The Effect Of AGN Heating On The Low-Redshift Lyα Forest

Abstract

We investigate the effects of AGN heating and the ultraviolet background on the low-redshift Lyman-$\alpha$ forest column density distribution (CDD) using the Illustris simulation. We show that Illustris reproduces observations at $z=0.1$ in the column density range $10^{12.5}-10^{13.5}$cm${}^{-2}$, relevant for the "photon underproduction crisis." We attribute this to the inclusion of AGN feedback, which changes the gas distribution so as to mimic the effect of extra photons, as well as the use of the Faucher-Giguère ultraviolet background, which is more ionizing at $z=0.1$ than the Haardt & Madau background previously considered. We show that the difference between simulations run with smoothed particle hydrodynamics and simulations using a moving mesh is small in this column density range but can be more significant at larger column densities. We further consider the effect of supernova feedback, Voigt profile fitting and finite resolution, all of which we show to have little influence on the CDD. Finally, we identify a discrepancy between our simulations and observations at column densities $10^{14}-10^{16}$cm${}^{-2}$, where Illustris produces too few absorbers, which suggests the AGN feedback model should be further refined. Since the "photon underproduction crisis" primarily affects lower column density systems, we conclude that AGN feedback and standard ionizing background models can resolve the crisis.

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• The effect of stellar and AGN feedback on the low redshift Lyman-$\alpha$ forest in the Sherwood simulation suite
• Limits on non-canonical heating and turbulence in the intergalactic medium from the low redshift Lyman-alpha forest
• Efficient long-range AGN feedback affects the low redshift Lyman-$\alpha$ forest
• The low redshift Lyman-$\alpha$ Forest as a constraint for models of AGN feedback
• The evolution of the low-density HI intergalactic medium from z=3.6 to 0: Data, transmitted flux and HI column density
• Probing the Dependence of the Intergalactic Medium on Large Scale Environment Using the Low Redshift Lyman Alpha Forest
• Possible evidence for a large-scale enhancement in the Lyman-$\alpha$ forest power spectrum at redshift $\text{z}\ge 4$
• Can the Low Redshift Lyman Alpha Forest Constrain AGN Feedback Models?
• Measuring the thermal and ionization state of the low-$z$ IGM using likelihood free inference
• X-ray Absorption Lines in the Warm-Hot Intergalactic Medium: Probing Chandra observations with the CAMEL simulations
• The Lyman-limit photon mean free path at the end of late reionisation in the Sherwood-Relics simulations
• Measurement of redshift-space two- and three-point correlation of Ly$\alpha$ absorbers at $1.7<z<3.5$: Implications on evolution of the physical properties of IGM