Characterizing High Mass-to-Light Ratio Dark Matter Sub-Halos in MUSIC II Galaxy Cluster Simulations

EasyChair Preprint no. 9539

Abstract

A single dark matter halo can hold various clumps of dark matter virialized by gravity bound together. With the aid of
ROCKSTAR halo finder algorithms, we identify the properties, distribution, and content within these multiple virialized
clumps of dark matter based on Marenostrum-MultiDark Galaxy Cluster Simulation (MUSIC). We are focusing on the
characteristics of the high mass-to-light ratio of dark matter subhalo with the help of ROCKSTAR halo finder in order to
know the important concepts of DM subhalos and their contents. We determine the mass-to-light ratio of DM subhalos
for cluster 281 within a radius of 15 kpc and 30 kpc and the minimum number of particles is 50 and 100, respectively.
We also compared its value for cluster 282 within a radius of 10 kpc and 30 kpc and the minimum number of particles are
1000 and 100, respectively. On both clusters we found that the high mass-to-light ratio is found in the smaller mass of
(1×10¹⁰M_Sun/h  - 10×10¹⁰M_Sun/h) of DM subhalos. We also analyzed the mass-to-light ratio of clusters at a radius of R to
R₂₀₀. So, the high mass-to-light ratio is found to be at a distance around 0.5×R₂₀₀ and the concentration of dark matter
subhalos is also high at this radius. We observed that the result from the graph can be interpreted simply as the high
mass-to-light ratio of dark matter subhalos is very rare to be found in the inner volume of clusters. And we conclude that
the distribution of the high mas-to-light ratio of dark matter subhalo peak at a distance of R∼ R₂₀₀. These may suggest
that the search for content of dark matter from subhalos in dark matter halo is most promising at a distance of R∼ R₂₀₀.

Keyphrases: dark matter, galaxy cluster, mass-to-light ratio, sub-halos

@Booklet{EasyChair:9539,
  author = {Murad Yimam and Remudin Reshid Mekuria},
  title = {Characterizing High Mass-to-Light Ratio Dark Matter Sub-Halos in MUSIC II Galaxy Cluster Simulations},
  howpublished = {EasyChair Preprint no. 9539},

  year = {EasyChair, 2023}}