Fig. 6

Channel maps of the 28Si18O v = 0 J = 6–5 line emission. The contours are at 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44 and 48 times the rms noise in the peak line channel (0.07 Jy beam-1). Every channel is 2.5 km s-1 wide and the central LSR velocity is indicated in the lower right corner of each box. The emission from the 28Si18O isotopologue is mostly compact and peaks on Source I (pink star), but displays also a low-brightness elongated structure in the northeast-southwest direction, indicating that the 28Si18O isotopologue traces the same outflow structures as the 28SiO v = 0 and 29SiO v = 0 lines. The diffuse and extended emission at larger velocities mostly originates from the hot core, south of Source I, and may be attributed to CH3CH2CN. The ALMA synthesized beam is indicated as a white ellipse in the lower left panel.
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