Image decomposition of the [C II] line. Left and middle panels: 2D elliptical Sérsic model and the residual between the observed and modeled [C II] intensity maps. The shape of the [C II] synthesized beam with a FWHM size of is plotted in the bottom-left corner of each panel. We measured the residual rms to be 0.037 Jy beam⁻¹ km s⁻¹ inside the dashed gray square with a side length of 1″. Top-right panel: [C II] luminosity surface brightness (black squares and red diamonds with error bars are measurements from the observed intensity map and the 2D elliptical Sérsic model, respectively) at different radii, measured using elliptical rings with the ring width along the major axis half () that of the [C II] clean beam size, the rotation angle equal to (=199°), and the ratio of semiminor and semimajor axis – b/a of (), where and come from the [C II] line kinematic modeling. The error bar represents the standard deviation of the values of all pixels in each ring. The solid and dashed gray lines are three times the [C II] luminosity surface brightness limit measured in the emission-free region with an elliptical annulus that is the same with the ones used to measure the [C II] luminosity surface brightness but with a larger radius, and its corresponding rms. Bottom-right panel: luminosity surface brightness difference (red diamonds) between the measurements from the observed intensity map and the 2D elliptical Sérsic model. Note that the vertical scale is linear and in units of 10⁷ L_⊙ kpc⁻².