Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220

We report on Herschel/PACS observations of absorption lines of OH +, H2O+ and H3O+ in NGC 4418 and Arp 220. Excited lines of OH+ and H2O+ with Elower of at least 285 and ∼200 K, respectively, are detected in both sources, indicating radiative pumping and location in the high radiation density enviro...

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Bibliographic Details
Main Authors:	Gonzalez-Alfonso, E, Fischer, J, Bruderer, S, Mueller, H, Gracia-Carpio, J, Sturm, E, Lutz, D, Poglitsch, A, Feuchtgruber, H, Veilleux, S, Contursi, A, Sternberg, A, Hailey-Dunsheath, S, Verma, A, Christopher, N, Davies, R, Genzel, R, Tacconi, L
Format:	Journal article
Language:	English
Published:	2013

Excited OH+, H2O+, and H3O+ in NGC 4418 and Arp 220

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