AAS 201st Meeting, January, 2003
Session 79. Intergalactic Material: Its Structure and Composition
Poster, Wednesday, January 8, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[79.05] Lyman Break Galaxies and the Lyman-alpha Forest

J.A. Kollmeier, D.H. Weinberg (Ohio State Univ.), R. Dave (U. Arizona), N. Katz (U. Massachusetts)

Using hydrodynamic cosmological simulations, we predict the correlations between Lya forest absorption in quasars and the presence of galaxies close to the line of sight. The predicted correlations on large scales are in qualitative agreement with observations, but the observations show decreased absorption in very close proximity to galaxies, which the simulations do not predict. We find that local photoionization by galaxies or the AGN within them cannot explain this observed decrease, and that any feedback mechanism must eliminate neutral hydrogen out to comoving distances of ~1 Mpc/h or more to reproduce the observations.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.