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The hidden heart of...
The hidden heart of the luminous infrared galaxy IC 860: I. A molecular inflow feeding opaque, extreme nuclear activity
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- König, Sabine, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Falstad, Niklas, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mangum, J. G. (author)
- National Radio Astronomy Observatory
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- Sakamoto, K. (author)
- Academia Sinica Taiwan
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- Privon, G. (author)
- University of Florida
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- Gallagher III, J. S. (author)
- University of Wisconsin Madison
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- Combes, F. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Martin, S. (author)
- European Southern Observatory Santiago
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- Viti, Serena (author)
- University College London (UCL)
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Evans, A. S. (author)
- National Radio Astronomy Observatory,University of Virginia
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Varenius, Eskil, 1986 (author)
- University of Manchester
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- Beswick, R. J. (author)
- University of Manchester
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- Fuller, G. A. (author)
- University of Manchester
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- Henkel, C. (author)
- 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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- Kohno, K. (author)
- University of Tokyo, Japan
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- Alatalo, K. (author)
- Space Telescope Science Institute (STScI)
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Muhle, S. (author)
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(creator_code:org_t)
- 2019-07-15
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 627
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Abstract
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- High-resolution (0.'03-0.'09 (9-26 pc)) ALMA (100-350 GHz (λ3 to 0.8 mm)) and (0.'04 (11 pc)) VLA 45 GHz measurements have been used to image continuum and spectral line emission from the inner (100 pc) region of the nearby infrared luminous galaxy IC 860. We detect compact (r ∼ 10 pc), luminous, 3 to 0.8 mm continuum emission in the core of IC 860, with brightness temperatures TB > 160 K. The 45 GHz continuum is equally compact but significantly fainter in flux. We suggest that the 3 to 0.8 mm continuum emerges from hot dust with radius r ∼ 8 pc and temperature Td ∼ 280 K, and that it is opaque at millimetre wavelengths, implying a very large H2 column density N(H2)≥ 1026 cm-2. Vibrationally excited lines of HCN v2 = 1f J = 4 - 3 and 3-2 (HCN-VIB) are seen in emission and spatially resolved on scales of 40-50 pc. The line-to-continuum ratio drops towards the inner r = 4 pc, resulting in a ring-like morphology. This may be due to high opacities and matching HCN-VIB excitation- and continuum temperatures. The HCN-VIB emission reveals a north-south nuclear velocity gradient with projected rotation velocities of v = 100 km s-1 at r = 10 pc. The brightest emission is oriented perpendicular to the velocity gradient, with a peak HCN-VIB 3-2 TB of 115 K (above the continuum). Vibrational ground-state lines of HCN 3-2 and 4-3, HC15N 4-3, HCO+ 3-2 and 4-3, and CS 7-6 show complex line absorption and emission features towards the dusty nucleus. Redshifted, reversed P-Cygni profiles are seen for HCN and HCO+ consistent with gas inflow with vin ≤ 50 km s-1. Foreground absorption structures outline the flow, and can be traced from the north-east into the nucleus. In contrast, CS 7-6 has blueshifted line profiles with line wings extending out to -180 km s-1. We suggest that a dense and slow outflow is hidden behind a foreground layer of obscuring, inflowing gas. The centre of IC 860 is in a phase of rapid evolution where an inflow is building up a massive nuclear column density of gas and dust that feeds star formation and/or AGN activity. The slow, dense outflow may be signaling the onset of feedback. The inner, r = 10 pc, IR luminosity may be powered by an AGN or a compact starburst, which then would likely require a top-heavy initial mass function.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
- 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)
Keyword
- ISM: molecules
- Galaxies: active
- Galaxies: evolution
- Galaxies: ISM
- ISM: jets and outflows
- Galaxies: individual: IC 860
Publication and Content Type
- art (subject category)
- ref (subject category)
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Aalto, Susanne, ...
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Muller, Sebastie ...
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König, Sabine, 1 ...
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Falstad, Niklas, ...
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Mangum, J. G.
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Sakamoto, K.
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show more...
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Privon, G.
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Gallagher III, J ...
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Combes, F.
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Burillo, S. G.
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Martin, S.
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Viti, Serena
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van der Werf, P.
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Evans, A. S.
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Black, John H, 1 ...
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Varenius, Eskil, ...
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Beswick, R. J.
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Fuller, G. A.
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Henkel, C.
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Kohno, K.
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Alatalo, K.
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Muhle, S.
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Mechanical Engin ...
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and Energy Engineeri ...
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Chalmers University of Technology