Restrictions on extragalactic transmitters by hack listening

press release

Astro Ph

September 19, 2022

Transfer rate chart versus EIRPmin for a set of SETI studies. The gray line is determined by the two most constrained values ​​- this work (results of NGC 7714 / NGC 7715 and the 3C402 galaxy cluster and the nearby AGN WISEA cluster J080816.59 + 210857.0) and Wlodarczyk-Sroka et al. (2020) – This data expands the parameter space into a new region with smaller transmission rates and larger EIRPmin. If extraterrestrial transmitters follow an energy law distribution, the area below this line represents the “uncharted territory” of SETI surveys. Error bars for this work (red symbols) are presented at the 2-sigma level for clarity.

Astro Ph

The Breakthrough Listen Initiative has embarked on a comprehensive SETI survey of nearby stars in the Milky Way that vastly outperforms previous efforts measured by a wide range of different scales.

SETI surveys traditionally ignore the fact that they are sensitive to many background objects, as well as the front target star. In order to better estimate and exploit the presence of extragalactic objects in the field of view, the Aladdin Atlas of the Sky and NED were used to perform a preliminary count of the extragalactic objects observed by chance with the 100-meter Greenbank telescope observing at 1.1-1.9 GHz. For 469 target fields (assuming a radial field of view FWHM of 4.2 arc minutes), the NED identified a total of 143,024 extragalactic objects, including various exotic astrophysics such as AGNs of various types, radio galaxies, interacting galaxies, and a single gravitational-confirming lens system.

Several neighboring galaxies, galaxy clusters, and galaxy clusters have been identified, allowing the parameter space explored by SETI surveys to be extended significantly. Limits on the luminescence function of extraterrestrial potential transmitters are placed assuming that they follow a simple energy law, and the propagation limits of very strong extraterrestrial transmitters associated with these broad star systems have been determined. The recent Breakthrough Listen initiative, and several previous SETI radio surveys, have been shown to place stronger constraints on the spread of extraterrestrial intelligence in the distant universe than is often fully appreciated.

MA Garrett, ABV Simeon

Comments: 9 pages, 5 numbers, accepted by MNRAS
Topics: High Energy Astrophysical Phenomena (Astro Ph HE); Earth and Planetary Astrophysics (astro-ph.EP); Galactic astrophysics (astro-ph.GA); Popular Physics (physics.pop-ph)
Cited as follows: arXiv: 2209.08147 [astro-ph.HE] (or arXiv: 2209.08147v1 [astro-ph.HE] for this version)
Submission date
WHO: Andrew Simeon
[v1] Friday, September 16, 2022 19:36:07 UTC (8,847 KB)

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