Astrophysics and Space Science Library

Frontiers Of Space And Ground-Based Astronomy

The Astrophysics of the 21st Century

Editors: Wamsteker, Willem, Longair, Malcolm S., Kondo, Y. (Eds.)

Free Preview

Buy this book

eBook $299.00
price for USA in USD (gross)
  • ISBN 978-94-011-0794-5
  • Digitally watermarked, DRM-free
  • Included format: PDF
  • ebooks can be used on all reading devices
  • Immediate eBook download after purchase
Hardcover $499.99
price for USA in USD
  • ISBN 978-0-7923-2527-7
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
Softcover $299.99
price for USA in USD
  • ISBN 978-94-010-4341-0
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
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.

Table of contents (126 chapters)

Table of contents (126 chapters)

Buy this book

eBook $299.00
price for USA in USD (gross)
  • ISBN 978-94-011-0794-5
  • Digitally watermarked, DRM-free
  • Included format: PDF
  • ebooks can be used on all reading devices
  • Immediate eBook download after purchase
Hardcover $499.99
price for USA in USD
  • ISBN 978-0-7923-2527-7
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
Softcover $299.99
price for USA in USD
  • ISBN 978-94-010-4341-0
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
Loading...

Recommended for you

Loading...

Bibliographic Information

Bibliographic Information
Book Title
Frontiers Of Space And Ground-Based Astronomy
Book Subtitle
The Astrophysics of the 21st Century
Editors
  • Willem Wamsteker
  • Malcolm S. Longair
  • Y. Kondo
Series Title
Astrophysics and Space Science Library
Series Volume
187
Copyright
1994
Publisher
Springer Netherlands
Copyright Holder
Kluwer Academic Publishers
eBook ISBN
978-94-011-0794-5
DOI
10.1007/978-94-011-0794-5
Hardcover ISBN
978-0-7923-2527-7
Softcover ISBN
978-94-010-4341-0
Series ISSN
0067-0057
Edition Number
1
Number of Pages
XXIII, 750
Topics