The dark matter content of Milky Way dwarf spheroidal galaxies: Draco, Sextans and Ursa Minor
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arXiv
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| Format: | Preprint |
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2025
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| author | Yang, Hao Wang, Wenting Zhu, Ling Li, Ting S. Koposov, Sergey E. Han, Jiaxin Li, Songting Shi, Rui Valluri, Monica Riley, Alexander H. Dey, Arjun Rockosi, Constance Palau, Carles G. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Cooper, Andrew de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Morales, Alma Xochitl Gonzalez Gutierrez, Gaston Guy, Julien Honscheid, Klaus Ishak, Mustapha Joyce, Dick Kehoe, Robert Kisner, Theodore Kizhuprakkat, Namitha Kremin, Anthony Lahav, Ofer Landriau, Martin Guillou, Laurent Le Medina, Gustavo E. Meisner, Aaron Miquel, Ramon Palanque-Delabrouille, Nathalie Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| author_facet | Yang, Hao Wang, Wenting Zhu, Ling Li, Ting S. Koposov, Sergey E. Han, Jiaxin Li, Songting Shi, Rui Valluri, Monica Riley, Alexander H. Dey, Arjun Rockosi, Constance Palau, Carles G. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Cooper, Andrew de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Morales, Alma Xochitl Gonzalez Gutierrez, Gaston Guy, Julien Honscheid, Klaus Ishak, Mustapha Joyce, Dick Kehoe, Robert Kisner, Theodore Kizhuprakkat, Namitha Kremin, Anthony Lahav, Ofer Landriau, Martin Guillou, Laurent Le Medina, Gustavo E. Meisner, Aaron Miquel, Ramon Palanque-Delabrouille, Nathalie Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| contents | The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans and Ursa Minor. Based on the observed line-of-sight velocities and metallicities of their member stars, we apply the axisymmetric Jeans Anisotropic Multi-Gaussian Expansion modeling (JAM) approach to recover their inner dark matter distributions. In particular, both the traditional single-population Jeans model and the multiple population chemodynamical model are adopted. With the chemodynamical model, we divide member stars of each dSph into metal-rich and metal-poor populations. The metal-rich populations are more centrally concentrated and dynamically colder, featuring lower velocity dispersion profiles than the metal-poor populations. We find a diversity of the inner density slopes $γ$ of dark matter halos, with the best constraints by single-population or chemodynamical models consistent with each other. The inner density slopes are $0.71^{+0.34}_{-0.35}$, $0.26^{+0.22}_{-0.12}$ and $0.33^{+0.20}_{-0.16}$ for Draco, Sextans and Ursa Minor, respectively. We also present the measured astrophysical J and D factors of the three dSphs. Our results indicate that the study of the dark matter content of dSphs through stellar kinematics is still subject to uncertainties behind both the methodology and the observed data, through comparisons with previous measurements and data sets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02284 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The dark matter content of Milky Way dwarf spheroidal galaxies: Draco, Sextans and Ursa Minor Yang, Hao Wang, Wenting Zhu, Ling Li, Ting S. Koposov, Sergey E. Han, Jiaxin Li, Songting Shi, Rui Valluri, Monica Riley, Alexander H. Dey, Arjun Rockosi, Constance Palau, Carles G. Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd Cooper, Andrew de la Macorra, Axel Doel, Peter Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Morales, Alma Xochitl Gonzalez Gutierrez, Gaston Guy, Julien Honscheid, Klaus Ishak, Mustapha Joyce, Dick Kehoe, Robert Kisner, Theodore Kizhuprakkat, Namitha Kremin, Anthony Lahav, Ofer Landriau, Martin Guillou, Laurent Le Medina, Gustavo E. Meisner, Aaron Miquel, Ramon Palanque-Delabrouille, Nathalie Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The Milky Way Survey of the Dark Energy Spectroscopic Instrument (DESI) has so far observed three classical dwarf spheroidal galaxies (dSphs): Draco, Sextans and Ursa Minor. Based on the observed line-of-sight velocities and metallicities of their member stars, we apply the axisymmetric Jeans Anisotropic Multi-Gaussian Expansion modeling (JAM) approach to recover their inner dark matter distributions. In particular, both the traditional single-population Jeans model and the multiple population chemodynamical model are adopted. With the chemodynamical model, we divide member stars of each dSph into metal-rich and metal-poor populations. The metal-rich populations are more centrally concentrated and dynamically colder, featuring lower velocity dispersion profiles than the metal-poor populations. We find a diversity of the inner density slopes $γ$ of dark matter halos, with the best constraints by single-population or chemodynamical models consistent with each other. The inner density slopes are $0.71^{+0.34}_{-0.35}$, $0.26^{+0.22}_{-0.12}$ and $0.33^{+0.20}_{-0.16}$ for Draco, Sextans and Ursa Minor, respectively. We also present the measured astrophysical J and D factors of the three dSphs. Our results indicate that the study of the dark matter content of dSphs through stellar kinematics is still subject to uncertainties behind both the methodology and the observed data, through comparisons with previous measurements and data sets. |
| title | The dark matter content of Milky Way dwarf spheroidal galaxies: Draco, Sextans and Ursa Minor |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2507.02284 |