1. Active Versus Normal Galaxies

2. Optical Spectrum of a Typical Active Galaxy

3. Optical Spectra of Active Galaxies

4. X-ray Emission from an Active Galactic Nucleus

5. Broad-Band Spectrum of an Active Galaxy

6. Variability of Active Galaxies

7. Rapid X-ray Variability of Active Galaxies

8. Evidence for Relativistic Motions from X-ray Spectroscopy
XMM-Newton

9. Particle Jets from Active Galaxies

10. Particle Jets from NGC 6251 Notice the collimation
on a huge range of size
scales.

11. The Particle Jet from M87

12. Historical Overview of Early Active Galaxy Studies

13. Artist’s Impression of the Black-Hole + Accretion-Disk Model

14. Innermost Part of the Accretion Disk
Surface of the Sun

15. Model for Jet Formation

16. Active Galaxies are Common
The Chandra Deep Field-North

17. Cosmic Evolution of Luminous Quasars

18. Lack of Spectral Evolution
Optical spectra do not
evolve significantly
X-ray-to-optical flux ratio does
not evolve significantly

19. Some Active Galaxy Researchers

20. A Supermassive Black Hole in Hibernation at the Center of Our Galaxy

21. Hibernating Supermassive Black Holes in Most Galaxies
This strong relation suggests a link
between galaxy formation and the
growth of supermassive black holes.

22. Feedback from Active Galaxy Winds?

23. Feedback from Active Galaxy Winds?