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We have used the Sloan Digital Sky Survey (SDSS) to undertake aninvestigation of lopsidedness in a sample of ~25,000 nearby galaxies (z <0.06). We use the m=1 azimuthal Fourier mode between the 50% and 90% lightradii as our measure of lopsidedness. The SDSS spectra are used to measure theproperties of the stars, gas, and black hole in the central-most few-kpc-scaleregion. We show that there is a strong link between lopsidedness in the outerparts of the galactic disk and the youth of the stellar population in thecentral region. This link is independent of the other structural properties ofthe galaxy. These results provide a robust statistical characterization of theconnections between accretion/interactions/mergers and the resulting starformation. We also show that residuals in the galaxy mass-metallicity relationcorrelate with lopsidedness (at fixed mass, the more metal-poor galaxies aremore lopsided). This suggests that the events causing lopsidedness and enhancedstar formation deliver lower metallicity gas into the galaxy's central region.Finally, we find that there is a trend for the more powerful active galacticnuclei to be hosted by more lopsided galaxies (at fixed galaxy mass, density,or concentration). However if we compare samples matched to have both the samestructures and central stellar populations, we then find no difference inlopsidedness between active and non-active galaxies. This leads to thefollowing picture. The presence of cold gas in the central region of a galaxy(irrespective of its origin) is essential for both star-formation and blackhole growth. The delivery of cold gas is aided by the processes that producelopsidedness. Other processes on scales smaller than we can probe with our dataare required to transport the gas to the black hole.

The Lopsidedness of Present-Day Galaxies: Connections to the Formation of Stars, the Chemical Evolution of Galaxies, and the Growth of Black Holes