A two-color CCD survey of the North Celestial Cap: I. The method |
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| Authors: | Evgeny Gorbikov Noah Brosch Cristina Afonso |
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| Institution: | 1.The Wise Observatory and the Raymond and Beverly Sackler School of Physics and Astronomy, The Faculty of Exact Sciences,Tel Aviv University,Tel Aviv,Israel;2.Max Planck Institute for Astronomy,Heidelberg,Germany |
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| Abstract: | We describe technical aspects of an astrometric and photometric survey of the North Celestial Cap (NCC), from the Pole (δ=90°) to δ=80°, in support of the TAUVEX mission. This region, at galactic latitudes from ∼17° to ∼37°, has poor coverage in modern
CCD-based surveys. The observations are performed with the Wise Observatory one-meter reflector and with a new mosaic CCD
camera (LAIWO) that images in the Johnson–Cousins R and I bands a one-square-degree field with sub-arcsec pixels. The images are treated using IRAF and SExtractor to produce a final
catalogue of sources. The astrometry, based on the USNO-A2.0 catalogue, is good to ∼1 arcsec and the photometry is good to
∼0.1 mag for point sources brighter than R=20.0 or I=19.1 mag. The limiting magnitudes of the survey, defined at photometric errors smaller than 0.15 mag, are 20.6 mag (R) and 19.6 (I). We separate stars from non-stellar objects based on the object shapes in the R and I bands, attempting to reproduce the SDSS star/galaxy dichotomy. The completeness test indicates that the catalogue is complete
to the limiting magnitudes. |
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