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  Counter-rotation and high-velocity outflow in the parsec-scale molecular torus of NGC 1068

Impellizzeri, C. M. V., Gallimore, J. F., Baum, S. A., Elitzur, M., Davies, R., Lutz, D., et al. (2019). Counter-rotation and high-velocity outflow in the parsec-scale molecular torus of NGC 1068. The Astrophysical Journal Letters, 884(2): L28. doi:10.3847/2041-8213/ab3c64.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-5E62-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-5E63-2
Genre: Journal Article

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 Creators:
Impellizzeri, C. M. Violette, Author
Gallimore, Jack F., Author
Baum, Stefi A., Author
Elitzur, Moshe, Author
Davies, Richard1, Author              
Lutz, Dieter1, Author              
Maiolino, Roberto, Author
Marconi, Alessandro, Author
Nikutta, Robert, Author
O’Dea, Christopher P., Author
Sani, Eleonora, Author
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1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We present 1.4 pc resolution observations of 256 GHz nuclear radio continuum and HCN (J = 3 → 2) in the molecular torus of NGC 1068. The integrated radio continuum emission has a flat spectrum consistent with free–free emission and resolves into an X-shaped structure resembling an edge-brightened bicone. HCN is detected in absorption against the continuum, and the absorption spectrum shows a pronounced blue wing that suggests a high-velocity molecular outflow with speeds reaching 450 km s−1. Analysis of the off-nucleus emission line kinematics and morphology reveals two nested, rotating disk components. The inner disk, inside r ~ 1.2 pc, has kinematics that are consistent with the nearly edge-on, geometrically thin H2O megamaser disk in Keplerian rotation around a central mass of 1.66 × 107 M . The outer disk, which extends to ~7 pc radius, counter-rotates relative to the inner disk. The rotation curve of the outer disk is consistent with rotation around the same central mass as the megamaser disk but in the opposite sense. The morphology of the molecular gas is asymmetric around the nuclear continuum source. We speculate that the outer disk formed from more recently introduced molecular gas falling out of the host galaxy or from a captured dwarf satellite galaxy. In NGC 1068, we find direct evidence that the molecular torus consists of counter-rotating and misaligned disks on parsec scales.

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 Dates: 2019-10-14
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/2041-8213/ab3c64
Other: LOCALID: 3230062
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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 884 (2) Sequence Number: L28 Start / End Page: - Identifier: ISSN: 2041-8205
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215