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\section{References and articles to read}  PDF \href{http://cxc.cfa.harvard.edu/ChandraDecade/PDFs/Elvis_3.pdf}{PDF  of Chandra COSMOS Survey Survey}  -- http://cxc.cfa.harvard.edu/ChandraDecade/PDFs/Elvis_3.pdf COSMOS \href{http://cosmos.astro.caltech.edu/page/datasets ;  http://irsa.ipac.caltech.edu/data/COSMOS/datasets.html}{COSMOS  public data & archives archives}  -- http://cosmos.astro.caltech.edu/page/datasets ; http://irsa.ipac.caltech.edu/data/COSMOS/datasets.html