Over a Quarter Million Galaxies at the North Galactic Pole

J. E. Cabanela and R. M. Humphreys (U. Minnesota)

Summer 1998 AAS Meeting (San Diego, CA)
June 11, 1998

Abstract We have constructed a two-color catalog of galaxies found on the APS digitized scans of the POSS-I within 30 degrees of the North Galactic Pole (NGP). This is a complete sample of over 250,000 galaxies with major-axis diameters greater than 10". Evidence is presented to show that the major-axis diameters retrieved from the Minnesota Automated Plate Scanner (APS) are roughly isophotal down to an isophote of 23 magnitudes per square arcsecond. This machine built catalog is the largest catalog of galaxies with roughly isophotal diameters and provides an excellent sample for investigating the diameter function of galaxies. This survey in concert with other surveys in other bandpasses will provide critical information about the large-scale structure visible at the NGP.

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Introduction: The APS North Galactic Pole Survey

• Figure 1: The APS North Galactic Pole Survey
• Figure 2: The APS North Galactic Pole Survey POSS I Fields

Motivation for the Survey: APS Diameters

• Figure 3: The Diameter-Inclination Effect
• Figure 4: APS Ellipticity Distribution

An Investigation of Internal Extinction in Other Galaxies

• Figure 5: log(diameter) vs. magnitude plot

New Results using the APS diameters

• Figure 6: Inclination Effects on Magnitude-Limited Sample
• Figure 7: Inclination Effects on Diameter-Limited Sample
  

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