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The Galaxy Proximity Effect in the Lyman-alpha Forest | | Juna A. Kollmeier
; David H. Weinberg
; Romeel Dave’
; Neal Katz
; | | Date: |
17 Dec 2002 | | Journal: | AIP Conf.Proc. 666 (2003) 191-194 | | Subject: | astro-ph | | Affiliation: | Ohio State University, University of Arizona, University of Massachusetts | | Abstract: | Hydrodynamic cosmological simulations predict that the average opacity of the Ly-alpha forest should increase in the neighborhood of galaxies because galaxies form in dense environments. Recent observations (Adelberger et al. 2002) confirm this expectation at large scales, but they show a decrease of absorption at comoving separations Delta_r <~ 1 Mpc/h. We show that this discrepancy is statistically significant, especially for the innermost data point at Delta_r <= 0.5 Mpc/h, even though this data point rests on three galaxy-quasar pairs. Galaxy redshift errors of the expected magnitude are insufficient to resolve the conflict. Peculiar velocities allow gas at comoving distances >~ 1 Mpc/h to produce saturated absorption at the galaxy redshift, putting stringent requirements on any ``feedback’’ solution. Local photoionization is insufficient, even if we allow for recurrent AGN activity that keeps the neutral hydrogen fraction below its equilibrium value. A simple ``wind’’ model that eliminates all neutral hydrogen in spheres around the observed galaxies can marginally explain the data, but only if the winds extend to comoving radii ~1.5 Mpc/h. | | Source: | arXiv, astro-ph/0212355 | | Services: | Forum | Review | PDF | Favorites | |
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