The Nature and Abundance of Ly-alpha Clouds in Voids

Details The Nature and Abundance of Ly-alpha Clouds in Voids The Nature and Abundance of Ly-alpha Clouds in Voids

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..259m&link_type=abstract

The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb

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I devise a method to separate low-z Ly-alpha absorbers into void, and non-void clouds. The strong difference between void and non-void EW distribution functions enables a phenomenological definition of voids. I find the filling fraction of voids in the universe is fV = 0.86 -0.11+0.05, greater than voids defined by galaxies (fV <~ 0.5). I show that they cannot be explained as diffuse and expanding with the Hubble flow. Instead I model clouds as based on subgalactic halos whose baryons expand following reionization. Results of modeling show that only isothermal massive halos produce absorbers consistent with observations; NFW halos are not massive enough to restrain the evaporation of baryons, and produce no detectable absorption systems. A halo velocity distribution with slope parameter alpha=-1.95, and normalized to phiV* = 0.05 phi* can explain the observed distribution of void clouds.

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