Looking for fine structures in galaxies^*

CNPq/Laboratório Nacional de Astrofísica, Caixa Postal 21, CEP: 37.500-000, Itajubá, MG, Brazil

Received: 11 April 1997
Accepted: 21 July 1997

Abstract

In order to enhance fine structure in direct CCD images of galaxies, transform processing has been employed: working in the transform domain, transform functions have been created and simple high-  and low-pass filters have been applied to the images during the process. The results presented herein refer to a test sample of four galaxies:  ESO 143-G7,  HRG 54103, NGC 5193/5193A, and  NGC 5761. It is also discussed the use of a Fourier-hologram image as a transfer function.