## Abstract Extensive programs of followβup observations of hard Xβray selected sources have unambiguously revealed that the sources of the Xβray background are characterized by an extremely large dispersion in their optical magnitude and spectroscopic classification. Here we present the results of
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X-ray Surveys, in the light of the new observatories
β Scribed by X. Barcons
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 36 KB
- Volume
- 324
- Category
- Article
- ISSN
- 0004-6337
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