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Population Statistics of Faint Stellar and Non-Stellar Objects

Published online by Cambridge University Press:  15 February 2018

Sidney van den Bergh
Sidney van den Bergh*
Affiliation:
Dominion Astrophysical Observatory Herzberg Institute of Astrophysics National Research Council Canada Victoria, B.C.

Abstract

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  1. 1. A disc and halo population model is constructed to fit star counts and color data down to V ~ 23 at |b| = 90°. This model is used to predict star counts and colors down to V ~ 30. Deviations from these extrapolated relationships might provide constraints on the number of faint quasars and ”black dwarf” stars.

  2. 2. The model shows that extra-galactic globular clusters start contributing significantly to ”star” counts at V ~ 25 and are more numerous than stars for V > 31.

  3. 3. Morphological studies of galaxies with z ~ 0.5, which are feasible with the Space Telescope, could provide significant constraints on theoretical models that describe the evolution of clusters of galaxies.

  4. 4. It is argued that the Space Telescope reduces the need for super-expensive earth-bound telescopes of heroic dimensions.Ground-based observations should, instead, exploit the advantage of low-cost photons that could be collected by mass produced ~3m thin mirror ”people's telescopes”.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 54: Scientific Research with the Space Telescope , 1979 , pp. 151 - 164
Copyright
Copyright © Marshall Space Flight Center 1979

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