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ALMA 002 Resolution...
ALMA 002 Resolution Observations Reveal HCN-abundance-enhanced Counter-rotating and Outflowing Dense Molecular Gas at the NGC 1068 Nucleus
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- Imanishi, Masatoshi (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences (NINS)
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- Nguyen, Dieu D. (författare)
- National Institutes of Natural Sciences (NINS)
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- Wada, Keiichi (författare)
- Kagoshima University,Hokkaido University,Ehime University
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- Hagiwara, Yoshiaki (författare)
- Toyo University
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- Iguchi, Satoru (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences (NINS)
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- Izumi, Takuma (författare)
- National Institutes of Natural Sciences (NINS),The Graduate University for Advanced Studies (SOKENDAI)
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- Kawakatu, Nozomu (författare)
- National Institute of Technology, Kure College
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- Nakanishi, Kouichiro (författare)
- National Institutes of Natural Sciences (NINS),The Graduate University for Advanced Studies (SOKENDAI)
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- Onishi, Kyoko, 1989 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2020-10-15
- 2020
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 902:2
- Relaterad länk:
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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
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- We present ALMA similar to 002 resolution observations of the nucleus of the nearby (similar to 14 Mpc) type 2 active galactic nucleus NGC 1068 at HCN/HCO+/HNCJ = 3-2 lines, as well as at their(13)C isotopologue and vibrationally excited lines, to scrutinize the morphological, dynamical, chemical, and physical properties of dense molecular gas in the putative dusty molecular torus around a mass-accreting supermassive black hole. We confirm almost east-west-oriented dense molecular gas emission both morphologically and dynamically, which we regard as coming from the torus. Bright emission is compact (less than or similar to 3 pc), and low-surface-brightness emission extends out to 5-7 pc. These dense molecular gas properties are not symmetric between the eastern and western torus. The HCNJ = 3-2 emission is stronger than the HCO(+)J = 3-2 emission within the similar to 7 pc torus region, with an estimated dense molecular mass of (0.4-1.0) x 10(6)M. We interpret that HCN abundance is enhanced in the torus. We detect signatures of outflowing dense molecular gas and a vibrationally excited HCNJ = 3-2 line. Finally, we find that in the innermost (less than or similar to 1 pc) part of the torus, the dense molecular line rotation velocity, relative to the systemic velocity, is the opposite of that in the outer (greater than or similar to 2 pc) part, in both the eastern and western torus. We prefer a scenario of counter-rotating dense molecular gas with innermost almost Keplerian rotation and outer slowly rotating (far below Keplerian) components. Our high-spatial-resolution dense molecular line data reveal that torus properties of NGC 1068 are much more complicated than the simple axisymmetrically rotating torus picture in the classical active galactic nucleus unification paradigm.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Nyckelord
- Molecular gas
- Seyfert galaxies
- Radio interferometry
- Millimeter astronomy
- Supermassive black holes
- Active galactic nuclei
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Imanishi, Masato ...
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Nguyen, Dieu D.
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Wada, Keiichi
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Hagiwara, Yoshia ...
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Iguchi, Satoru
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Izumi, Takuma
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Kawakatu, Nozomu
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Nakanishi, Kouic ...
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Onishi, Kyoko, 1 ...
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