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Unformatted text preview: permission of the AAS), which also generated very convincing absorption profiles and statistics. Renyue Cen has an extensive set of simulations available on the Web . As an example, here is a typical perspective view of the H I density in a 25-Mpc comoving cube at z =4 (courtesy of Cen, who gave permission for book usage ). Radio jets and lobes: the existence and structure of radio sources requires some external medium providing a counterpressure, else they would freely expand and become rapidly invisible. General stability and structure considerations allow some limits to be placed on the surrounding medium. Early work includes Rosen and Wiita (1988 ApJ 330, 16); a fuller treatment has been done by Hardee et al. (1992 ApJ 387, 460), with more rapid progress now possible....
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