A catalog of low-surface-brightness objects - Declination zone + 20 deg

Astronomy and Astrophysics – Astronomy

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Brightness, Celestial Bodies, Galactic Structure, Red Shift, Spatial Distribution, Charge Coupled Devices, Infrared Astronomy Satellite, Line Spectra, Signal To Noise Ratios

Scientific paper

Plates from the second Palomar Sky Survey are used to compile a list of low-surface-brightness objects located along declination zone + 20 deg. Coordinates, descriptions, sizes, and ellipticities are presented using the same selection criteria of 1 arcmin limiting diameter as the Uppsala Catalog of Galaxies (Nilson 1973). Lists of previously known galaxies with new low-surface-brightness features and interesting low-surface-brightness objects with diameters between 0.5 and 1 arcmin are also presented. As expected, the low-surface-brightness end of the luminosity function is dominated by late-type systems and dwarfs. Comparison with CCD surface photometry indicates an average limiting surface brightness of 26.0 B mag/sq arcsec for this survey as compared to 25.2 B mag/sq arcsec for the UGC. On the whole, too few new low-surface-brightness galaxies have been found for the space density of these objects to be higher than that defined by conventional disk galaxies.

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