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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.
| The radio-far-infrared relation of interacting and non-interacting spiral galaxies. I - Observations and data collection
Data from 6.3-cm radio continuum, H I, and far-infrared (FIR)observations are presented for a sample of isolated pairs of spiralgalaxies, and for a comparison sample of noninteracting ones. H I dataare used to separate the FIR emission of the cold and warm dustcomponent, employing a modification of the model presented by Buat andDeharveng (1988). The FIR flux of the warm dust component is used toestimate the thermal radio emission for some galaxies. A comparisonbetween the calculated thermal 6.3-cm flux densities and those derivedfrom radio observations show good agreement. It is concluded that themodel for the separation of the cold and warm dust component can be usedfor a further examination of the radio-FIR correlation.
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