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We investigate the role of environment on radio galaxy properties byconstructing a sample of large ($\gtrsim100$~kpc), nearby ($z<0.3$) radiosources identified as part of the Radio Galaxy Zoo citizen science project. Oursample consists of 16 Fanaroff-Riley Type II (FR-II) sources, 6 FR-I sources,and one source with a hybrid morphology. FR-I sources appear to be hosted bymore massive galaxies, consistent with previous studies. In the FR-II sample,we compare the degree of asymmetry in radio lobe properties to asymmetry in theradio source environment, quantified through optical galaxy clustering. We findthat the length of radio lobes in FR-II sources is anti-correlated with bothgalaxy clustering and lobe luminosity. These results are in quantitativeagreement with predictions from radio source dynamical models, and suggest thatgalaxy clustering provides a useful proxy for the ambient gas densitydistribution encountered by the radio lobes.

Radio Galaxy Zoo: Observational evidence for environment as the cause of radio source asymmetry