Galaxy Number Counts in 1000 sq.deg. of the Digital Palomar Observatory Sky Survey (DPOSS)

Details Galaxy Number Counts in 1000 sq.deg. of the Digital Palomar Observatory Sky Survey (DPOSS) Galaxy Number Counts in 1000 sq.deg. of the Digital Palomar Observatory Sky Survey (DPOSS)

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.0413o&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #04.13; Bulletin of the American Astronomical Society, Vol. 31, p.828

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We present a JFN survey of selected high-latitude fields covering 1000 sq. degrees of the digitized Second Palomar Observatory Sky Survey (DPOSS) containing on the order of 1 million galaxies. Innovative automated image classification techniques employing artificial neural network and decision tree pattern classifiers are used to establish catalogs of stars and galaxies. These classifiers have been established using training data drawn from over 550 Gunn gri CCD fields observed with the Palomar 60-inch. We quantify the success of these classifiers and the systematics of our photometry as a function of apparent magnitude using both plate-overlap and CCD field comparisons. A variety of global photometric properties and Fourier image models are extracted from the JFN galaxy images having diameters measured at the 25 mag\ arcsec(-2) isophote larger than 30'' and/or gJ <= 18. A multi-dimensional analysis of these quantities is performed using artificial neural networks to develop a viable galaxy morphology classifier for the DPOSS material. We present a new morphological classification approach using Fourier image models to identify barred and ringed spiral systems. The DPOSS multi-color photometric catalog is used to compute galaxy number counts in 3 bands (photographic JFN calibrated to Gunn gri) and are compared to a large collection of published number count studies. These data will be compared to predictions from non-evolving and evolving galaxy models and serve as a fiducial measure of galaxy number counts at intermediate flux levels. The results are discussed in the context of related studies of the high redshift Universe made with the Keck telescopes and HST.

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