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First detection of the 448 GHz H2O transition in space

AutorPereira-Santaella, M.; Martín Pintado, Jesús; Colina, Luis ; Alonso-Herrero, A. ; Arribas-Mocoroa, Santiago ; Cazzoli, S.; Storchi Bergmann, T.
Palabras claveGalaxies: ISM
Galaxies: nuclei
Infrared: galaxies
ISM: molecules
Fecha de publicación3-may-2017
EditorEDP Sciences
CitaciónAstronomy & Astrophysics 601(L3): 1-4 (2017)
ResumenWe present the first detection of the ortho-H2O 423 - 330 transition at 448 GHz in space. We observed this transition in the local (z = 0.010) luminous infrared (IR) galaxy ESO 320-G030 (IRAS F11506-3851) using the Atacama Large Millimeter/submillimeter Array (ALMA). The water 423 - 330 emission, which originates in the highly obscured nucleus of this galaxy, is spatially resolved over a region of ~65 pc in diameter and shows a regular rotation pattern compatible with the global molecular and ionized gas kinematics. The line profile is symmetric and well fitted by a Gaussian with an integrated flux of 37.0 ± 0.7 Jy km s-1. Models predict this water transition as a potential collisionally excited maser transition. On the contrary, in this galaxy, we find that the 423 - 330 emission is primarily excited by the intense far-IR radiation field present in its nucleus. According to our modeling, this transition is a probe of deeply buried galaxy nuclei thanks to the high dust optical depths (τ100μm> 1, NH> 1024 cm-2) required to efficiently excite it. © ESO, 2017.
DescripciónPereira-Santaella, M. et. al.
Versión del editorhttp://dx.doi.org/10.1051/0004-6361/201730851
URIhttp://hdl.handle.net/10261/151931
DOI10.1051/0004-6361/201730851
E-ISSN1432-0746
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