| "Signal" search for intelligence in the galactic nucleus with the array of the Lowlands. | |
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MedLine Citation:
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PMID: 11540883 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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G S Shostak; J Tarter |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Acta astronautica Volume: 12 ISSN: 0094-5765 ISO Abbreviation: Acta Astronaut Publication Date: 1985 |
Date Detail:
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Created Date: 1998-08-28 Completed Date: 1998-08-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9890631 Medline TA: Acta Astronaut Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 369-72 Citation Subset: S |
Affiliation:
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Kapteyn Astronomical Institute, Groningen, The Netherlands. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Astronomy
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instrumentation* Communication* Exobiology / instrumentation* Extraterrestrial Environment* Netherlands Radio Waves* Spectrum Analysis |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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