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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present the analysis of 1,207 RR Lyrae found in photometry taken by theCatalina Survey's Mount Lemmon telescope. By combining accurate distances forthese stars with measurements for ~14,000 type-AB RR Lyrae from the CatalinaSchmid telescope, we reveal an extended association that reaches Galactocentricdistances beyond 100 kpc and overlaps the Sagittarius streams system. Thisresult confirms earlier evidence for the existence of an outer halo tidalstream resulting from a disrupted stellar system. By comparing the RR Lyraesource density with that expected based on halo models, we find the detectionhas ~8 sigma significance. We investigate the distances, radial velocities,metallicities, and period-amplitude distribution of the RR Lyrae. We find thatboth radial velocities and distances are inconsistent with current models ofthe Sagittarius stream. We also find tentative evidence for a division insource metallicities for the most distant sources. Following prior analyses, wecompare the locations and distances of the RR Lyrae with photometricallyselected candidate horizontal branch stars and find supporting evidence thatthis structure spans at least 60 deg of the sky. We investigate the prospectsof an association between the stream and unusual globular cluster NGC 2419.

Evidence for a Milky Way Tidal Stream Reaching Beyond 100 kpc