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

The Sun in not located in a major spiral arm, and sits in a small Local Arm(variously called arm, armlet, blob, branch, bridge, feather, finger, segment,spur, sub-arm, swath, etc). The diversity of names for the Local Arm near theSun indicates an uncertainty about its shape or pitch or its extent from theSun in each galactic quadrant, as well as an uncertainty about its origin. Herewe extract data about the small Local Arm near the Sun, from the recentobservational literature, over many arm tracers, and we use statistics in orderto find the its mean extent from the Sun, its possible shape and pitch anglefrom the direction of galactic longitude 90 degrees. Employing all tracers, theLocal Arm is about 4 kpc long by 2 kpc large. The Sun is within 1 kpc of thecenter of the local arm.  Proposed bridges and fingers are assessed. These bridges to nearby spiralarms and fingers across spiral arms may not reach the nearest spiral arms,owing to kinematic and photometric distance effects. We then compare thesestatistical results with some predictions from recent models proposed toexplain the local arm (perturbations, resonances, density wave, halosupercloud, debris trail from a dwarf galaxy).  The least controversial models involve importing materials from elsewhere(halo supercloud, debris trail) as a first step, and to be later deformed in asecond step (by the Galactic differential rotation into become roughly parallelto spiral arms) and then subjected to ongoing forces (global density waves,local perturbations).

Meta-analysis from different tracers of the small Local Arm around the Sun - extent, shape, pitch, origin