Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..105b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 1, July 1, 1992, p. 105-109.
Astronomy and Astrophysics
Astronomy
9
Astronomical Spectroscopy, Narrowband, Project Seti, Emission Spectra, Globular Clusters, Radio Telescopes
Scientific paper
A search is reported for narrow spectral line emission from 176 targets (including 166 stars and seven globular clusers) at the hypothesized 'interstellar communications channel' frequency of 4.462336275 GHz (= pi times the neutral hydrogen line at 1.42 GHz) using the Parkes Radio telescope. The frequency was Doppler corrected for the solar barycenter, target barycenter, and cosmic microwave background (CMB) reference frames. If a 'Galactic club' of extraterrestrial civilizations exists, then the null results, down to a 3 sigma limit of 2 Jy (6 Jy in CMB frame), set an upper limit of 10 exp 8 yr on the lifetime of such civilizations.
Blair David Gerald
Norris Ray P.
Troup Euan R.
Twardy R.
Wellington Kelvin J.
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