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 have discovered a clear sign of the disruption phase of the Perseus arm inthe Milky Way using Cepheid variables, taking advantage of the accuratelymeasured distances of Cepheids and the proper motions from Gaia Data Release 1.Both the Galactocentric radial and rotation velocities of 77 Cepheids within1.5 kpc of the Perseus arm are correlated with their distances from the locusof the Perseus arm, as the trailing side is rotating faster and moving inwardcompared to the leading side. We also found a negative vertex deviation for theCepheids on the trailing side, $-27.6\pm2.4$ deg, in contrast to the positivevertex deviation in the solar neighborhood. This is, to our knowledge, thefirst direct evidence that the vertex deviation around the Perseus arm isaffected by the spiral arm. We compared these observational trends with our$N$-body/hydrodynamics simulations based on a static density-wave spiralscenario and those based on a transient dynamic spiral scenario. Although ourcomparisons are limited to qualitative trends, they strongly favor a conclusionthat the Perseus arm is in the disruption phase of a transient arm.

Gaia DR1 evidence of disrupting Perseus Arm