The density profile of Milky Way dark matter halo constrained from the OGLE microlensing sky map

We report the detection of a core with a size of 282 −31 +34 pc in the center of Milky Way dark matter halo at the 68% confidence level. It was detected using the microlensing event-rate sky map data from the optical gravitational lensing experiment (OGLE) survey. We applied the spatial information of the microlensing sky map and modeled it with the detailed Milky Way dark matter halo core-cusp profile, and with the fraction of dark matter in the form of mini dark matter structure (MDMS; f MDMS = Ω MDMS /Ω DM ) such as a primordial black hole, Earth-mass subhalos, or floating planets. This sky map can simultaneously constrain f MDMS and the core size without a strong degeneracy while fully considering the mass function of Milky Way stellar components from the bulge and disk.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-12-11
DOI
https://doi.org/10.1051/0004-6361/202452408
Citations
2
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
0.66

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article

The density profile of Milky Way dark matter halo constrained from the OGLE microlensing sky map

Steven Lin, L.‐W. Wei, Wentao Luo, Yi-Fu Cai et al.
2 citations
Astronomy and Astrophysics
Galaxies: Formation, Evolution, Phenomena
0.66
article

The density profile of Milky Way dark matter halo constrained from the OGLE microlensing sky map

Steven Lin, L.‐W. Wei, Wentao Luo, Yi-Fu Cai, Qi Li, A. Rodriguez, Chengyue Su, Bo Wang, Qi Guo
article en
2 citations

Abstract

We report the detection of a core with a size of 282 −31 +34 pc in the center of Milky Way dark matter halo at the 68% confidence level. It was detected using the microlensing event-rate sky map data from the optical gravitational lensing experiment (OGLE) survey. We applied the spatial information of the microlensing sky map and modeled it with the detailed Milky Way dark matter halo core-cusp profile, and with the fraction of dark matter in the form of mini dark matter structure (MDMS; f MDMS = Ω MDMS /Ω DM ) such as a primordial black hole, Earth-mass subhalos, or floating planets. This sky map can simultaneously constrain f MDMS and the core size without a strong degeneracy while fully considering the mass function of Milky Way stellar components from the bulge and disk.

Astronomy and AstrophysicsVol. 693
University of Science and Technology of China (CN), Sun Yat-sen University (CN), University of Utah (US), University of Michigan (US), Space Engineering University (CN)
National Natural Science Foundation of China, China Scholarship Council, University of Science and Technology of China, Higher Education Discipline Innovation Project
Openalex Percentile: Top 27%
Galaxies: Formation, Evolution, Phenomena
0.66
DOIOpen Access PDFOpenAlex
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The density profile of Milky Way dark matter halo constrained from the OGLE microlensing sky map — Steven Lin, L.‐W. Wei, et al. · Astronomy and Astrophysics (2024) | TGRS Research Map | TGRS