MfuThree

Summary of the Magnetic fields in the Universe III conference (​http://www.oa.uj.edu.pl/mfu2011/):

Reconnection:

-what triggers it?

-what determines its rate?

-what's the condition for fast reconnection?

-turbulence? fractal reconnection?, plasmoid-induced reconnection?

-what is its role in: MRI, star formation, dynamo, acceleration of jets?

-may reconnection jets may be observed in the ISM?

-does reconnection jet leads to shocks and possibly triggers SF (Tanuma & hibata 2007, PASJ, 59)?

-turbulent FAST reconnection

Particle acceleration:

-what are the mechanisms?

-what fraction of mag energy goes goes to non-thermal particle acceleration in reconnection?

Star formation (SF) cores: -Partially ionized phase with strong fields?

-b-fields strength and morphology in extended clouds & cores?

-diffusion mechanisms leading to SF cores?

-cloud and star formation schemes with turbulence and b-fields … the path to form clouds may be important

Milky way:

-NGC 6744 is the most similar galaxy to ours

-large scale reversals in the disk

-odd-symmetry halo fields?

-strong vertical fields in the central region

-existing fields models seem insufficient

-pulsar RM data: local fields is clock wise, but the fields in Sagittarius arm is counter-clockwise; one reversal.

-RM from background sources possibly dominated by HI structures

-field models should accept that spiral arms of the Galaxy are not regular

-the regular fields may not be located in the spiral arms

-model should include halo fields

-simple quadrupole models are wrong.

-MRI-driven dynamos. Consistent with obs?, cooling?, ionization fraction?

Galaxies

-there are halo fields (Marita Krause). Indication of galactic winds

-there are inter galactic fields and turbulent fields. Polarized radio intensity is a signature of ISM turbu.

-no dynamo without wind

-Caution: distinguish between anisotropic fields (compression or shear; stronger in density-wave galaxies) from truly regular ones.

-butterfly diagram of fields patterns from MRI models (Mami Machida). Statistics of even/odd-symmetry fields patterns are needed.

More questions:

-the golden age of polarimetry is comming.

-Key observations to be done before MFU4?

-Do we expect answers or more questions from the the SKA and LOFAR?

-ALMA will zoom in to SF cores

-SFRxMF correlation in gals. evidence of turbulent dynamo?

-origin of B in diffuse IGM (TeV - GeV obs. > 10-16G. Seed fields of cosmological origin/phase transition or Biermann battery

-diagnostic with GENUS/TSALLIS (?) statistics in turbulence

-reliable foreground maps based on turbulence to remove from CMB maps - PLANCK

-mean field dynamo models. realistic or not?

-stability of jets at all scales

-combine different obs. in a better way

-what theoretical work is necessary?

-what to "bridge" the gaps between theory, sims and ob?

Comments

No comments.