Visibility of galaxies

Details Visibility of galaxies Visibility of galaxies

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.263..573d&link_type=abstract

Nature, vol. 263, Oct. 14, 1976, p. 573-575.

Astronomy and Astrophysics

Astronomy

215

Background Radiation, Galaxies, Visibility, Astronomical Photometry, Brightness, Galactic Radiation, Luminous Intensity, Milky Way Galaxy, Night Sky

Scientific paper

Our count of galaxies could be seriously biased by selection effects, largely determined by the brightness of the night sky. If the earth were situated near the center of a giant elliptical galaxy, the optical astronomers would be blinded to much of the universe by the surface brightness of their parent galaxy. This blinding, however, is a clearly relative matter, and so the question arises to what extent we are blinded by our spiral Galaxy. On the basis of two sets of observations applying to spirals and ellipticals, respectively, it is argued that our knowledge of galaxies is heavily biased by the sky background and that the true population of extragalactic space may be very different from the one we can see.

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