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Title

High-resolution imaging of the molecular outflows in two mergers: IRAS 17208-0014 and NGC 1614

AuthorsGarcía-Burillo, S.; Usero, Antonio; Colina, Luis ; Alonso-Herrero, A. ; Costagliola, Francesco ; Pereira-Santaella, Miguel ; Arribas-Mocoroa, Santiago
KeywordsGalaxies: kinematics and dynamics
Galaxies: nuclei
Galaxies: individual: NGC1614
Galaxies: starburst
Galaxies: individual: IRAS 17208-0014
Galaxies: ISM
Issue Date2015
PublisherEDP Sciences
CitationAstronomy and Astrophysics 580: A35 (2015)
Abstract[Context]: Galaxy evolution scenarios predict that the feedback of star formation and nuclear activity (AGN) can drive the transformation of gas-rich spiral mergers into (ultra) luminous infrared galaxies and, eventually, lead to the build-up of QSO/elliptical hosts. [Aims]: We study the role that star formation and AGN feedback have in launching and maintaining the molecular outflows in two starburst-dominated advanced mergers, NGC 1614 (DL = 66 Mpc) and IRAS 17208-0014 (DL = 181 Mpc), by analyzing the distribution and kinematics of their molecular gas reservoirs. Both galaxies present evidence of outflows in other phases of their ISM. [Methods]: We used the Plateau de Bure interferometer (PdBI) to image the CO(10) and CO(21) line emissions in NGC 1614 and IRAS 17208-0014, respectively, with high spatial resolution (0: 0051: 002). The velocity fields of the gas were analyzed and modeled to find the evidence of molecular outflows in these sources and characterize the mass, momentum, and energy of these components. [Results]: While most (95%) of the CO emission stems from spatially resolved (23 kpc-diameter) rotating disks, we also detect in both mergers the emission from high-velocity line wings that extend up to -500-700 km s1, well beyond the estimated virial range associated with rotation and turbulence. The kinematic major axis of the line-wing emission is tilted by 90 in NGC 1614 and by 180 in IRAS 17208-0014 relative to the major axes of their respective rotating disks. These results can be explained by the existence of non-coplanar molecular outflows in both systems: the outflow axis is nearly perpendicular to the rotating disk in NGC 1614, but it is tilted relative to the angular momentum axis of the rotating disk in IRAS 17208-0014. [Conclusions]: In stark contrast to NGC 1614, where star formation alone can drive its molecular outflow, the mass, energy, and momentum budget requirements of the molecular outflow in IRAS 17208-0014 can be best accounted for by the existence of a so far undetected (hidden) AGN of LAGN71011 L The geometry of the molecular outflow in IRAS 17208-0014 suggests that the outflow is launched by a non-coplanar disk that may be associated with a buried AGN in the western nucleus.
DescriptionBased on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).-- et al.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201526133
URIhttp://hdl.handle.net/10261/140013
DOI10.1051/0004-6361/201526133
Identifiersdoi: 10.1051/0004-6361/201526133
e-issn: 1432-0746
issn: 0004-6361
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