Samples of Normal and LSB Field Galaxies from the KISS Database

Statistics – Applications

Scientific paper

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Scientific paper

The KPNO International Spectroscopic Survey (KISS) has amassed a database of CCD images covering, to date, nearly 200 deg(2) of the northern sky. The primary goal is to compile a large, complete sample of emission line galaxies, but this dataset has many other applications. We discuss the construction of a bright field galaxy catalog, and a preliminary study of the low surface brightness detection limit of the images. The KISS digital field galaxy catalog contains B and V CCD photometry complete to a depth of 19.5 in B for over 70,000 galaxies within an area of 77.5 deg(2) . We briefly discuss the construction and verification of the catalog, and then present the number counts and color distribution for the sample. We find a higher normalization of the counts and a shallower bright end slope compared to previous studies, consistent with mild luminosity evolution. In addition to being apparent magnitude-limited, the field galaxy catalog is surface brightness-limited. We have initiated an investigation of this limit in order to estimate its effect on the number counts, and to assess the possibility of extracting a catalog of LSB galaxies from the KISS images. Such a list would be of general interest, since these galaxies are difficult to detect and are therefore under-represented in most catalogs. We have visually selected a sample of about 70 candidate objects and have obtained deep U and R images for eight of these. Six of the eight candidates were detected with the WIYN Imager, and surface photometry in U and R is presented. Implications of these results for the number counts and the proposed LSB catalog are discussed. KEK acknowledges support for this report from the U. Wisconsin Graduate School.

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