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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the integral-field kinematics and stellar population properties of64 galaxies (61 are Early-Type galaxies, ETGs) with Counter-Rotating stellarDisks (CRD) selected from about 4000 galaxies in the MaNGA survey, based onevidence of counter-rotation or two velocity dispersion peaks in the kinematicmaps. For 17 CRDs, the counter-rotating components can also be separatedspectroscopically. The frequency of CRDs in MaNGA is <5% for ellipticals, <3%for lenticulars and <1% for spirals (at 95% confidence level), consistent withprevious estimates. We produced age and metallicity maps, and compared thestellar population properties to those of the general ETGs population. We foundthat CRDs have similar trends in age and metallicity to ETGs, but are lessmetallic at low masses, and show flatter age and steeper metallicity gradients,on average. A comparison of the velocity fields of the ionized gas and thestars reveals that in 33 cases the gas corotates with either the inner (15cases) or outer (18 cases) stellar disk, in 9 cases it is misaligned. In mostcases the gas corotates with the younger disk. Evidence of multimodality in thestellar population is found in 31 galaxies, while the 14 youngest and leastmassive galaxies show ongoing star formation; 14 galaxies, instead, exhibitunimodality, and are the oldest and most massive. As a general result, our workindicates that CRDs form primarily via gas accretion in retrograde rotationwith respect to a pre-existing stellar disk.

monthly notices of the royal astronomical society

SDSS-IV MaNGA: Integral-field kinematics and stellar population of a  sample of galaxies with counter-rotating stellar disks selected from about  4000 galaxies