The circumgalactic medium of high redshift galaxies

Abstract

We study the properties of the circumgalactic medium (CGM) of high-$z$ galaxies in the metal enrichment simulations presented in Pallottini et al. 2014. At $z=4$, we find that the simulated CGM gas density profiles are self-similar, once scaled with the virial radius of the parent dark matter halo. We also find a simple analytical expression relating the neutral hydrogen equivalent width (${\mathrm{EW}}_{\mathrm{HI}}$) of CGM absorbers as a function of the line of sight impact parameter ($b$). We test our predictions against mock spectra extracted from the simulations, and show that the model reproduces the ${\mathrm{EW}}_{\mathrm{HI}}(b)$ profile extracted from the synthetic spectra analysis. When compared with available data, our CGM model nicely predicts the observed ${\mathrm{EW}}_{\mathrm{HI}}(b)$ in $z\lesssim 2$ galaxies, and supports the idea that the CGM profile does not evolve with redshift.

arXiv comment5 pages, 4 figures, accepted for publication in MNRAS Letters

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