Webb Spectrum Identifies GLIMPSE-17775 as Black Hole Star With 40-Plus Lines
Updated
Updated · Science@NASA · Jun 10
Webb Spectrum Identifies GLIMPSE-17775 as Black Hole Star With 40-Plus Lines
2 articles · Updated · Science@NASA · Jun 10
Summary
GLIMPSE-17775, a "little red dot" seen 1.8 billion years after the big bang, was identified as a supermassive black hole wrapped in dense gas in a study published in The Astrophysical Journal.
More than 40 spectral lines in Webb’s deepest little-red-dot spectrum — including 16 iron lines — pointed to a rapidly accreting black hole and a thick, partially ionized cocoon rather than a simple rotating gas cloud.
A 30-hour Webb observation, boosted by gravitational lensing from galaxy cluster Abell S1063 to an effective 80 hours, gave researchers the most detailed spectrum yet for this class of object.
Hubble data helped explain GLIMPSE-17775’s weaker-than-expected Balmer break by showing a large host galaxy, supporting a model in which starlight from the galaxy adds excess blue light.
The result strengthens the view that many little red dots can be explained by black-hole-star models, easing earlier concerns that these early-universe objects required galaxies or black holes to grow implausibly fast.
Are 'black hole stars' the missing link explaining how the first giant galaxies grew so quickly?
How did a cosmic magnifying glass help the Webb telescope uncover the true nature of mysterious 'little red dots'?
JWST’s Breakthrough Discovery: "Black Hole Stars" Explain Early Universe’s Supermassive Black Holes
Overview
The James Webb Space Telescope (JWST) has uncovered mysterious 'little red dots' in the early universe, sparking intense investigation among astronomers. These objects puzzled scientists until JWST's advanced spectroscopic analysis of GLIMPSE-17775 provided crucial data, connecting many pieces of the puzzle. The findings support the idea that these dots are 'black hole stars'—central black holes surrounded by dense, luminous disks that make them appear star-like. This breakthrough not only explains the unique nature of the 'little red dots' but also offers new insight into how supermassive black holes could have formed and grown rapidly in the early cosmos.