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Diagnosing feedback with the Lyman-alpha forest at z~0.1

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If you have a question about this talk, please contact Martin Haehnelt.

I will introduce a new set of state-of-the-art hydrodynamical simulations of the intergalactic medium—the Sherwood simulation suite—and compare them to a wide variety of Lyman-alpha forest observations obtained with ground and space based observatories. While the agreement between observational data and theory is excellent at z>2, significant differences remain at lower redshift, particularly for the Lyman-alpha forest at z~0.1 observed using the Cosmic Origins Spectrograph (COS) on the HST . I shall discuss the nature of this discrepancy, what it may imply about galactic feedback in the low redshift Universe, and advance some possible explanations for its resolution.

This talk is part of the Galaxies Discussion Group series.

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