| 書目名稱 | Frontiers Of Space And Ground-Based Astronomy | | 副標題 | The Astrophysics of | | 編輯 | W. Wamsteker,M. S. Longair,Y. Kondo | | 視頻video | http://file.papertrans.cn/350/349338/349338.mp4 | | 叢書名稱 | Astrophysics and Space Science Library | | 圖書封面 |  | | 描述 | 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 | | 出版日期 | Book 1994 | | 關鍵詞 | Cosmology; Gravity; Observatories; Universe; astronomy; astrophysics | | 版次 | 1 | | doi | https://doi.org/10.1007/978-94-011-0794-5 | | isbn_softcover | 978-94-010-4341-0 | | isbn_ebook | 978-94-011-0794-5Series ISSN 0067-0057 Series E-ISSN 2214-7985 | | issn_series | 0067-0057 | | copyright | Kluwer Academic Publishers 1994 |
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