The Lyalpha Forest Around High Redshift Galaxies

Abstract

Motivated by the relative lack of neutral hydrogen around Lyman Break Galaxies deduced from recent observations, we investigate the properties of the Lyalpha forest around high redshift galaxies. The study is based on improved numerical SPH simulations implementing, in addition to standard processes, a new scheme for multiphase and outflow physics description. Although on large scales our simulations reproduce a number of statistical properties of the IGM (because of the small filling factor of shock-heated gas), they underpredict the Lyalpha optical depth decrease inside 1 Mpc/h of the galaxies by a factor of ~2. We interpret this result as due to the combined effect of infall occurring along the filaments, which prevents efficient halo gas clearing by the outflow, and the insufficient increase of (collisional) hydrogen ionization produced by the temperature increase inside the hot, outflow-carved bubble. Unless an observational selection bias is present, we speculate that local photoionization could be the only viable explanation to solve the puzzle.

5 pages, 4 figures, submitted to MNRAS

References in corpus (19)

• GADGET: A code for collisionless and gasdynamical cosmological simulations
• Radiative Transfer in a Clumpy Universe: II. The Utraviolet Extragalactic Background
• Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
• A measurement by BOOMERANG of multiple peaks in the angular power spectrum of the cosmic microwave background
• Galaxies and Intergalactic Matter at Redshift z~3: Overview
• Lyman Continuum Emission from Galaxies at z~3.4
• The Opacity of the Lyman Alpha Forest and Implications for Omega_{baryon} and the Ionizing Background
• P3M-SPH simulations of the Lyman-alpha Forest
• The Cluster Abundance in Flat and Open Cosmologies
• The Observed Probability Distribution Function, Power Spectrum, and Correlation Function of the Transmitted Flux in the Lyman-alpha Forest
• Early Metal Enrichment of the Intergalactic Medium by Pregalactic Outflows
• Cosmological Parameter Extraction from the First Season of Observations with DASI
• The Distribution of Column Densities and b Values in the Lyman-Alpha Forest
• QSO Metal Absorption Systems at High Redshift and the Signature of Hierarchical Galaxy Formation
• Early Enrichment of the Intergalactic Medium and its Feedback on Galaxy Formation
• Galactic winds in the intergalactic medium
• Mixing Metals in the Early Universe
• The Lyman-alpha forest of a Lyman Break Galaxy: VLT Spectra of MS1512-cB58 at z=2.724
• Comparing Simulations and Observations of the Lyman-Alpha Forest I. Methodology

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