Virgo Cluster Archives - Astrobiology

Current and forthcoming constraints on radio line broadcasts in M31 (left) and three example Virgo cluster ellipticals (right), assuming that all broadcasts in each galaxy have the same EIRP ℓ. The G17 observations of M31 exclude the red shaded region, while example future observations with FAST and GBT are in blue and green, respectively. Solid shading applies to individualist constraints when δM = 0, and hatched shading is for the noise confusion limit at high δM (vertical for M49, diagonal for M31 and M87, horizontal for M59). -- astro-ph.GA

Astronomy & Telescopes, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report

Artificial Broadcasts as Galactic Populations: II. Comparing Individualist and Collective Bounds on Broadcast Populations in Single Galaxies

by Keith CowingOctober 8, 2025October 8, 2025

The search for extraterrestrial intelligence includes efforts to constrain populations of artificial broadcasts in other galaxies.