Magnetic Fields and Mass Inflow in Central Regions of Barred Galaxies

Details Magnetic Fields and Mass Inflow in Central Regions of Barred Galaxies Magnetic Fields and Mass Inflow in Central Regions of Barred Galaxies

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..216b&link_type=abstract

THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 216-222 (2

Computer Science

5

Radiogalaxies, Intergalactic Magnetic Fields, Star Formation, Galactic Nuclei, Radio Galaxies, Spiral Galaxies, Electric And Magnetic Fields, Origin, Formation, Evolution, Age, And Star Formation, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

Radio continuum emission is an excellent tracer of star formation in central regions of galaxies. We observed a sample of 20 galaxies with massive bars. The regular magnetic fields around the bar, as traced by the polarized emission, do not always follow the gas flow predicted from numerical simulations and show little compression by the shock. The galaxies with the longest bars show the strongest deviations of the magnetic field pattern from axial symmetry, and most of them host nuclear rings. The total magnetic fields in these nuclear rings of up to ~= 100 μG are among the strongest fields known in spiral galaxies. The regular field in the nuclear ring of NGC 1097 is of spiral shape. Magnetic stress in the ring can drive mass inflow of about one solar mass per year which is sufficient to feed the active nucleus. This process may also work in non-barred galaxies.

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