How to remove bandwidth-smeared interfering sources
Talk for the JIVE / ASTRON astro lunch on 22 Mar 2006
O. Wucknitz [1]
- Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, Netherlands
Abstract
I discuss the problem of bandwidth smearing on the example of a VLA observation of the galaxy cluster Cl0024+1654. If the bandpass functions are equal for all telescopes, mapping and subtracting the smeared sources works relatively well. If we furthermore know the bandpass, we can apply the method of double deconvolution to reconstruct the source structure. In real arrays, however, the bandpasses of individual telescopes can differ significantly so that bandpass averaging is no longer equivalent to a radial convolution. I show how in such a case it is possible to fit for the bandpasses of all telescopes and subtract interfering sources very accurately. Application of this method to the Cl0024+1654 data improves the quality of the maps significantly.
download Original presentation
PDF file (2.6 MB, last change 22 Mar 2006)
31 pages, suitable for presentation with acroread. This version also includes some hyperlinks for quick navigation and links to references.
download printable version
gzipped postscript file (3.4 MB, last change 22 Mar 2006)
unzipped postscript file (7.8 MB)
Paper saving version. 4 pages, text in b/w, colour figures. 8 slides per A4 page.
To publications
To my homepage
To the AIfA
To the University of Bonn
Script last modified on 7 Sep 2010
Last change to this data base entry on 22 Mar 2006