Search for gas emission around galaxies. Top panel: Line emission components of the system. Background image and gray contours represent the total CO(4−3) and CO(9−8) intensity map, respectively. These are obtained within Δv_QSO = [ − 700; +400] km s⁻¹. The red and blue contours on the quasar host galaxy show residual line maps after subtracting from the CO(4−3) total flux map, the blueshifted [ − 900, −300] km s⁻¹, and the systemic [ − 300, +400] km s⁻¹ image component, respectively. The contours correspond to [3, 2n]σ, with n > 1 is an integer number, and σ denotes the noise RMS. The contours on the MQN01-QC shows instead the isovelocity curves (blue: [ − 500, −350] km s⁻¹; white: [ − 300, −150] km s⁻¹; red: [ − 100, 50] km s⁻¹). The synthesized beam of the band 6 and 3 observations are reported with the gray hatched and filled ellipse at the bottom right corner, respectively. Bottom panel: PVD extracted along the black ($0\stackrel{″}{.}6$-wide), and the gray ($0\stackrel{″}{.}15$-wide) slit, for the band 3 and 6 datacube, respectively (see top panel). The background image and the gray contours report the continuum-subtracted band 3 and 6 data, respectively. The resolution of the each dataset is show with rectangles at the bottom right corner. The dotted dashed and solid contours represent 1σ, 2σ and 2nσ level, respectively.