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

Using a sample of over 70, 000 red clump (RC) stars with $5$-$10$% distanceaccuracy selected from the LAMOST Spectroscopic Survey of the GalacticAnti-center (LSS-GAC), we study the radial and vertical gradients of theGalactic disk(s) mainly in the anti-center direction, covering a significantdisk volume of projected Galactocentric radius $7 \leq R_{\rm GC} \leq 14$ kpcand height from the Galactic midplane $0 \leq |Z| \leq 3$ kpc. Our analysisshows that both the radial and vertical metallicity gradients are negativeacross much of the disk volume probed, and exhibit significant spatialvariations. Near the solar circle ($7 \leq R_{\rm GC} \leq 11.5$ kpc), theradial gradient has a moderately steep, negative slope of $-0.08$ dexkpc$^{-1}$ near the midplane ($|Z| < 0.1$ kpc), and the slope flattens withincreasing $|Z|$. In the outer disk ($11.5 < R_{\rm GC} \leq 14$ kpc), theradial gradients have an essentially constant, much less steep slope of $-0.01$dex kpc $^{-1}$ at all heights above the plane, suggesting that the outer diskmay have experienced an evolution path different from that of the inner disk.The vertical gradients are found to flatten largely with increasing $R_{\rmGC}$. However, the vertical gradient of the lower disk ($0 \leq |Z| \leq 1$kpc) is found to flatten with $R_{\rm GC}$ quicker than that of the upper disk($1 < |Z| \leq 3$ kpc). Our results should provide strong constraints on thetheory of disk formation and evolution, as well as the underlying physicalprocesses that shape the disk (e.g. gas flows, radial migration, internal andexternal perturbations).

On the metallicity gradients of the Galactic disk as revealed by LSS-GAC red clump stars