Zodiacal light and the apparent magnitudes of galaxies

Details Zodiacal light and the apparent magnitudes of galaxies Zodiacal light and the apparent magnitudes of galaxies

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978afz....14..315f&link_type=abstract

(Astrofizika, vol. 14, May 1978, p. 315-323.) Astrophysics, vol. 14, no. 2, Dec. 1978, p. 180-185. Translation.

Astronomy and Astrophysics

Astrophysics

2

Brightness, Galaxies, Magnitude, Zodiacal Light, Astronomical Catalogs, Ecliptic, Error Analysis

Scientific paper

It is demonstrated that the mean brightness of galaxy images is somewhat lower than the brightness of the zodiacal light and that the effect of the zodiacal light on the measured angular diameters and apparent magnitudes of galaxies should be large. The effect of the zodiacal light on the apparent magnitudes of faint galaxies (apparent magnitude no brighter than about 15.3) in the Zwicky et al. (1961-1968) Catalog of Galaxies and Clusters of Galaxies is investigated. Indications of error in the catalog data are discussed. It is shown that the mean number density of galaxies in different regions of sky is related to the reduced brightness of the zodiacal light, such that the exact limiting magnitude of galaxies that are still distinguishable may be smaller by 0.3 to 0.6 mag near the ecliptic than far from it, while the apparent magnitudes of brighter galaxies near the ecliptic are underestimated due to zodiacal light that has not been taken into account. Mean values of corrections to the apparent magnitudes of objects in the catalog of Zwicky et al. are given for apparent magnitudes in the range from 15.3 to 15.7.

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