Global maps of the Milky Way, showing the average distribution of [Fe/H] (left), [Mg/Fe] (middle), and stellar age (right) across the Galaxy. The top row of panels shows a face-on view (X–Y plane), integrated through the disk with ∣Z∣ ≤ 1.0 kpc. The bottom row of panels shows an edge-on view (R–Z plane, with R preserving the sign of X to show the opposite side of the Galaxy), integrated through the whole disk. Colors encode the median quantities in each or X − Y or R − Z pixel. In the face-on views, the age and metallicity gradients are visible, with the Galactic bar standing out as metal-rich and α-poor. The location of the Sun at X = − 8.3 kpc is denoted by the solar symbol (⊙), and the Galactic center is marked with a plus (+). The approximate location of the Galactic bar is also shown as an ellipse with major axis length 10 kpc, a 0.4 axis ratio, and rotated 25°.

A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE

Julie Imig, Cathryn Price, Jon Holtzman, Alexander Stone-Martinez, + 16 others
ApJ, 2023

ADS

Abstract

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