Early Universe’s supermassive black holes grew in cocoons like butterflies

The release of high-definition infrared images by the James Webb Space Telescope sparked intrigue among astronomers when they discovered peculiar bright objects dubbed 'Little Red Dots.' These entities were too luminous to be ordinary galaxies and too red to merely be star clusters, leading experts to suspect they might harbor supermassive black holes of surprising mass. A new study published in the journal Nature offers insight into this enigma, proposing that these young supermassive black holes undergo a 'cocoon phase.' In this phase, they are enveloped by dense gas that fuels their growth, which could explain the observations made by the JWST. Initially, scientists speculated that these Little Red Dots were compact, distant galaxies. However, their characteristics raised immediate questions. Vadim Rusakov, an astronomer from the University of Manchester and the study's lead author, highlighted that the observed masses of these objects were implausibly high. 'They would need to produce stars at 100 percent efficiency, which is not supported by our current understanding,' Rusakov stated. Typically, galaxies can only manage star production at about 20 percent efficiency. Another hypothesis was that these entities represented supermassive black holes, yet this too conflicted with established data. For many years, a consistent pattern has been observed linking galaxies to their central black holes: the black hole usually constitutes about 0.1 percent of the galaxy's total mass. This relationship suggests a synchronized growth process, but the Little Red Dots seem to defy this cosmic norm.