Infrared and CCD photometric study of spiral galaxies

Mathematics – Logic

Scientific paper

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Brightness, Charge Coupled Devices, Galactic Radiation, Infrared Photometry, Spiral Galaxies, Galactic Evolution, Image Processing, Mass To Light Ratios, Morphology

Scientific paper

Infrared J(1.2 microns), H(1.6 microns) and K (2.2 microns) photometry is presented for a subsample of galaxies with morphological types of Sc and Sb of the sample types Sc and Sb of the sample by Rubin et al. and one edge-on spiral galaxy. After an overview of the science of infrared photometry accurate photometric magnitudes are derived via curves of growth which have been computed using a compiled catalog of galaxies observed in the infrared. The photometric data is used to derive mass to light ratio distribution and the colors for each galaxy. Several correlations of photometric and dynamical quantities are examined and discussed as integral properties of the two morphological types. The main result of this analysis is that the mass to H-light ratio is independent of radius and H-luminosity and is a good measure of the stellar component of the galaxy. Emphasis is placed on the Tully-Fisher, absolute magnitude vs. log (rotational velocity), relation and its application to derive distances of galaxies.

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