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Spatially Resolved ...
Spatially Resolved CO SLED of the Luminous Merger Remnant NGC 1614 with ALMA
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- Saito, Toshiki (författare)
- University of Tokyo, Japan,National Astronomical Observatory of Japan
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- Iono, D. (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Xu, C. K. (författare)
- California Institute of Technology (Caltech)
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- Sliwa, Kazimierz (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Ueda, Junko (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Espada, D. (författare)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Kaneko, Hiroyuki (författare)
- National Astronomical Observatory of Japan
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- König, Sabine, 1983 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nakanishi, K. (författare)
- National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
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- Lee, Minju (författare)
- University of Tokyo, Japan,National Astronomical Observatory of Japan
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- Yun, Min S. (författare)
- University of Massachusetts
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- Aalto, Susanne, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hibbard, John E. (författare)
- National Radio Astronomy Observatory
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Yamashita, Takuji (författare)
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- Motohara, Kentaro (författare)
- University of Tokyo, Japan
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- Kawabe, R. (författare)
- University of Tokyo, Japan,The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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(creator_code:org_t)
- 2017-01-30
- 2017
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 835:2
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Abstract
Ämnesord
Stäng
- We present high-resolution (1.?0) Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO (1-0) and CO (2-1) rotational transitions toward the nearby IR-luminous merger NGC 1614 supplemented with ALMA archival data of CO (3-2) and CO (6-5) transitions. The CO (6-5) emission arises from the starburst ring (central 590 pc in radius), while the lower-J CO lines are distributed over the outer disk (?3.3 kpc in radius). Radiative transfer and photon-dominated region (PDR) modeling reveals that the starburst ring has a single warmer gas component with more a intense far-ultraviolet radiation field (nh2 ? 104.6 cm-3, Tkin ?42 K, and G0 ?102.7) relative to the outer disk (nh2 ? 105.1 cm-3, Tkin ? 22 K, and G0 ?100.9 cm-3, K, and ). A two-phase molecular interstellar medium with a warm and cold (>70 and ?19 K) component is also an applicable model for the starburst ring. A possible source for heating the warm gas component is mechanical heating due to stellar feedback rather than PDR. Furthermore, we find evidence for non-circular motions along the north-south optical bar in the lower-J CO images, suggesting a cold gas inflow. We suggest that star formation in the starburst ring is sustained by the bar-driven cold gas inflow and that starburst activities radiatively and mechanically power the CO excitation. The absence of a bright active galactic nucleus can be explained by a scenario where cold gas accumulating on the starburst ring is exhausted as the fuel for star formation or is launched as an outflow before being able to feed to the nucleus.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- submillimeter: galaxies
- galaxies: individual (NGC 1614
- Arp 186)
- radiative transfer
- galaxies: ISM
- galaxies: interactions
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Saito, Toshiki
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Iono, D.
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Xu, C. K.
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Sliwa, Kazimierz
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Ueda, Junko
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Espada, D.
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Kaneko, Hiroyuki
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König, Sabine, 1 ...
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Nakanishi, K.
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Lee, Minju
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Yun, Min S.
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Aalto, Susanne, ...
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Hibbard, John E.
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Yamashita, Takuj ...
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Motohara, Kentar ...
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Kawabe, R.
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