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We show that redshift-space distortions of galaxy correlations have a strongeffect on correlation functions with distinct, localized features, like thesignature of the baryon acoustic oscillations (BAO). Near the line of sight,the features become sharper as a result of redshift-space distortions. Wedemonstrate this effect by measuring the correlation function in Gaussiansimulations and the Millennium Simulation. We also analyze the SDSS DR7main-galaxy sample (MGS), splitting the sample into slices 2.5 degrees on thesky in various rotations. Measuring 2D correlation functions in each slice, wedo see a sharp bump along the line of sight. Using Mexican-hat wavelets, welocalize it to (110 +/- 10) Mpc/h. Averaging only along the line of sight, weestimate its significance at a particular wavelet scale and location at 2.2sigma. In a flat angular weighting in the (pi,r_p) coordinate system, the noiselevel is suppressed, pushing the bump's significance to 4 sigma. We estimatethat there is about a 0.2% chance of getting such a signal anywhere in thevicinity of the BAO scale from a power spectrum lacking a BAO feature. However,these estimates of the significances make some use of idealized Gaussiansimulations, and thus are likely a bit optimistic.

Redshift-Space Enhancement of Line-of-Sight Baryon Acoustic Oscillations in the SDSS Main-Galaxy Sample