An Intergalactic Magnetic Field from Quasar Outflows

Details An Intergalactic Magnetic Field from Quasar Outflows An Intergalactic Magnetic Field from Quasar Outflows

2001-10-03

arxiv.org/abs/astro-ph/0110090v1

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, to appear in the proceedings of the conference "Lighthouses of the Universe: The Most Luminous Celestial O

Scientific paper

10.1007/10856495_64

Outflows from quasars inevitably pollute the intergalactic medium (IGM) with magnetic fields. The short-lived activity of a quasar leaves behind an expanding magnetized bubble in the IGM. We model the expansion of the remnant quasar bubbles and calculate their distribution as a function magnetic field strength at different redshifts. We find that by a redshift z ~ 3, about 5-80% of the IGM volume is filled by magnetic fields with an energy density > 10% of the mean thermal energy density of a photo-ionized IGM (at ~ 10^4 K). As massive galaxies and X-ray clusters condense out of the magnetized IGM, the adiabatic compression of the magnetic field could result in the fields observed in these systems without a need for further dynamo amplification.

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