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Disentangling the C...
Disentangling the Circumnuclear Environs of Centaurus A. III. An Inner Molecular Ring, Nuclear Shocks, and the CO to Warm H-2 Interface
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- Espada, D. (författare)
- Atacama Large Millimeter-submillimeter Array (ALMA),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Matsushita, S. (författare)
- Academia Sinica Taiwan
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- Miura, R.E. (författare)
- National Astronomical Observatory of Japan
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- Israel, F.P. (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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- Neumayer, N. (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)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Henkel, C. (författare)
- King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Izumi, T. (författare)
- University of Tokyo, Japan
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- Iono, 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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- Ott, J. (författare)
- National Radio Astronomy Observatory Socorro
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- Peck, A.B. (författare)
- Gemini Observatory North
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- Quillen, A.C. (författare)
- University of Rochester
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- Kohno, K. (författare)
- University of Tokyo, Japan
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(creator_code:org_t)
- 2017-07-13
- 2017
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 843:2
- Relaterad länk:
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https://scholarlypub...
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We present the distribution and kinematics of the molecular gas in the circumnuclear disk (CND; 400 pc ×200 pc) of Centaurus A with resolutions of ∼5 pc (0.″3) and shed light onto the mechanism feeding the active galactic nucleus (AGN) using CO(3-2), HCO + (4-3), HCN(4-3), and CO(6-5) observations obtained with ALMA. Multiple filaments or streamers of tens to a hundred parsec scale exist within the CND, which form a ring-like structure with an unprojected diameter of 9″ ×6″ (162 pc ×108 pc) and a position angle P.A. ≃ 155°. Inside the nuclear ring, there are two leading and straight filamentary structures with lengths of about 30-60 pc at P.A. ≃ 120° on opposite sides of the AGN, with a rotational symmetry of 180° and steeper position-velocity diagrams, which are interpreted as nuclear shocks due to non-circular motions. Along the filaments, and unlike other nearby AGNs, several dense molecular clumps present low HCN/HCO + (4-3) ratios (≲0.5). The filaments abruptly end in the probed transitions at r ≃ 20 pc from the AGN, but previous near-IR H 2 (J = 1-0)S(1) maps show that they continue in an even warmer gas phase (T ∼ 1000 K), winding up in the form of nuclear spirals, and forming an inner ring structure with another set of symmetric filaments along the N-S direction and within r ≃ 10 pc. The molecular gas is governed primarily by non-circular motions, being the successive shock fronts at different scales where loss of angular momentum occurs, a mechanism that may feed efficiently powerful radio galaxies down to parsec scales.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- cD
- galaxies: elliptical and lenticular
- ISM: molecules
- galaxies: individual (NGC 5128)
- galaxies: structure
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
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Espada, D.
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Matsushita, S.
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Miura, R.E.
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Israel, F.P.
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Neumayer, N.
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Martin, S.
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Henkel, C.
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Izumi, T.
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Iono, D.
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Aalto, Susanne, ...
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Ott, J.
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Peck, A.B.
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Quillen, A.C.
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Kohno, K.
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