Baryonic Imprints on DM Halos: The concentration-mass relation in the CAMELS simulations

Abstract

The physics of baryons in halos, and their subsequent influence on the total matter phase space, has a rich phenomenology and must be well understood in order to pursue a vast set of questions in both cosmology and astrophysics. We use the CAMELS simulation suite to quantify the impact of four different galaxy formation parameters/processes (as well as two cosmological parameters) on the concentration-mass relation, $c_{\mathrm{vir}}-M_{\mathrm{vir}}$. We construct a simulation-informed nonlinear model for concentration as a function of halo mass, redshift, and 6 cosmological/astrophysical parameters. This is done for two galaxy formation models, IllustrisTNG and SIMBA, using 1000 simulations of each. We extract the imprints of galaxy formation across a wide range in mass $M_{\mathrm{vir}}\in [10^{11},10^{14.5}]M_{\odot }/h$ and in redshift $z\in [0,6]$ finding many strong mass- and redshift-dependent features. Comparisons between the IllustrisTNG and SIMBA results show the astrophysical model choices cause significant differences in the mass and redshift dependence of these baryon imprints. Finally, we use existing observational measurements of $c_{\mathrm{vir}}-M_{\mathrm{vir}}$ to provide rough limits on the four astrophysical parameters. Our nonlinear model is made publicly available and can be used to include CAMELS-based baryon imprints in any halo model-based analysis.

arXiv comment[v1]: 8 figures, 14 pages [v2]: version accepted in MNRAS

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