Author: Publisher:
ISBN:
Category : Galactic nuclei
Languages : en
Pages : 432
Book Description
International Ultraviolet Explorer - Uniform Low Dispersion Archive
Author: International Ultraviolet Explorer--Uniform Low Dispersion Archive
Author: Ana I. Goméz de CastroPublisher:
ISBN:
Category : T Tauri stars
Languages : en
Pages : 368
Book Description
NASA Newsletter for International Ultraviolet Explorer (IUE).
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 480
Book Description
Scientific and Technical Aerospace Reports
Author: International Ultraviolet Explorer (IUE) NASA Newsletter
Author: Internet Resources for Professional Astronomy
Author: Mark KidgerPublisher: CUP Archive
ISBN: 9780521663083
Category : Computers
Languages : en
Pages : 350
Book Description
Comprehensive guide to astronomy on the internet written for astronomers and astrophysicists.
Library and Information Services in Astronomy
Author: International Astronomical Union. ColloquiumPublisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 272
Book Description
Chromospherically Active Binary Stars
Author: Constanze La DousPublisher:
ISBN:
Category : Double stars
Languages : en
Pages : 260
Book Description
Frontiers Of Space And Ground-Based Astronomy
Author: Willem WamstekerPublisher: Springer Science & Business Media
ISBN: 9401107947
Category : Science
Languages : en
Pages : 721
Book Description
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.
Astronomy from Large Databases
Author: European Southern ObservatoryPublisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 536
Book Description