Springer

Joachim E. Trümper Gü nther Hasinger

Max-Planck-Institut fü r extraterrestische Physik

Giessenbachstraße

85748 Garching

Germany

E-mail: [email protected] [email protected]

Cover illustrations: above: ROSAT all-sky survey; from Max-Planck-Institut fuer extraterrestrische Physik; below: 15. Nov. 2006, Credit: NASA/CXC/MIT/UMass Amherst/M.D. Stage et al.

Library of Congress Control Number: 2007933496

ISSN 0941-7834

ISBN 978-3-540-34411-7 Springer Berlin Heidelberg New York

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