Composite image showing (in green) the 3.6 cm radio continuum emission from warm ionized gas in the Sgr A West H ii region, with the three-arm Minispiral emerging very clearly, and (in red) the 3.4 mm HCN J = 1 → 0 line emission from the surrounding circumnuclear ring (CNR). The radio continuum data are from Yusef-Zadeh et al. (2008) and the HCN data from Wright et al. (2001). Figure credit: Farhad Yusef-Zadeh.
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