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We investigate the clustering properties and close neighbour counts forgalaxies with different types of bulges and stellar masses. We select samplesof "classical" and "pseudo" bulges, as well as "bulge-less" disk galaxies,based on the bulge/disk decomposition catalog of SDSS galaxies provided bySimard et al. (2011). For a given galaxy sample we estimate: the projectedtwo-point cross-correlation function with respect to a spectroscopic referencesample, w_p(r_p), and the average background-subtracted neighbour count withina projected separation using a photometric reference sample, N_neighbour(<r_p).We compare the results with the measurements of control samples matched incolor, concentration and redshift. We find that, when limited to a certainstellar mass range and matched in color and concentration, all the samplespresent similar clustering amplitudes and neighbour counts on scales above~0.1h^{-1}Mpc. This indicates that neither the presence of a central bulge, northe bulge type is related to intermediate-to-large scale environments. Onsmaller scales, in contrast, pseudo-bulge and pure-disk galaxies similarly showstrong excess in close neighbour count when compared to control galaxies, atall masses probed. For classical bulges, small-scale excess is also observedbut only for M_stars < 10^{10} M_sun; at higher masses, their neighbour countsare similar to that of control galaxies at all scales. These results implystrong connections between galactic bulges and galaxy-galaxy interactions inthe local Universe, although it is unclear how they are physically linked inthe current theory of galaxy formation.

The clustering of galaxies with pseudo bulge and classical bulge in the local Universe