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The environmental dependence of galaxy clustering encodes information aboutthe physical processes governing the growth of cosmic structure. We analyze thebaryon acoustic peak as a function of environment in the galaxy correlationfunction of the Baryon Oscillation Spectroscopic Survey CMASS sample. Dividingthe sample into three subsets by smoothed local overdensity, we detect acousticpeaks in the six separate auto-correlation and cross-correlation functions ofthe sub-samples. Fitting models to these correlation functions, calibrated bymock galaxy and dark matter catalogues, we find that the inferred distancescale is independent of environment, and consistent with the result ofanalyzing the combined sample. The shape of the baryon acoustic feature, andthe accuracy of density-field reconstruction in the Zeldovich approximation,varies with environment. By up-weighting underdense regions and down-weightingoverdense regions in their contribution to the full-sample correlationfunction, by up to 50%, we achieve a fractional improvement of a few per centin the precision of baryon acoustic oscillation fits to the CMASS data and mockcatalogues: the scatter in the preferred-scale fits to the ensemble of mocksimproves from 1.45% to 1.34% (pre-reconstruction) and 1.03% to 1.00%(post-reconstruction). These results are consistent with the notion that theacoustic peak is sharper in underdense environments.

The environmental dependence of the baryon acoustic peak in the Baryon Oscillation Spectroscopic Survey CMASS sample