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

Resonance rings are the consequence of secular evolution processes thatredistribute material and angular momentum in discs. We produced a Catalogueand an Atlas of the rings detected in the Spitzer Survey of Stellar Structurein Galaxies (S4G) and to conduct a statistical study of the data in theCatalogue.  We traced the contours of rings previously identified by Buta et al. (inpreparation) and fitted them with ellipses. We found the orientation of bars bystudying the galaxy ellipse fits from S4G's Pipeline 4. We used the galaxyorientation data obtained by S4G's Pipeline 4 to obtain intrinsic ellipticitiesand orientations of rings and the bars.  ARRAKIS contains data on 724 ringed galaxies in the S4G. The frequency ofresonance rings in the S4G is of 16+-1% and 35+-1% for outer and innerfeatures, respectively. Outer rings are mostly found in Hubble stages -1<=T<=4.Inner rings are found in a distribution that covers the range -1<=T<=7. Weconfirm that outer rings have two preferred orientations, parallel andperpendicular to the bar. We confirm a tendency for inner rings to be orientedparallel to the bar, but we find that a significant fraction (~50%) of themhave random orientations with respect to the bar. These misaligned inner ringsare mostly found in late-type galaxies (T>=4). This may be due to spiral modesdecoupled from the bar dominating the Fourier amplitude spectrum at the radiusof the inner ring.  We find that the fraction of barred galaxies hosting outer (inner) rings is~1.7 times (~1.3 times) that in unbarred galaxies. The fact that rings are onlymildly favoured by bars suggests that those in unbarred galaxies either formeddue to weak departures from the axisymmetry of the galactic potential or thatthey are born because of bars that have been destroyed after the ringformation.

ARRAKIS: Atlas of Resonance Rings As Known In the S4G