The little red dots of our cosmos might hide something big
Little red dots may reside in small, dense galaxies with total masses equivalent to around 1 billion times that of the sun, according to research published in Nature Astronomy.
Recent research published in Nature Astronomy suggests that the little red dots observed in distant galaxies may not be mere points of light, but rather are possibly nestled within compact star-forming galaxies. These mysterious objects, detectable only through their red hues at vast distances from Earth, have long puzzled scientists regarding their nature and the origin of their light.
By combining images from the James Webb Space Telescope of 217 such objects, researchers Xuheng Ding and Lilan Yang have uncovered faint optical emission, which is typically invisible in individual images. This faint glow, extending beyond the central objects, could potentially be attributed to star-forming galaxies, with the little red dots residing at their cores as supermassive black holes.
The galaxies in question are exceptionally compact, boasting an average radius of just 210 parsecs (approximately 685 light-years), making them about 2.5 times more condensed than comparable star-forming galaxies from the same era in the universe's history.
The findings imply that the little red dots are not isolated luminous points but rather are embedded within these compact star-forming galaxies, offering an explanation for their origin. However, the researchers caution that the extended optical emission is too faint to be detected around most individual objects, limiting the sample's scope. To confirm their findings, further spectroscopic analysis is required to verify the objects' distances and properties.
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