1. A $\sim$300 pc-sized core of Milky Way dark matter halo constrained from the OGLE micro-lensing sky map
- Author
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Lin, Shu-Rui, Luo, Wentao, Cai, Yi-Fu, Guo, Qi, Wei, Leyao, Wang, Bo, Li, Qinxun, Su, Can-Po, and Rodriguez, Alexander
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We report the detection of a 282 $^{+34}_{-31}$ pc-sized core in the center of Milky Way dark matter halo at $68\%$ confidence level by using the micro-lensing event rate sky map data from the Optical Gravitational Lensing Experiment (OGLE) survey. We apply the spacial information of the micro-lensing sky map and model it with the detailed Milky Way dark matter halo Core/Cusp profile, and the fraction of dark matter in the form of Mini Dark Matter Structure (MDMS, $f_{\rm MDMS}=\Omega_{\rm MDMS}/\Omega_{\rm DM}$), e.g. primordial black hole, earth-mass subhalos, floating planets and so on. We find that this sky map can constrain both $f_{\rm MDMS}$ and the core size simultaneously without strong degeneracy while fully considering mass function of Milky Way stellar components from both the bulge and disk., Comment: 6 pages, 2 figures, 1 table
- Published
- 2022