Other
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acaau..61...78h&link_type=abstract
Acta Astronautica, Volume 61, Issue 1-6, p. 78-87.
Other
1
Scientific paper
We report initial results from the Harvard/Planetary Society all-sky search for pulsed optical signals from other civilizations, which saw “first light” on 11 April 2006 after 6 years of planning and construction. To survey the northern sky (-20<δ<+70), our 1.8-m spherical f/2.5 optical telescope images a 1.6×0.2 patch of sky on two matched focal planes with a total of 1024 photomultiplier tube pixels. Each pair of pixels images the same 2.3 square arcminute patch of sky, and fast electronics filters the incoming visual band light for nanosecond pulses. Coincident optical flashes in a pair of pixels triggers one of 32 PulseNet full-custom chips to record the pulse profiles at nanosecond resolution. This experiment is an all-sky, kilopixel evolution of our targeted search. Its meridian transit survey mode requires ˜150 clear nights to cover the northern sky with 1-min dwell time per source point. Focus in this talk will be given to describing the capabilities of the all-sky search instrument, the first few months observations, and constraints that these observations place on the density of pulsed optical signals in the galaxy.
Coldwell Charles
Gallicchio Jason
Horowitz Paul
Howard Andrew
Howard Steve
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