Evolution of magnetic fields in galaxies Dmitry Sokoloff Moscow State University Moscow, Russia in collaboration with R.Beck, T.G.Arshakian, M.Krause,

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Presentation transcript:

Evolution of magnetic fields in galaxies Dmitry Sokoloff Moscow State University Moscow, Russia in collaboration with R.Beck, T.G.Arshakian, M.Krause, D.Moss MAGNETIC FIELDS ON SCALES FROM KILOPARCECS TO KILOMETERS: PROPERTIES AND ORIGIN Cracow, Poland May 17 – 21, 2010

We understand more or less how to fit magnetic fields in contemporary spiral galaxis by conventional dynamo models It requires a detailed knowledge of galactic HD, dynamo governing parameters etc. A detailed analysis of observations for a particular galaxy. A typical example here is M31.

Future observations by SKA Large redshifts z, remote galaxies. Very little is known concerning HD, evolution etc. A reasonable decision would be to postpone with any prediction.... An expected development: no observations in future A demand: give a hint what do you expect for magnetic fields of first galaxies

A most straightforward set of parameters -----> time is too short Seeds in protogalaxies + conventional mean-field dynamo

Seed in protogalaxies + small-scale dynamo + mean-field dynamo It works!!!! A stage of spotty structure. In principle one can observe it.

We can play with parameters. Dwarf galaxies.

Homogeneous relic field+ dynamo: it works unexpectedly bad (recent simulations of D.Moss)

Rotation expels homogeneous field on the remote part of the galaxy (recent simulations of D.Moss)