Red Dots in Space Turned Out to Be Growing Black Holes ⚡ экспресс
JWST observations have uncovered a large population of compact 'Little Red Dots' (LRDs) whose spectra defy standard astrophysical explanations. It turns out these spectra can be naturally explained by radiation from an accreting direct-collapse black hole (DCBH). Using radiation-hydrodynamic simulations, the evolution of a DCBH seed was traced inside a dense, compression-heated, collisionally ionized accretion flow. The model self-consistently accounts for the shielding that causes the observed Balmer absorption, and for the partial escape of ultraviolet and optical radiation alongside reprocessed infrared. Crucially, this structure is not a blackbody and needs no stellar contribution: the UV continuum arises entirely from reprocessed DCBH radiation, attenuated only by a pinch of dust with an extinction curve matching that of high-redshift galaxies.
The James Webb telescope peered into the early universe and saw a multitude of mysterious red dots. Their glow didn't resemble familiar galaxies or stars. The answer was unexpected: these are growing black holes, born without a stellar stage. A hydrogen cloud, skipping the infancy of a star, collapses straight into a cosmic monster. Such a newborn then greedily pulls in matter, heating it to a bright glow. Around the hole, a dense gas cocoon forms, which absorbs X-rays but is transparent to visible and infrared light. That's why for Webb the dots are red, while for X-ray telescopes they are almost invisible. Analysis showed that some of these black holes already had a mass of a million Suns in their infancy — comparable to the monsters at the centers of galaxies. This explains how supermassive black holes managed to accumulate billions of solar masses in just a few hundred million years after the Big Bang. In essence, Webb captured the moment of their turbulent infancy.
🎯 Supermassive black holes can grow so fast that their mass doubles in just 10 million years — by cosmic standards, that's an instant.
🎬 It's like the birth of the black hole Gargantua from Interstellar, but without a stellar collapse — right in the early universe.