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Author : Anonim
Publisher : Unknown
Page : 870 pages
File Size : 51,9 Mb
Release : 1999
Category : Gamma ray astronomy
ISBN : UOM:39015048121910
Author : Oswald H. W. Siegmund,Mark A. Gummin
Publisher : SPIE-International Society for Optical Engineering
Page : 670 pages
File Size : 46,9 Mb
Release : 1997
Category : Astronomical instruments
ISBN : 0819425362
Author : Cosimo Bambi
Publisher : Springer Nature
Page : 5912 pages
File Size : 50,7 Mb
Release : 2024-06-29
Category : Electronic
ISBN : 9789811969607
Author : Oswald H. W. Siegmund
Publisher : Society of Photo Optical
Page : 336 pages
File Size : 47,5 Mb
Release : 1993
Category : Science
ISBN : 0819412554
Author : Oswald H. W. Siegmund,Kathryn A. Flanagan,Society of Photo-optical Instrumentation Engineers
Publisher : SPIE-International Society for Optical Engineering
Page : 0 pages
File Size : 43,5 Mb
Release : 1999
Category : Science
ISBN : 0819432512
Author : Oswald H. W. Siegmund,Mark A. Gummin
Publisher : SPIE-International Society for Optical Engineering
Page : 710 pages
File Size : 47,7 Mb
Release : 1996
Category : Astronomical instruments
ISBN : 0819421960
Author : Anonim
Publisher : Unknown
Page : 604 pages
File Size : 48,7 Mb
Release : 2003
Category : Astronomical instruments
ISBN : UOM:39015048087806
Author : Charles J. Hailey,Oswald H. W. Siegmund
Publisher : Unknown
Page : 704 pages
File Size : 41,6 Mb
Release : 1989
Category : Science
ISBN : UOM:39015016949847
Author : Oswald H. W. Siegmund,John Vincent Vallerga,Society of Photo-optical Instrumentation Engineers
Publisher : Society of Photo Optical
Page : 492 pages
File Size : 44,8 Mb
Release : 1995
Category : Astronomical instruments
ISBN : 0819418773
Author : Sharad R. Kane
Publisher : Springer Science & Business Media
Page : 462 pages
File Size : 48,5 Mb
Release : 1975-06-30
Category : Science
ISBN : 9027705771
Proceedings of IAU Symposium No. 68 held in Buenos Aires, Argentina, 11-14 June 1974, organized by the IAU in co-operation with COSPAR
Author : Oswald H. W. Siegmund,Mark A. Gummin,Society of Photo-optical Instrumentation Engineers
Publisher : Society of Photo Optical
Page : 650 pages
File Size : 41,9 Mb
Release : 1998
Category : Science
ISBN : 0819429007
These papers present coverage from the SPIE Annual Meeting, this time focusing on EUV, X-ray, and gamma-ray instrumentation for astronomy.
Author : Oswald H. W. Siegmund,Society of Photo-Optical Instrumentation Engineers
Publisher : Unknown
Page : 537 pages
File Size : 50,9 Mb
Release : 1992
Category : Astronomical instruments
ISBN : OCLC:841354861
Author : Oswald H. W. Siegmund,John Vincent Vallerga
Publisher : Society of Photo Optical
Page : 438 pages
File Size : 44,5 Mb
Release : 1994
Category : Astronomical instruments
ISBN : 0819416045
Author : Stephen L. O'Dell,Giovanni Pareschi
Publisher : Unknown
Page : 128 pages
File Size : 49,8 Mb
Release : 2017
Category : Electronic
ISBN : 1510612564
Author : Willem Wamsteker,Malcolm S. Longair,Y. Kondo
Publisher : Springer Science & Business Media
Page : 721 pages
File Size : 51,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789401107945
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.
