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    • Excited OH + , H 2 O + , and H 3 O + in NGC 4418 and Arp 220 

      González-Alfonso, Eduardo; Fischer, Jacqueline R.; Bruderer, Simon; Müller, Holger S.P.; Graciá-Carpio, Javier; Sturm, Eckhard; Lutz, Dieter; Poglitsch, Albrecht; Feuchtgruber, Helmut; Veilleux, Sylvain; Contursi, Alessandra; Sternberg, Amiel; Hailey-Dunsheath, Steven; Verma, Aprajita; Christopher, Natalie M.; Davies, Richard I.; Genzel, Reinhardt; Tacconi, Linda J. (2013-01-01)
      We report on Herschel/PACS observations of absorption lines of OH + , H 2 O + and H 3 O + in NGC 4418 and Arp 220. Excited lines of OH + and H 2 O + with E lower of at least 285 and ∼200 K, respectively, are detected in ...