Fig. 5.

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Arp 220 outflow regions. (a): Composite view of the isolated outflow regions: southeast outflow (red), hour-glass outflow (blue), northwest outflow (green). (b): Channel map between −650 and −300 km s−1 in the H2 transition with respect to the systemic redshift of the E nucleus. The white curve indicates the edges of the SEO mask. (c): Sum of channel maps < − 200 and > 200 km s−1 in the H2 transition with respect to the systemic redshift of the W nucleus. The white curve indicates the edges of the HG region. (d): Sum of H2 and Paα channel maps between −800 and −450 km s−1 with respect to the systemic redshift of the E nucleus. The white curve indicates the edges of the NWB region.
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