Document Detail

"Signal" search for intelligence in the galactic nucleus with the array of the Lowlands.
MedLine Citation:
PMID:  11540883     Owner:  NASA     Status:  MEDLINE    
In August, 1981, the Westerbork Synthesis Radio Telescope was used for 4 h to search for narrowband pulsing 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 our bandwidth, centered on the 21 cm neutral hydrogen line, would be recognizable if it had a repetition period between 40 sec and 1/2 h. The rms sensitivity to point sources was approximately 50 mJy/cycle, and the detection limit was 500 mJy/cycle. The limit degrades for pulse widths < 0.02s. No repetitive signals were found. For a swept, narrow-band radio beacon constrained to the Galactic Disk (beamwidth = 0.02 rad), our detection limit corresponds to a transmitter power of 10(11) MW at the Galactic Center.
G S Shostak; J Tarter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta astronautica     Volume:  12     ISSN:  0094-5765     ISO Abbreviation:  Acta Astronaut     Publication Date:  1985  
Date Detail:
Created Date:  1998-08-28     Completed Date:  1998-08-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9890631     Medline TA:  Acta Astronaut     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  369-72     Citation Subset:  S    
Kapteyn Astronomical Institute, Groningen, The Netherlands.
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MeSH Terms
Astronomy / instrumentation*
Exobiology / instrumentation*
Extraterrestrial Environment*
Radio Waves*
Spectrum Analysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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