes, but there is no direct evidence tying Sgr A* itself to that origin. What the new studies do show is that Little Red Dots appear to be compact, dust-enshrouded objects from the young universe, likely linked to rapidly forming massive black holes. Josephine Baggen’s team found that many of them sit near bright ultraviolet companions, which may have helped create supermassive stars that then collapsed directly into black holes. That would produce black hole “seeds” of roughly 100,000 to 1 million solar masses, large enough to help explain how giant black holes formed so quickly. That matters for the Milky Way because researchers say this process could have contributed to the earliest assembly of large galaxies, potentially including our own. In that broad sense, an LRD-like phase is a credible scenario for the kind of black hole seed that might later grow into Sagittarius A*. But the evidence remains circumstantial. The Milky Way’s black hole is much smaller than the most extreme early quasars, and astronomers do not have a direct observational record of its birth. So the careful answer is that the idea is scientifically plausible and increasingly interesting, but unproven. JWST has opened a possible origin story for Sgr A*; it has not confirmed it.

3 articles · Updated · Space.com · Jul 23

Little Red Dots seen about 600 million years after the Big Bang may be young globular clusters whose short-lived supermassive central stars make them appear as JWST’s compact red sources.
The model says stars of 1,000 to 10,000 solar masses could form through repeated collisions in dense early clusters, live roughly 1 million years, and forge the unusual helium- and metal-rich chemistry later seen in globular-cluster stars.
That scenario also offers an explanation for why the dots vanish before the universe reaches about 2 billion years old: once the supermassive star dies, the cluster could survive for billions of years without still looking like a Little Red Dot.
Researchers said the dots’ timing, estimated masses and apparent distribution all line up with modern globular clusters, though they stressed there is no single decisive proof and the study is currently an arXiv preprint.
The proposal adds a non-black-hole contender to a fast-growing debate over Little Red Dots, after recent studies argued they could instead be black hole stars or quasi-stars.

Sources

Space.com13h ago

Research: JWST's "Little Red Dots" are Evolving Globular Clusters with Supermassive Stars

Sky at Night Magazine1d ago

Fabrizio Gentile et al. Research Predicts Quasi-Star Appearance Matching JWST's "Little Red Dots"

Livescience.com3d ago

Josephine Baggen: JWST Reveals 'Little Red Dots' Formed by UV from Blue Companions

5 Sources

Did the Milky Way's black hole begin as a 'Little Red Dot' billions of years ago?

Do these objects solve the mystery of how giant black holes grew so big, so fast in the early universe?

Could these bizarre 'black hole stars' have been the first cradles for the chemistry of life?

The Rise and Mystery of Little Red Dots: How JWST is Transforming Our Understanding of Early Supermassive Black Hole Formation

Overview

The James Webb Space Telescope (JWST) has revealed a new class of objects called Little Red Dots (LRDs), which are compact, brilliant, and appear red because their light is stretched to longer wavelengths by the universe’s expansion. These LRDs are found mostly in the early universe, less than 10% of its current age, making them important for understanding cosmic history. Their extreme compactness and unique spectral features have sparked intense scientific interest, as they may hold clues to how massive objects like black holes formed soon after the Big Bang.

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