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|An image database. II. Catalogue between δ=-30deg and δ=70deg.|
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.
|Neutral hydrogen observations of galaxies in the Hercules supercluster. III. CGCG fields at the edge of the void.|
The third installment of a HI redshift survey in the region of theHercules supercluster is presented. This part of the survey presents HIspectra of 84 galaxies selected from the UGC and CGCG which extends thepreviously begun survey of late-type spiral galaxies in that region.Measured HI parameters from the spectra are given. For about 20% of thesample, these parameters are compared to those measured previously byother workers.
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