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Revealing mass distributions of dwarf spheroidal galaxies in the Subaru-PFS era

Published online by Cambridge University Press:  30 October 2025

K. Hayashi Open the ORCID record for K. Hayashi [Opens in a new window] ,
L. Dobos ,
C. Filion ,
E. Kirby ,
M. Chiba Open the ORCID record for M. Chiba [Opens in a new window] ,
R. Wyse  and
PFS Galactic Archaeology Science Working Group
K. Hayashi*
Affiliation:
National Institute of Technology, Sendai College, Natori, Miyagi 981-1239, Japan National Institute of Technology, Ichinoseki College, Hagisho, Ichinoseki, Iwate 021-8511, Japan Astronomical Institute, Tohoku University, Sendai, Miyagi 980-8578, Japan
L. Dobos
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
C. Filion
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
E. Kirby
Affiliation:
Department of Physics and Astronomy, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA
M. Chiba
Affiliation:
Astronomical Institute, Tohoku University, Sendai, Miyagi 980-8578, Japan
R. Wyse
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
*
email: khayashi@sendai-nct.ac.jp
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Abstract

The Galactic dwarf spheroidal galaxies (dSphs) provide valuable insight into dark matter (DM) properties and its role in galaxy formation. Their close proximity enables the measurement of line-of-sight velocities for resolved stars, which allows us to study DM halo structure. However, uncertainties in DM mass profile determination persist due to the degeneracy between DM mass density and velocity dispersion tensor anisotropy. Overcoming this requires large kinematic samples and identification of foreground contamination. With 1.25 deg2 and 2394 fibers, PFS plus pre-imaging with Hyper Suprime Cam will make significant progress in this undertaking.

Keywords

Dark matterDwarf spheroidal galaxiesGalaxy dynamicsLocal Group

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 181 - 186
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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