A catalog of galaxies in Hercules from the Palomar Sky Survey and the Minnesota Automated Plate Scanner

Details A catalog of galaxies in Hercules from the Palomar Sky Survey and the Minnesota Automated Plate Scanner A catalog of galaxies in Hercules from the Palomar Sky Survey and the Minnesota Automated Plate Scanner

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..788d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, April 1987, p. 788-804. Research supported by the Alfred P. Sloan Foundation.

Astronomy and Astrophysics

Astronomy

27

Astronomical Catalogs, Astronomical Spectroscopy, Galactic Clusters, Sky Surveys (Astronomy), Astronomical Photometry, Luminosity, Stellar Color, Stellar Spectra

Scientific paper

The authors have studied the Hercules cluster as a test of the feasibility of generating catalogs of galaxies from the Palomar Sky Survey plates using the Minnesota Automated Plate Scanner. The area surveyed extends from A2151 north through the Hercules supercluster. The resulting catalog is 80% complete or better to at least mJ = 18. Photometry good to 0.23 mag rms is possible even in high-speed "isodensitometry" mode. J-F colors are good to 0.17 mag rms. Similar lists of galaxies can be generated automatically for any region of the northern sky. In this paper the authors describe the operation of the plate scanner. They discuss the algorithm which distinguishes stars from galaxies and they estimate its completeness and confusion as functions of magnitude. The authors describe the quality of the photometric calibration both for overall galaxy magnitudes and for surface-brightness thresholds. They present the luminosity function for different regions and discuss the distribution of colors and its relation to morphological types.

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