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 combine the Siding Spring Survey of RR Lyrae stars with the SouthernProper Motion Catalog 4, in order to detect and kinematically characterizeoverdensities in the inner halo of the Milky Way. We identify one suchoverdensity above the Galactic plane, in quadrant 4 of the Galaxy. Theoverdensity extends at least 20 degrees in longitude, has an averageheliocentric distance of 8 kpc with a depth of 4 kpc, and is confined within 4kpc of the Galactic plane. Its metallicity distribution is distinct from thatof the field population having a peak at -1.3 and a pronounced tail to -2.0.Proper motions indicate a net vertical motion away from the plane, and a loworbital angular momentum. Qualitatively, these orbit properties suggest apossible association with omega Centauri's parent satellite. However,comparison to a specific omega Cen N-body disruption model does not give a goodmatch with observations. Line-of-sight velocities, and more extensive N-bodymodelling will help clarify the nature of this overdensity.

A Kinematically-Distinct RR-Lyrae Overdensity in the Inner Regions of the Milky Way