The local environmental dependence of galaxy properties in the   volume-limited sample of Main Galaxies from the SDSS Data Release 5
  Using a volume-limited sample of Main Galaxies from the SDSS Data Release 5, we investigate the dependence of galaxy properties on local environment. For each galaxy, the local three-dimensional density is calculated. We find that galaxy morphologies strongly depend on local environment: galaxies in dense environments have predominantly early type morphologies, but other galaxy properties do not present significant dependence on local environment. Clearly, this puts a important constraint on proposed physical mechanisms. 
Xin-Fa Deng, Ji-Zhou He, Qun Zhang, Cong-Gen He, Peng Jiang, Yong Xin