Kavli Affiliate: Jie Shan
| First 5 Authors: Qiao Wang, Qiao Wang, , ,
| Summary:
We present the Hyper Millennium (HM) simulation, an extremely large cosmological simulation designed to support next-generation galaxy surveys. The simulation follows 4.2 trillion dark matter particles in a comoving box of $2.5 h^-1rm Gpc$, with a mass resolution of $3.2 times 10^8, rm M_odot$ and a force resolution of $3.0 h^-1rm kpc$. Its combination of scale and resolution is ideal for studying large-scale structures and rare cosmic objects. In this first paper of the HM project, we explore whether the massive galaxy cluster Abell 2744 (A2744) can be reproduced in detail in the simulation. Pixel-based statistics of galaxy number density $N_rm gal$, luminosity density $L_rm gal$, and projected mass density $κ$ show excellent agreement between A2744 and its analogues down to $sim 50 rm kpc$, once field-selection biases toward high galaxy surface density are accounted for. This concordance, achieved in one of the most extreme known galaxy environments, is a validation of the underlying $Λrm CDM$ model in the extreme regime of A2744 and showcases the robustness and accuracy of the HM simulation, which is capable of producing galaxy and mass catalogues of comparable quality out to high redshift across its full comoving volume of $45$ $rm Gpc^3$.
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