The Dichotomy of the Halo of the Milky Way
Daniela Carollo (1), Timothy C. Beers (2) ((1) Research School of, Astronomy, Astrophysics, Mount Stromlo Observatory, The Australian, National University, Australia, and INAF, Osservatorio Astronomico di Torino,, Italy, (2) Department of Physics, Astronomy
TL;DR
This paper presents evidence that the Milky Way's halo consists of two distinct stellar components with different properties, affecting galaxy formation theories.
Contribution
It provides a comprehensive analysis of SDSS data revealing the dual nature of the Milky Way's stellar halo, a novel insight into galactic structure.
Findings
Identification of two overlapping stellar components in the halo.
Different chemical compositions between the two halo structures.
Distinct spatial distributions and kinematic behaviors.
Abstract
We summarize evidence that the halo of the Milky Way comprises two different, and broadly overlapping, stellar components. The two structures exhibit different chemical compositions, spatial distributions, and kinematics. These results were obtained through an analysis of more than 20,000 calibration stars from the Sloan Digital Sky Survey (SDSS). The duality of the stellar halo directly impacts galaxy formation models, for the Milky Way and other large spirals.
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