Abstract The conformity effect, indicating the evolution of galaxies is related to its surrounding neighbor galaxies as far as a few Mpc, is an interesting phenomenon in the modeling of galaxy and evolution. Here we study the conformity effect of HI galaxies in a matched galaxy sample between SDSS DR7 and ALFALFA surveys. By checking the probability difference for the detected H I galaxies as a function of distance around a normal or an H I galaxy, we find that this effect is significant out to 5 Mpc. It also shows a dependence on the stellar mass of galaxies, with the strength the strongest in the stellar mass range of 1010
Keywords method: data analysis — radio lines: galaxies — galaxies: evolution
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