SETI - A preliminary search for narrowband signals at microwave frequencies

Details SETI - A preliminary search for narrowband signals at microwave frequencies SETI - A preliminary search for narrowband signals at microwave frequencies

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cosp.meetq....c&link_type=abstract

COSPAR, Plenary Meeting, 20th, Tel Aviv, Israel, June 7-18, 1977, Paper. 4 p.

Astronomy and Astrophysics

Astronomy

Extraterrestrial Communication, Extraterrestrial Life, Hydroxyl Emission, Microwave Frequencies, Radio Communication, Microwave Transmission, Nonthermal Radiation, Radio Frequency Interference, Radio Sources (Astronomy), Spectral Line Width, Spectrum Analysis

Scientific paper

In the search for intelligent signals of extraterrestrial origin, certain forms of signals merit immediate and special attention. Extremely narrowband signals of spectral width similar to our own television transmissions are most favored energetically and least likely to be confused with natural celestial emission. A search of selected stars has been initiated using observational and data processing techniques optimized for the detection of such signals. These techniques allow simultaneous observation of 10 to the 5th to 10 to the 6th channels within the observed spectral range. About two hundred nearby (within 80 LY) solar type stars have been observed at frequencies near the main microwave transitions of the hydroxyl radical. In addition, several molecular (hydroxyl) masers and other non-thermal sources have been observed in this way in order to uncover any possible fine spectral structure of natural origin and to investigate the potential of such an instrument for radioastronomy.

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