X-Ray astronomy-2009 : present status, multi-wavelength approach and future perspectives : proceedings of the international conference, Bologna, Italy, 7-11 September 2009 / editors, Andrea Comastri, Massimo Cappi, Lorella Angelini ; sponsoring organizations, NASA, ESA (European Space Agency), INAF (Italian Nationallnstitue [i.e. National Institute] for Astrophysics), [and] UNlBO (University of Bologna, Astronomy Department).