NASA Discovers X-ray Source Shedding Light on Early Universe 'Little Red Dots'

Note: Single-source report; awaiting corroboration.

A newly identified X-ray source, 3DHST-AEGIS-12014, located approximately 11.8 billion light-years from Earth, may help clarify the nature of 'little red dots' (LRDs)—a mysterious class of distant objects recently found by the James Webb Space Telescope (JWST) and studied with NASA's Chandra X-ray Observatory.

LRDs are small, red-hued sources observed about 12 billion light-years away. They are thought to be supermassive black holes enshrouded in dense gas, which obscures typical electromagnetic signatures, including X-rays and ultraviolet light usually seen in active black holes. This scenario, called the 'black hole star' model for LRDs, suggests these are atypical supermassive black holes hidden by gas.

The X-ray dot 3DHST-AEGIS-12014 displays most features of an LRD but uniquely emits X-ray radiation—a distinguishing feature not seen in other LRDs. Researchers propose this object represents a transitional stage from an obscured black hole star to a conventional, visible supermassive black hole. In this phase, gaps in the surrounding gas allow X-rays to escape and be detected by Chandra.

Scientists suggest that as the black hole star consumes its surrounding gas, these gaps open up, marking its evolution toward a less obscured black hole. Eventually, the dense gas is depleted, ending the black hole star phase. This discovery may offer key insights into how early universe supermassive black holes evolve and help bridge gaps between LRDs and known black hole types.

Lead author Raphael Hviding of the Max Planck Institute for Astronomy said this X-ray source could help astronomers connect LRDs to established observations of black hole growth. Co-author Anna de Graaff from the Center for Astrophysics | Harvard & Smithsonian highlighted that the unique X-ray emission provides important information about the nature of little red dots.