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and Cosmology

Extragalactic Astronomy and Cosmology: An Introduction

Extragalactic Astronomy and Cosmology: An Introduction

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5.6 AGNs <strong>and</strong> <strong>Cosmology</strong><br />

221<br />

ize hydrogen (Fig. 5.41). If such a system is located<br />

at z limit in the spectrum of a QSO, the spectrum<br />

at λ

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