News and Views
Nature Physics 3, 450 - 451 (2007)
doi:10.1038/nphys662
Subject Category: Astrophysics
Cosmic X-ray background: An old, yet new story
Yoshihiro Ueda1
- Yoshihiro Ueda is in the Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan. e-mail: ueda@kusastro.kyoto-u.ac.jp
Abstract
Owing to difficulties in directly detecting them, the number of extremely obscured black holes in the universe is unknown. Measurements of the cosmic X-ray background shed light on this mystery.
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