The Milky Way tomography with Subaru Hyper Suprime-Cam. II. Smooth halo structure

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ID: 337880
2026
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Abstract
Abstract We investigate the structure of the Milky Way’s stellar halo within 70 kpc of the Sun using a wide-field photometric catalog obtained from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (HSC-SSP). We employ a large sample of main-sequence turn-off stars as distance tracers. To robustly derive the structural parameters of the stellar halo, we develop a forward-modeling framework that explicitly accounts for distance uncertainties, the solar position, and the limited sky coverage of the survey. Applying this method to the HSC-SSP catalog, we found that the smooth stellar halo is well described by a double power-law density profile, with inner and outer slopes of approximately $-3.3$ and $-4.8$, respectively, with a break radius of 17.4 kpc. The outer steep density slope derived in this work supports a picture in which the present-day structure of the Milky Way’s stellar halo is influenced by early massive accretion events, consistent with inferences from kinematic substructures such as Gaia Enceladus/Sausage. Ongoing wide-field imaging surveys, including UNIONS and LSST, will provide further constraints on the structure of the stellar halo and key insights into its formation history.
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Authors Yoshihisa Suzuki, Masashi Chiba, Rosemary F. Ġ. Wyse, Shunichi Horigome
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Journal publications of the astronomical society of japan
Year 2026
DOI
10.1093/pasj/psag149
URL
https://doi.org/10.1093/pasj/psag149
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