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Sources:
http://hubblesite.org/newscenter/archive/releases/2007/03/image/a/
http://www.aanda.org/articles/aa/pdf/2012/04/aa19126-12.pdf
http://iopscience.iop.org/1538-3881/121/2/1111/pdf/200337.web.pdf
http://www.aanda.org/articles/aa/pdf/2012/08/aa19587-12.pdf
http://www.aanda.org/articles/aa/pdf/2013/06/aa20920-12.pdf
http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001MNRAS.327..452D&link_type=ARTICLE&db_key=AST&high=