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4.5 External Comparison of Photometry

We also compared our photometry with other studies in the literature. In this way we get an estimate of the total uncertainty, including systematic differences that could arise from e.g. the standard calibration. As for the internal comparison of the photometry, we both compare aperture magnitudes and entire surface brightness profiles. The main point of the comparison of aperture magnitudes is to test the zero point in the calibration to the standard system.


Properties of E and S0 Galaxies in the Clusters HydraI and Coma
Master's Thesis, University of Copenhagen, July 1997

Bo Milvang-Jensen (