Overview
- Editors:
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W. Wamsteker
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ESA IUE Observatory VILSPA, Madrid, Spain
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M. S. Longair
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Cavendish Laboratory, University of Cambridge, Cambridge, UK
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Y. Kondo
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NASA/GSFC, Greenbelt, USA
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Table of contents (126 chapters)
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The New Generation Space Telescopes
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- R. Viotti, M. Amoretti, M. Badiali, A. Cassatella, F. Giovannelli, A. Preite Martinez
Pages 507-507
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- G. K. Miley, F. Macchetto, R. Brown, J. M. Deharveng, R. Fosbury, R. Kudritzki et al.
Pages 509-512
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- Charles A. Beichman, Michael W. Werner
Pages 517-520
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- A. H. A. Thronson, B. T. G. Hawarden
Pages 521-522
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New Technologies for Astronomy
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Front Matter
Pages 525-525
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- M. A. C. Perryman, A. Peacock, N. Rando, A. Van Dordrecht, P. Videler, C. L. Foden
Pages 537-539
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Summary; Priorities and Objectives For The 21st Century
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Front Matter
Pages 541-541
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- M. Longair, M. Oda, E. Tchurazov, M. Tarenghi
Pages 543-548
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Stars
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Front Matter
Pages 549-551
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- F. Giovannelli, L. Errico, A. A. Vittone, G. S. Bisnovatyi-Kogan, V. G. Kurt, S. A. Lamzin et al.
Pages 553-554
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- P. S. Thé, F. J. Molster
Pages 555-558
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- C. A. Grady, M. R. Pérez, D. De Winter, P. S. Thé, F. Yusef-Zadeh, S. D. Johnson
Pages 559-560
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- Bruce Mccollum, Michael Castelaz
Pages 561-562
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- M. R. Pérez, C. A. Grady, M. Van Den Ancker, P. S. Thé, D. De Winter, R. Schulte-Ladbeck et al.
Pages 563-564
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- K. A. Van Der Hucht, P. M. Williams, D. Y. A. Setia Gunawan, W. Wamsteker, A. M. T. Pollock, P. Bouchet et al.
Pages 565-566
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- H. F. Henrichs, L. Kaper, H. Ando, R. Hirata, E. Kambe, K. Bjorkman et al.
Pages 567-569
About this book
ROSAT Observations G. HASINGER Max-Planck-Institut flir extraterrestrische Physik, D-85740 Garching, Germany Abstract. This review describes the most recent advances in the study of the extragalactic soft X-ray background and what we can learn about its constituents. The deepest pointed observations with the ROSAT PSPC are discussed. The logN-logS relation is presented, which reaches to the faintest X-ray fluxes and to the highest AGN surface densities ever achieved. The N(>S) relation shows a 2 density in excess of 400 deg- at the faintest fluxes and a flattening below the Einstein Deep Survey limit. About 60% of the extragalactic background has been resolved in the deepest field. Detailed source spectra and first optical and radio identifications will be discussed. The results are put into perspective of the higher energy X -ray background. Key words: X-rays, background radiations, active galactic nuclei. 1. Introduction The extragalactic X-ray background (XRB), discovered about 30 years ago, has been studied extensively with many X-ray experiments, in particular with the satel lites HEAO I and II (see ego Boldt 1987) and with ROSAT (e. g. Hasinger et aI. , 1993). Figure 1 shows a compilation of some of the most recent spectral measure ments for the X-ray background. Over the energy range from 3 to about 100 keY its spectrum can be well approximated by an optically thin thermal bremsstrahlung model with kT ~ 40 keY, while at lower X-ray energies a steepening into a new component has been observed observed (e. g.
Editors and Affiliations
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ESA IUE Observatory VILSPA, Madrid, Spain
W. Wamsteker
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Cavendish Laboratory, University of Cambridge, Cambridge, UK
M. S. Longair
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NASA/GSFC, Greenbelt, USA
Y. Kondo