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We have used the visible integral-field replicable unit spectrographprototype (VIRUS-P), a new integral field spectrograph, to study the spatiallyand spectrally resolved Lyman-alpha emission line structure in the radio galaxyB2 0902+34 at z=3.4. We observe a halo of Lyman-alpha emission with a velocitydispersion of 250 km/s extending to a radius of 50 kpc. A second feature isrevealed in a spatially resolved region where the line profile showsblueshifted structure. This may be viewed as either HI absorption at -450 km/sor secondary emission at -900 km/s from the primary peak. Our new data, incombination with the 21 cm absorption, suggest two important and unexplaineddiscrepancies. First, nowhere in the line profiles of the Lyman-alpha halo isthe 21 cm absorber population evident. Second, the 21 cm absorption redshift ishigher than the Lyman-alpha emission redshift. In an effort to explain thesetwo traits, we have undertaken the first three dimensional Monte Carlosimulations of resonant scattering in radio galaxies. Though simple, the modelproduces the features in the Lyman-alpha data and predicts the 21 cmproperties. To reach agreement between this model and the data, global infallof the HI is strictly necessary. The amount of gas necessary to match the modeland data is surprisingly high, >= 10E12 solar masses, an order of magnitudelarger than the stellar mass. The collapsing structure and large gas mass leadus to interpret B2 0902+34 as a protogiant elliptical galaxy.

B2 0902+34: A Collapsing Protogiant Elliptical Galaxy at z=3.4