Fig. 4: ALMA CO(6-5) observations of W0410-0913 show that its molecular ISM is structured in a rotationally-supported fast-rotating disk.

In panel a we show the moment-0 (velocity-integrated intensity), in panel b the moment-1 (velocity field), and in panel c the moment 2 (velocity dispersion field). The black solid line in the lower-left corner of the moment-0 panel shows a 5 kpc physical scale. The solid line in the moment-1 represents the kinematic major axis, while the dashed line represents the minor axis. The black contours in the moment-0 represent the ±[2, 4, 8,16, 32]σ levels emission, where σ = 3.3 × 10⁻² Jy beam⁻¹ km s⁻¹ is the root mean square (rms) of the velocity-integrated CO(6-5) flux map. The ALMA beam, colored in red, is shown in the lower-left corners. We also show, as a function of radius, the profiles of rotational velocity (blue squares and lines) and velocity dispersion (red squares and lines) in panel d and the profile of their ratio (green squares and lines) in panel e. The error bars represent the standard deviation derived by the model. The dotted (dashed) black line in the lower panel indicates the average (median) value of v_rot/σ.