pencil-beam survey

pencil-beam survey

A form of redshift survey where deep exposures of comparatively small fields are taken only at sparse intervals across the sky. This allows a compromise between sampling deep in the redshift direction with a wide sky coverage and an economical use of telescope time.
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The pencil-beam survey suggested that over a distance of 7 billion light-years, galaxies appear in clumps spaced about 420 million light-years apart (SN:5/5/90, p.
Preliminary, partial results from pencil-beam surveys in other directions show similar galaxy distributions.
The pencil-beam surveys probe deeper into the universe than any other survey of galaxy positions.