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.

5 pages, 4 figures, accepted for publication in MNRAS Letters

References in corpus (5)

• Simulating cosmic metal enrichment by the first galaxies
• Glimpsing through the high redshift neutral hydrogen fog
• Signatures of reionization on Lyman alpha emitters
• Testing Reionization with Gamma Ray Burst Absorption Spectra
• Large-scale environment of z~5.7 CIV absorption systems I: projected distribution of galaxies

Cited by in corpus (8)

• The ALPINE-ALMA [CII] survey: Star-formation-driven outflows and circumgalactic enrichment in the early Universe
• Deep into the structure of the first galaxies: SERRA views
• Zooming on the internal structure of $z\simeq 6$ galaxies
• The impact of chemistry on the structure of high-z galaxies
• Galactic outflow and diffuse gas properties at z>=1 using different baryonic feedback models
• The stellar populations of high-redshift dwarf galaxies
• On the relation between Lya absorbers and local galaxy filaments
• The effects of binary stars on galaxies and metal-enriched gas during reionization