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**Session 94 - Large-Scale Structure: Observations and Theory.**

*Oral session, Wednesday, January 17*

*Corte Real, Hilton*

## [94.02] The 2D Power Spectrum of the Las Campanas Redshift Survey: Excess Power on 100 Mpc Scales

*S. D. Landy, S. A. Shectman (Carnegie Observatories), H. Lin, R. P. Kirshner (Harvard-Smithsonian CfA), A. A. Oemler (Yale U.), D. Tucker (Astrophysikalisches Institut Potsdam)*
We have measured the 2 dimensional (2D) power spectrum of the Las
Campanas Redshift Survey on scales between 30 and 200 Mpc
(q_0=0.5, H_o=100h km sec^-1 Mpc^-1). We find a strong peak in the power spectrum at \sim 100 Mpc
relative to the smooth continuum expected from the best fit Cold Dark Matter model (Prob \sim 2.5\times 10^-4 with Ømega h = 0.3 assuming a Gaussian random field). This signal is detected in two independent directions on the sky and has been identified with numerous structures visible in the survey which appear as walls and voids. Therefore, we conclude that there exists a significant increase in power on this scale and that such structures are common features in the local universe, z\leq 0.2.

**Program
listing for Wednesday**