# The AGN Paradigm for Radio-Loud Objects

**Authors:** Meg Urry  
**arXiv:** [astro-ph/0301309](https://arxiv.org/abs/astro-ph/0301309)  
**Date:** 2003-01-16  
**Summary page:** https://www.summarizepaper.com/en/paper/astro-ph--0301309v1/

## Key points

- AGN paradigm for radio-loud objects involves relativistic jets originating near the central supermassive black hole
- Jets form large-scale radio sources at parsec to kiloparsec to megaparsec distances
- Jets are energetically significant and often represent the bulk of the energy extracted from the accretion process
- Host galaxies appear to be normal luminous ellipticals, supporting the "Grand Unification" scenario wherein AGN are a transient phase in the evolution of every galaxy
- Black hole mass appears to be largely uncorrelated with bolometric luminosity, Eddington ratio, radio luminosity or radio loudness
- Other factors may be at play in determining the properties of these objects
- Study of AGN is important not only for understanding their own unique characteristics but also for gaining insight into galaxy formation and evolution as a whole.

## Summary

The AGN (Active Galactic Nuclei) paradigm for radio-loud objects, as described by Meg Urry, involves relativistic jets originating near the central supermassive black hole and forming large-scale radio sources at parsec to kiloparsec to megaparsec distances. These jets are energetically significant and often represent the bulk of the energy extracted from the accretion process. Host galaxies appear to be normal luminous ellipticals, supporting the "Grand Unification" scenario wherein AGN are a transient phase in the evolution of every galaxy. Interestingly, black hole mass appears to be largely uncorrelated with bolometric luminosity, Eddington ratio, radio luminosity or radio loudness. This suggests that there may be other factors at play in determining the properties of these objects. The study of AGN is important not only for understanding their own unique characteristics but also for gaining insight into galaxy formation and evolution as a whole.