Other
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..48...10d&link_type=abstract
The Messenger, vol. 48, p. 10-13
Other
9
Ccd Observations:Radio Galaxies, Radio Galaxies:Ccd Observations
Scientific paper
The study of line emitting objects often requires to image separately the line emission from the continuum one, in order to discriminate the different physical components. This is generally not possible with the broad bands of the standard photometric systems, like UBVRI. Rather one should use narrower bands selected according to the wavelengths of the emission lines. I discuss here the techniques to obtain pure and calibrated line and continuum images. "Pure" means that the line image is free from the contribution of the continuum and vice versa.. Since narrowband imaging is not a new teehnique, I will restriet myself to the considerable improvements recently offered by the availability of linear and calibratable detectors, of interferenee filter sets and of powerful and versatile image reduction systems. Although I will concentrate here on images of active galaxies obtained with the ESO telescopes and GGD cameras at La Silla and reduced using MIDAS, the following discussion can be applied with small modifications to any class of line emilting objects and to other sites, detectors and reduction systems. I will first give some hints on how to conduct the observations and then discuss the reduction procedure. A technical note containing more detailed information is available from the author for those interested in actually using these techniques.
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