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Fig. 4.

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Exponential surface density maps of the gaseous disk and the stellar disk in a non-perturbed halo potential and a perturbed halo potential, projected in the X − Y plane. (a) Exponential surface density map of the gaseous disk for a non-perturbed halo potential. (b) Exponential surface density map of the stellar disk for a non-perturbed halo potential. (c) Asymmetric gas surface density map associated with a lopsided (perturbed) halo potential model-cube (contours of constant surface density for an m = 1 perturbation in the potential). (d) Asymmetric stellar surface density map associated with a lopsided (perturbed) halo potential model cube. The exponential gaseous disk scale length is Rexp, gas = 1.04 kpc and the central surface density for the total gas (HI and He) disk is . The exponential stellar disk scale length Rexp, stellar = 1.24 kpc and the central surface density for stellar disk, . There is symmetry between two halves of gaseous disk surface density map in (a) and stellar disk surface density map in (b) in a non-perturbed halo potential and there is asymmetry between two halves of gaseous disk surface density map in (c) and stellar disk surface density map in (d) in a perturbed (lopsided) halo potential.

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