AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 30. Cosmological Probes and Parameters
Oral, Monday, May 31, 1999, 2:00-3:30pm, International Ballroom South

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[30.04] Cosmic Magnetic Fields from Recombination to Reionization

K. Jedamzik (MPA Garching, Germany)

Cosmic magnetic fields, present at the time around recombination, may have an important impact on the early formation of small-scale structure in the universe by non-gravitational means. A summary of the relevant physical scales entering into the dynamics of a magnetized cosmic baryon fluid and presently known observational constraints on the existence of such fields are given. It is shown that for observationally allowed field strength of B~ 10-9Gauss (scaled to the present) local baryon over-densities, \delta\rhob/rhob, as large as ~10 - 103 on comoving scales of ~100pc - 1kpc may be dynamically generated by magnetic fields even before the epoch of recombination. Non-linear baryon clustering on larger spatial scales may occur after recombination. The significant impact which such baryonic clumping may have on galaxy formation, reionization, and the intergalactic medium is discussed.

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