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 combine optical and radio observations to trace the spiral structure inthe Third Quadrant of the Milky Way. The optical observations consist of alarge sample of young open clusters and associations, whereas the radioobservations consist of a survey of nearby and distant clouds observed in CO.Both the optical and radio samples are the largest ones insofar present in theliterature. We use this unique material to analyze the behavior of interstellarextinction and to trace the detailed structure of the Third Galactic Quadrant(TGQ).We find that the Outer (Cygnus) grand design spiral arm is traced bystellar and CO components while the Perseus arm is traced solely by CO and ispossibly being disrupted by the crossing of the Local (Orion) arm. The Localarm is traced by CO and young stars toward l = 240 degrees and extends for over8 kpc along the line of sight reaching the Outer arm. Finally, we characterizethe Galactic warp and compare the geometries implied by the young stellar andCO components.

Spiral structure in the outer Galactic disk. I. The Third Galactic Quadrant