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The distribution of the gas velocity dispersion sigma across the images of1146 MaNGA galaxies is analyzed. We find that there are two types ofdistribution of the gas velocity dispersion across the images of galaxies: (i)the distributions of 909 galaxies show a radial symmetry with or without thesigma enhancement at the center (R distribution) and (ii) distributions with aband of enhanced sigma along the minor axis in the images of 159 galaxies withor without the sigma enhancement at the center (B distribution) The sigmadistribution across the images of 78 galaxies cannot be reliable classified. Weselect 806 galaxies with the best defined characteristics (this sample includes687 galaxies with R distribution and 119 galaxies with B distribution) andcompare the properties of galaxies with R and B distributions. We find that themedian value of the gas velocity dispersion sigma_m in galaxies with Bdistribution is higher by around 5 km/s, on average, than that of galaxies withR distribution. The optical radius R_25 of galaxies with B distribution islower by around 0.1 dex, on average, than that of galaxies with similar masseswith R distribution. Thus the properties of a galaxy are related to the type ofdistribution of the gas velocity dispersion across its image. This suggeststhat the presence of the band of the enhanced gas velocity dispersion can be anindicator of a specific evolution (or a specific stage in the evolution) of agalaxy.

Two types of distribution of the gas velocity dispersion of MaNGA galaxies