The Universe At Z


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    • Author:  by When And  Martin J. Rees  

    • Abstract:  This paper considers how the first subgalactic structures produced the UV radiation that ionized the intergalactic medium before z = 5, and the `feedback' effects of the UV radiation on structure formation. The relevance of pregalactic activity to heavy element production and the origin of magnetic fields is briefly addressed. 1 Introduction

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