AGN over cosmic time
Here are some useful papers on AGN:
- Osterbrock & Ferland, Astrophysics of Gaseous Nebulae and Active Galactic Nuclei, 2nd Edition
- Antonucci, R. (1993). UNIFIED MODELS FOR ACTIVE GALACTIC NUCLEI AND. ARAA
- Fabian, a. C. (2011). Observational Evidence for Active Galactic Nuclei Feedback. ARAA
- Ho, L. C. (2008). Nuclear Activity in Nearby Galaxies. ARAA
- Kauffmann, G., & Heckman, T. (2003). The host galaxies of active galactic nuclei. MNRAS
- Merloni, A., & Heinz, S. (2008). A synthesis model for AGN evolution: supermassive black holes growth and feedback modes. MNRAS
http://blog.galaxyzoo.org/2012/07/12/something-rich-and-strange-hubble-eyes-ngc-5972/