ALMA CO(1-0) data for NGC 4418. Top left: moment-zero map. Overplotted are contours for the ranges [−930, −570] km s−1 (white, this range is dominated by emission of nitrogen sulfide), [−330, −190] km s−1 (blue, blue wing of CO, [0.8, 1.6] mJy beam−1) and [230, 510] km s−1 (red, nitrogen sulfide NS superposed on red wing of CO, [0.6, 1.2, 2.4] mJy beam−1). Top right: spectrum centered on the continuum nucleus. Before fitting, we have subtracted emission from nitrogen sulfide (blue) as described in the text, to obtain the black histogram CO(1-0) spectrum. CO outflow wings remain present in the line profile after subtraction of nitrogen sulfide. Nitrogen sulfide emission is still present in the other panels of this figure. The CO spectrum is decomposed into four Gaussians, three for the host line profile and one for outflow (green). The black line includes all four Gaussian components. Center left: center positions and their errors, from UV fitting a Gaussian model to individual velocity channels. The dotted line indicates the orientation of the major axis of the large scale disk of NGC 4418, according to 2MASS. Center and bottom right: position-velocity diagrams. PA −35° is orthogonal to the host galaxy’s major axis PA +55°. No outflow orientation is firmly established given signal-to-noise and contamination by NS, but the lesser contaminated blue wing may prefer outflow orthogonal to the disk.
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