Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e...3g&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
For many critical applications it is necessary to understand the limitations of the large-scale surveys in terms of photometric systematics and source confusion. The photometric surveys of the present and past employ a variety of different filter systems, even if nominally standard. Very often the fiducial colours of stars in a given survey are based on modelling from theoretical atmospheres or spectrophotometry rather than on observational data made with the same set of filters. The output of a particular detector is dependent, inter alia, on a precise knowledge of the transmission characteristics of the filters and the atmosphere. The filter manufacturing process itself is limited in precision. Measurements of transmission as a function of wavelength may not be available for the temperature at which a filter is used. For objects with smooth spectra and not suffering severe interstellar reddening, colour transformations are usually very successful. However, in studies of extincted regions, such as along the Galactic Plane, the calculation of reddening amounts can be heavily dependent on filter characteristics, not just their "effective wavelengths". Confusion will of course become significant according to source densities and pixel sizes. In heavily extincted areas, there is a danger of identifying nearby faint sources with distant ones observed at longer wavelengths where the extinction is less.
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