Optimum signal to noise ratios for observations of faint galaxies

Details Optimum signal to noise ratios for observations of faint galaxies Optimum signal to noise ratios for observations of faint galaxies

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..371p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 371, 372.

Astronomy and Astrophysics

Astronomy

5

Astronomy, Galaxies, Signal To Noise Ratios, Apertures, Elliptical Galaxies, Hubble Space Telescope, Observation, Spiral Galaxies

Scientific paper

The aperture size necessary to optimise the signal to noise ratio for observations of faint galaxies is calculated in terms of the galaxies' scale sizes. Angular sizes are calculated for characteristic cases. It is found that the optimum is attainable from the ground for faint spirals, but that the Space Telescope should be able to observe ellipticals more than a magnitude fainter than an identical ground based system.

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