Webb Found Giants That Turned Darkness into Light ⚡ экспресс
Ultra-deep (20–30 h) ultraviolet spectra of two galaxies at z≈8.7 (CEERS-1019 and CEERS-1025, Z_neb≈0.1 Z_⊙), obtained with NIRSpec/JWST, show strong P-Cygni profiles in stellar wind lines (NV λ1240, CIV λ1550) and broad HeII λ1640 emission (EW≈2–4 Å). Stellar population models with metallicity Z_★≈0.1 Z_⊙ that include very massive stars (VMS) reproduce these features significantly better than standard ones (ΔAIC, ΔBIC>70). The interpretation is supported by empirical spectra of local systems dominated by VMS. The best-fit models yield a population age of ~1.5–2.0 Myr and an ionizing photon production efficiency of log ξ_ion≳25.8 Hz erg⁻¹, which is ~0.1–0.2 dex higher than estimates without VMS. The results point to an overabundance of VMS at high redshifts with an initial mass function extending beyond 100 M_⊙, and underscore their role in shaping the UV spectra, chemical enrichment, and ionizing radiation of early galaxies.
The light from two galaxies, caught by the James Webb telescope, traveled 13 billion years to us, beginning just 600 million years after the Big Bang. Breaking this light into colors (spectral analysis), astronomers saw not just distant galaxies but true lighthouses: within them blazed giant stars.
It turned out that stellar heavyweights, 200–300 times the mass of the Sun, raged there. Their ferocious winds and fierce ultraviolet light left clear fingerprints in the emitted helium and other elements. Like colossal searchlights, they pierced through the surrounding cold hydrogen, clearing their path and making the universe transparent. Without these giants, the expanding cosmos would have remained a murky hydrogen broth, never giving rise to smaller stars or planets.
The irony is that they lived only a moment—about one and a half million years, shorter than the blink of a cosmic eye. Yet it was this ultra-bright flare that ignited light in the previously impenetrable darkness and forever changed the face of the universe.
🎯 Today's record-holder R136a1 is 265 times heavier than the Sun, but the young universe churned out such stars by the hundreds—they were commonplace.