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On the Disappearanc...
On the Disappearance of a Cold Molecular Torus around the Low-luminosity Active Galactic Nucleus of NGC 1097
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- Izumi, T. (författare)
- National Astronomical Observatory of Japan
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- Kohno, K. (författare)
- University of Tokyo, Japan
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Fathi, K. (författare)
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- Hatziminaoglou, E. (författare)
- European Southern Observatory (ESO)
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- Davies, R. I. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Martin, S. (författare)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Matsushita, S. (författare)
- Academia Sinica Taiwan
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- Schinnerer, E. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Espada, D. (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Aalto, Susanne, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Onishi, K. (författare)
- Ehime University
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- Turner, J. L. (författare)
- University of California
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- Imanishi, M. (författare)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Nakanishi, K. (författare)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Meier, D. S. (författare)
- New Mexico Institute of Mining and Technology
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- Wada, K. (författare)
- Kagoshima University
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- Kawakatu, N. (författare)
- National Institute of Technology, Kure College
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- Nakajima, T. (författare)
- Nagoya University
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(creator_code:org_t)
- 2017-08-04
- 2017
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 845:1, s. L5-
- Relaterad länk:
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http://dx.doi.org/10...
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We used the Atacama Large Millimeter/Submillimeter Array to map the CO(3-2) and the underlying continuum emissions around the type-1low-luminosity active galactic nucleus (LLAGN; bolometric luminosity less than or similar to 10(42) erg. s(-1)) of NGC 1097 at similar to 10 pc resolution. These observations revealed a detailed cold gas distribution within a similar to 100 pc of this LLAGN. In contrast to the luminous Seyfert galaxy NGC 1068, where a similar to 7 pc cold molecular torus was recently revealed, a distinctively dense and compact torus is missing in our CO(3-2) integrated intensity map of NGC 1097. Based on the CO(3-2) flux, the gas mass of the torus of NGC 1097 would be a factor of greater than or similar to 2-3 less than that found for NGC 1068 by using the same CO-to-H-2 conversion factor, which implies less active nuclear star formation and/or inflows in NGC 1097. Our dynamical modeling of the CO(3-2) velocity field implies that the cold molecular gas is concentrated in a thin layer as compared to the hot gas traced by the 2.12 mu m H-2 emission in and around the torus. Furthermore, we suggest that NGC 1097 hosts a geometrically thinner torus than NGC 1068. Although the physical origin of the torus thickness remains unclear, our observations support a theoretical prediction that geometrically thick tori with high opacity will become deficient as AGNs evolve from luminous Seyferts to LLAGNs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: individual (NGC 1097)
- galaxies: Seyfert
- galaxies: ISM
- galaxies: active
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Izumi, T.
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Kohno, K.
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Fathi, K.
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Hatziminaoglou, ...
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Davies, R. I.
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Martin, S.
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visa fler...
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Matsushita, S.
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Schinnerer, E.
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Espada, D.
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Aalto, Susanne, ...
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Onishi, K.
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Turner, J. L.
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Imanishi, M.
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Nakanishi, K.
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Meier, D. S.
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Wada, K.
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Kawakatu, N.
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Nakajima, T.
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