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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 4(451), p. 4238-4252

DOI: 10.1093/mnras/stv1130

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The VLT Survey Telescope ATLAS

Journal article published in 2015 by T. Shanks, N. Metcalfe ORCID, B. Chehade, J. R. Findlay, M. J. Irwin, E. Gonzalez-Solares, J. R. Lewis, A. Kupcu Yoldas, R. G. Mann, M. A. Read, E. T. W. Sutorius, S. Voutsinas
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The VLT Survey Telescope (VST) ATLAS is an optical ugriz survey aiming to cover ~4700deg^2 of the Southern sky to similar depths as the Sloan Digital Sky Survey (SDSS). From reduced images and object catalogues provided by the Cambridge Astronomical Surveys Unit we first find that the median seeing ranges from 0.8 arcsec FWHM in i to 1.0 arcsec in u, significantly better than the 1.2-1.5 arcsec seeing for SDSS. The 5 sigma magnitude limit for stellar sources is r_AB=22.7 and in all bands these limits are at least as faint as SDSS. SDSS and ATLAS are more equivalent for galaxy photometry except in the z band where ATLAS has significantly higher throughput. We have improved the original ESO magnitude zeropoints by comparing m