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Reanalysis Sharpens 1977 'Wow!' Signal: Stronger, Higher-Frequency, Tighter Origin

The Arecibo Wow! team used digitized Big Ear records to argue for a natural astrophysical origin over terrestrial interference.

Overview

  • New arXiv preprints from the AWOW project report a peak flux density near 250 Janskys, roughly four times many prior estimates.
  • The signal’s frequency is revised to 1420.726 MHz, a shift near the hydrogen line that implies faster source motion within the Milky Way.
  • Researchers narrowed the sky region of origin with about a two-thirds gain in location certainty, providing refined coordinates for follow-up.
  • The team rules out known man-made transmitters, satellites, moon-bounce, and simple instrument or software errors as likely causes.
  • The work, submitted to The Astrophysical Journal, builds on OCR of more than 75,000 preserved Big Ear pages and advances a cold hydrogen cloud brightening—potentially magnetar-triggered—as a leading natural explanation.