I introduce a straightforward technique for the filtering of extended astronomical images into components of different spatial scales. For a positive original image, each component is positive definite, and the sum of all components equals the original image. In this way, the components are each individually suitable for flux measurements and broadband spectra calculations. I present an illustration of this technique on the radio galaxy Cygnus A.
Bibliographical noteFunding Information:
This work is supported by NSF grant AST 96-16964 and AST AST 96-19438 at the University of Minnesota. I am grateful to John Dickey, Andrew Young, Barron Koralesky and Deb Katz-Stone for many useful ideas and feedback.
- Galaxies: Active
- Galaxies: Individual (Cygnus A)
- Radiation mechanisms: Non-thermal
- Radio continuum: Galaxies
- Techniques: Image processing