Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7537r&link_type=abstract
HST Proposal ID #7537
Physics
Hst Proposal Id #7537 Agn/Quasars
Scientific paper
I have developed a new technique for doing accurate photometry of ``inconspicuous AGNs'' {those that have luminosities less than their host galaxies}, using a combination of groundbased CCD data and a single high- resolution HST image of each object. Traditional CCD photometric measurement techniques do not work very well for such objects, due to problems disentangling AGN and host galaxy light, particularly for the typical poor seeing data from small telescopes used for monitoring AGNs. The technique needs a ``reference host galaxy image'', essentially a high-resolution image of the host galaxy with the AGN contribution removed. I wish to use the HST archive images to derive such reference images for a sample of 2 to 3 dozen inconspicuous AGNs. A summer student and I have developed IRAF scripts to automate the photometric reduction process, and have demonstrated its use on a sample of 180 groundbased CCD images of NGC 1275, using an HST archive
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