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Horowitz P. A search for ultra-narrowband signals of extraterrestrial origin. Science. 1978;201(4357):733-5doi: 10.1126/science.201.4357.733.
Horowitz, P. (1978). A search for ultra-narrowband signals of extraterrestrial origin. Science (New York, N.Y.), 201(4357), 733-5. https://doi.org/10.1126/science.201.4357.733
Horowitz, P. "A search for ultra-narrowband signals of extraterrestrial origin." Science (New York, N.Y.) vol. 201,4357 (1978): 733-5. doi: https://doi.org/10.1126/science.201.4357.733
Horowitz P. A search for ultra-narrowband signals of extraterrestrial origin. Science. 1978 Aug 25;201(4357):733-5. doi: 10.1126/science.201.4357.733. PMID: 17750231.
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Science. 1978 Aug 25;201(4357):733-5. doi: 10.1126/science.201.4357.733.

A search for ultra-narrowband signals of extraterrestrial origin.

Science (New York, N.Y.)

P Horowitz

PMID: 17750231 DOI: 10.1126/science.201.4357.733

Abstract

Nearly 200 nearby stars similar to the sun were observed at the 21-centimeter neutral hydrogen wavelength (in the heliocentric frame) with a bandwidth of 1 kilohertz and a resolution of 0.015 hertz, using the Arecibo 305-meter antenna. At this resolution the effects of terrestrial interference are so slight that the detection limit of 4 x 10(-27) watt per square meter was set by receiver noise alone. No evidence of artificial signals was found.

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