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the main science goals of the OACDF are:
i) push at fainter magnitude limits the studies of the large scale structures, which are already in progress in the framework of the CRONARIO project;
ii) study detailed properties of a few clusters at intermediate and high redshift, as well as their relation with the surrounding structures;
iii) study in detail the properties of galaxies for z~0.5. In particular, by comparing the properties (colors, luminosity functions, morphological types, interacting fraction, velocity dispersions) of galaxies in clusters and in the field, the problem of the morphology-environment correlation will be addressed;
iv) enlarge the statistics on high-z U-drop outs. With our limits in U=25.3 this corresponds to UAB ~ 26.0 at S/N=5, and therefore at UAB ~ 26.5 at S/N=3 for limits to U detections. This, together with our R=25.5 (RAB ~ 25.7) yields adequate U limit+color leverage;
v) to identify QSO candidates at high redshift, which will be identified through multi-color selection and also subsequent radio and X-ray followups;
vi) the multi-color identification of Seyfert-1, Seyfert-2 and Starburst galaxies in the following redshift range - Seyfert-1 galaxies up to z=2.3 and Seyfert-2 and starburst galaxies up to z=1.5 - to determine their luminosity functions, with implications for a possible link between the two classes of objects.
vii) find low metallicity stars (at high z above the galactic disk), white dwarfs (WDs) and very low mass stars (VLMS) and brown dwarf (BD) candidates. Both, the WD and VLM/BD stars, are a possible dark matter constituent for our halo;
viii) Variability studies and detection Kuiper Belt objects (KBOs) at high orbital inclinations.