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The study of AGN is one of the most dynamic areas of contemporary astronomy, involving onefifth of all research astronomers. This textbook provides a systematic review of the observed properties of AGN across the entire electromagnetic spectrum, examines the underlying physics, and shows how the brightest AGNquasarscan be used to probe the farthest reaches of the Universe. This timely textbook is a clear, comprehensive and selfcontained introduction to active galactic nuclei (AGN)for advanced undergraduates and graduate students in astronomy and physics.
⚠️ WARNING (California Proposition 65):
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birth defects, or other reproductive harm.
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