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        12. Quasars and Active Galactic Nuclei
- 
            
            
        Michael Werner
        
 and Peter Eisenhardt 
                                    
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                                            Chapters in this book
- Frontmatter i
 - CONTENTS vii
 - PREFACE ix
 - 1. Exploring the Universe in the Infrared 1
 - 2. The Sky as Seen by Spitzer 13
 - 3. The Birth of Stars and Planetary Systems 28
 - 4. Planetary Debris Disks–Windows on Exoplanetary Systems 45
 - 5. A Torrent of Exoplanets 62
 - 6. Probing the Solar System in the Infrared 79
 - 7. Comets Are Not Forever 91
 - 8. The Milky Way and Interstellar Matter: Stars and the Space Between 100
 - 9. Just Beyond the Milky Way 115
 - 10. Meet the Milky Way’s Neighbors 128
 - 11. Polling the Universe 141
 - 12. Quasars and Active Galactic Nuclei 153
 - 13. Galaxy Clusters: The Nodes in the Cosmic Web 164
 - 14. The Light of Other Days 177
 - 15. The Dim Boundary 192
 - 16. Returning Home 204
 - Appendix A. A Short History of the Spitzer Space Telescope 211
 - Appendix B. How Spitzer Works and How Spitzer Is Used 219
 - Acknowledgments 229
 - NOTES 233
 - Further Reading 257
 - Credits/Permissions 261
 - Credits for Epigraphs 268
 - INDEX 269
 
Chapters in this book
- Frontmatter i
 - CONTENTS vii
 - PREFACE ix
 - 1. Exploring the Universe in the Infrared 1
 - 2. The Sky as Seen by Spitzer 13
 - 3. The Birth of Stars and Planetary Systems 28
 - 4. Planetary Debris Disks–Windows on Exoplanetary Systems 45
 - 5. A Torrent of Exoplanets 62
 - 6. Probing the Solar System in the Infrared 79
 - 7. Comets Are Not Forever 91
 - 8. The Milky Way and Interstellar Matter: Stars and the Space Between 100
 - 9. Just Beyond the Milky Way 115
 - 10. Meet the Milky Way’s Neighbors 128
 - 11. Polling the Universe 141
 - 12. Quasars and Active Galactic Nuclei 153
 - 13. Galaxy Clusters: The Nodes in the Cosmic Web 164
 - 14. The Light of Other Days 177
 - 15. The Dim Boundary 192
 - 16. Returning Home 204
 - Appendix A. A Short History of the Spitzer Space Telescope 211
 - Appendix B. How Spitzer Works and How Spitzer Is Used 219
 - Acknowledgments 229
 - NOTES 233
 - Further Reading 257
 - Credits/Permissions 261
 - Credits for Epigraphs 268
 - INDEX 269