'SIGNAL' - Search for Intelligence in the Galactic Nucleus with the Array of the Lowlands

Astronomy and Astrophysics – Astronomy

Scientific paper

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Extraterrestrial Intelligence, Galactic Nuclei, Milky Way Galaxy, Radio Astronomy, Centimeter Waves, Cross Correlation, Data Reduction, Hydrogen, Radio Beacons, Radio Telescopes

Scientific paper

In August, 1981, the Westerbork Synthesis Radio Telescope was used for 4 hours to search for narrow-band radio beacons in the direction of the Galactic Center. By using both the spatial discrimination and temporal stability available to an interferometric measurement, weak intermittent signals can be detected even in the face of the strong, naturally-caused radiation from this region. A radio beacon within the bandwidth used here, centered on the 21-cm neutral hydrogen line, would be recognizable if it had a repetition period between 40 sec and several hours. The rms sensitivity to point sources is approximately 20 mJy, or many orders of magnitude better than typical sensitivities achieved by scanning single-dish instruments.

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