English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the discovery of a coherent magnetic spiral structure within thenearby ringed Sab galaxy NGC 4736. High sensitivity radio polarimetric dataobtained with the VLA at 8.46GHz and 4.86GHz show a distinct ring of totalradio emission precisely corresponding to the bright inner pseudoring visiblein other wavelengths. However, unlike the total radio emission, the polarizedradio emission reveals a clear pattern of ordered magnetic field of spiralshape, emerging from the galactic centre. The magnetic vectors do not followthe tightly-wrapped spiral arms that characterize the inner pseudoring, butinstead cross the ring with a constant and large pitch angle of about 35deg.The ordered field is thus not local adjusted to the pattern of star-formationactivity, unlike what is usually observed in grand-design spirals. The observedasymmetric distribution of Faraday rotation suggests the possible action of alarge-scale MHD dynamo. The strong magnetic total and regular field within thering (up to 30microG and 13microG, respectively) indicates that a highlyefficient process of magnetic field amplification is under way, probablyrelated to secular evolutionary processes in the galaxy.

Discovery of a strong spiral magnetic field crossing the inner pseudoring of NGC 4736