PPT Slide

• ‘Limited’ extragalactic region, r=300Mpc estimate 1000 radio galaxies in that region, emitting 10 -10 J in their lifetime, 10 yrs.

• Volume of region, V~10 m

53

55

6

75

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We imagine a spherical region with a radius of 300 Mpc (ie a volume of 1e75m), and fill it with 1000 radio galaxies. Throughout a typical lifetime of about a million years, each galaxy emits about 1e53 to 1e55 Joules.

(These are reasonable assumptions for the local supercluster - the energy output is on the optimistic side)