Host galaxy subtraction in differential aperture photometry

Details Host galaxy subtraction in differential aperture photometry Host galaxy subtraction in differential aperture photometry

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006enig.confe...5n&link_type=abstract

Proceedings of the 8th ENIGMA meeting, held in Espoo, Finland, September 6-8, 2006, Eds: T.Hovatta, E.Nieppola and I.Torniainen,

Computer Science

Scientific paper

Due to its simplicity and reliability, differential aperture photometry is widely employed to measure fluxes of variable sources, including blazars. However, the presence of a strong host galaxy component can make it difficult to compare measurements made by different observers, if e.g. different aperture radii have been used. We have studied the effect of aperture radius and seeing on 16 BL Lacertae objects currently monitored at Tuorla Observatory. We use simulated object fields for this purpose and take also into account any nearby stars and galaxies that might contribute light into the measurement aperture. Using this method we can correct measurements made with different aperture radii into the same aperture with an accuracy of ~5-7% in the case of Tuorla monitoring data.

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