Magnetic fields in the spiral galaxy NGC 2997

Details Magnetic fields in the spiral galaxy NGC 2997 Magnetic fields in the spiral galaxy NGC 2997

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..405h&link_type=abstract

Astronomy and Astrophysics, v.348, p.405-417 (1999)

Astronomy and Astrophysics

Astrophysics

28

Ism: Magnetic Fields, Galaxies: Magnetic Fields, Galaxies: Individual: Ngc 2997, Galaxies: Nuclei, Galaxies: Spiral, Galaxies: Structure

Scientific paper

We made multi-band radio observations of NGC 2997, including total power mapping at lambda20 with the Very Large Array (VLA), sensitive polarization observations at lambda13 cm with the Australia Telescope Compact Array (ATCA) and images at lambda6 and lambda3 cm with the VLA. The detected regular magnetic field extends from the centre to the outer disk. In the central part (galactic radius R<=0.5'), the dominated field has the form of an axisymmetric spiral in the nearby layer above the galactic plane. Such a field might be the result of an alpha -alpha dynamo. In the inner disk (0.5'1.5'), we found two so-called ``magnetic spiral arms'' starting near the major bifurcations of the optical arms. They are offset from the optical arms, extending from the inner to the outer disk and are up to 50% polarized. The magnetic arms might result from an interaction between the dynamo and the density wave. Alternatively, we propose that they may be associated with interarm gaseous features generated by perturbations of the spiral pattern.

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