PIRSA:11020118

Video URL

http://pirsa.org/11020118

The Eddington Limit in Cosmic Rays

Socrates, A. (2011). The Eddington Limit in Cosmic Rays. Perimeter Institute for Theoretical Physics. http://pirsa.org/11020118

Socrates, Aristotle. The Eddington Limit in Cosmic Rays. Perimeter Institute for Theoretical Physics, Feb. 10, 2011, http://pirsa.org/11020118 

          @misc{ scitalks_PIRSA:11020118,
            doi = {},
            url = {http://pirsa.org/11020118},
            author = {Socrates, Aristotle},
            keywords = {Cosmology},
            language = {en},
            title = {The Eddington Limit in Cosmic Rays},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020118 see, \url{https://scivideos.org/PIRSA/11020118}}
          }

Aristotle Socrates Institute for Advanced Study (IAS)

Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

In terms of their energetics, cosmic ray protons are an insignificant by-product of star formation and super-massive black hole growth. However, due to their small mean free path, their coupling with the interstellar medium is absolute. In fact, they are most likely, the dominant source of momentum, and therefore kinetic force on galactic scales. By defining an Eddington Limit in Cosmic Rays, we show that the maximum photon luminosity of bright galaxies and quasars are capped by the production and subsequent expulsion of cosmic ray protons. Such simple arguments may explain why bright galaxies are faint in comparison to quasars and why super-massive black holes are relatively mass-less in comparison to galaxies.