The apparent luminosity function of galaxies to the twenty-first magnitude

Details The apparent luminosity function of galaxies to the twenty-first magnitude The apparent luminosity function of galaxies to the twenty-first magnitude

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1647b&link_type=abstract

Astronomical Journal, vol. 84, Nov. 1979, p. 1647-1657.

Physics

Optics

16

Astronomical Photometry, Electrophotometry, Galactic Radiation, Luminous Intensity, Stellar Magnitude, Astronomical Maps, Astronomical Photography, Cassegrain Optics, Instrument Errors

Scientific paper

Galaxy counts to limiting magnitudes B=17.7 to 21.0 in 13 selected areas in the north galactic polar cap are presented. The photographs were taken with a reducing camera at the Cassegrain focus of the 91-cm and 205-cm reflectors of McDonald Observatory. Both galaxy and star images were counted and recorded. On each plate a few stars and galaxies were marked as representative of the plate limit. Selected brighter galaxies and stars were measured photoelectrically to fix the zero points. The B magnitude limits of each plate for stars and galaxies are obtained by a combination of photoelectric and photographic photometry. The resulting apparent luminosity functions of galaxies and stars are compared with earlier data. Sources of error in the counts are discussed in detail.

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