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Revisiting mass estimates of the Milky Way

Published online by Cambridge University Press:  30 October 2025

Yongjun Jiao Open the ORCID record for Yongjun Jiao [Opens in a new window] ,
François Hammer ,
Haifeng Wang Open the ORCID record for Haifeng Wang [Opens in a new window] ,
Jianling Wang Open the ORCID record for Jianling Wang [Opens in a new window]  and
Yanbin Yang Open the ORCID record for Yanbin Yang [Opens in a new window]
Yongjun Jiao*
Affiliation:
GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, 92195 Meudon, France
François Hammer
Affiliation:
GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, 92195 Meudon, France
Haifeng Wang
Affiliation:
CREF, Centro Ricerche Enrico Fermi, Via Panisperna 89A, I-00184 Roma, Italy
Jianling Wang
Affiliation:
GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, 92195 Meudon, France CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Beijing 100101, China
Yanbin Yang
Affiliation:
GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, 92195 Meudon, France
*
email: yongjun.jiao@obspm.fr
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Abstract

We use the rotation curve from Gaia data release (DR) 3 to estimate the mass of the Milky Way. We consider an Einasto density profile to model the dark matter component. We extrapolate and obtain a dynamical mass at 112 kpc. This lower-mass Milky Way is consistent with the significant declining rotation curve, and can provide new insights into our Galaxy and halo inhabitants.

Keywords

Galaxy: kinematics and dynamicsGalaxy:structuredark mattermethods: numerical

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 116 - 119
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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