Chick in a Dusty Cocoon: What the Red Quasar Was Hiding ✛ ✎

Original: "A quasar hatching from a buried red phase at z = 3.7"
arXiv:2607.22966v1 · 2026-07-25 · arXiv non-exclusive · independent analysis · 1 min
Astronomers have seen a quasar's core punching through a cloud of dust and gas: X-rays already shine inside, but a dense veil still hangs outside.

Looking at a reddish dot in data from the JWST telescope, astronomers realized it was no ordinary distant galaxy. The light traveled 12 billion years to reach us — from an era when the universe was young. Inside that dot hides a chick. Its "shell" is a dense cloud of dust and gas concealing a growing quasar core. But the shell is already cracked: X-ray glow and fast-gas emission lines are visible at the center, while a curtain of cold hydrogen and helium still billows outside, obscuring part of the picture.

The dust around the core has cooled to just −238 °C, yet it re-emits energy so powerfully that it shines in infrared like three trillion suns.

Why does this matter? Usually we see either a fully exposed quasar or one hidden by dust. The Chick shows the moment when the core's radiation has begun to push gas away and break apart the envelope. Outflow speeds reach 2000 km/s: that's 6 times faster than lightning. This feedback (active galactic nucleus feedback) will eventually clear all the dust, and the quasar will become bright and blue. That means red quasars are not a separate class but just a stage of maturation.

The Chick got its name because its spectrum resembles a hatching chick — its bright nucleus is already breaking through a shell of dust and gas. Amusingly, neighboring galaxies at distances of 12 and 66 thousand light-years may be 'members of the same nest' — possibly a protocluster at z=3.7.

Scientists
Bernhard RiemannJoseph WeberKarl SchwarzschildKip ThorneRainer WeissAlbert Einstein
Concepts
obscured quasar quasar jwst red sources red dot galaxies obscured agn torus blazar crab nebula interstellar gas reddening quiescent galaxy young stellar object gas cloud seyfert galaxy halo helium burning h alpha stellar nursery helium flash red galactic nuclei