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The Dragonfly Galax...
The Dragonfly Galaxy: II. ALMA unveils a triple merger and gas exchange in a hyper-luminous radio galaxy at z = 2
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Emonts, B. (author)
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- De Breuck, C. (author)
- European Southern Observatory (ESO)
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- Lehnert, M. (author)
- Sorbonne Université,Sorbonne University,Institut d 'Astrophysique de Paris
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- Vernet, J. (author)
- European Southern Observatory (ESO)
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- Gullberg, B. (author)
- European Southern Observatory (ESO)
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- Villar-Martin, M. (author)
- Universidad Autonoma de Madrid (UAM)
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- Nesvadba, N. (author)
- Université Paris-Sud XI,University of Paris-Sud XI
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- Drouart, Guillaume, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ivison, R. J. (author)
- European Southern Observatory (ESO),University of Edinburgh
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- Seymour, N. (author)
- Curtin University
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- Wylezalek, D. (author)
- Johns Hopkins University
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- Barthel, P. D. (author)
- Rijksuniversiteit Groningen,University of Groningen
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(creator_code:org_t)
- 2015-11-30
- 2015
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 584
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Abstract
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- The Dragonfly Galaxy (MRC 0152-209), at redshift z similar to 2, is one of the most vigorously star-forming radio galaxies in the Universe. What triggered its activity? We present ALMA Cycle 2 observations of cold molecular CO(6 5) gas and dust, which reveal that this is likely a gas-rich triple merger. It consists of a close double nucleus (separation similar to 4 kpc) and a weak CO-emitter at similar to 10 kpc distance, all of which have counterparts in HST/NICMOS imagery. The hyper-luminous starburst and powerful radio-AGN were triggered at this precoalescent stage of the merger. The CO(6-5) traces dense molecular gas in the central region, and complements existing CO(1-0) data, which reveal more widespread tidal debris of cold gas. We also find similar to 10(10) M-circle dot of molecular gas with enhanced excitation at the highest velocities. At least 20-50% of this high-excitation, high-velocity gas shows kinematics that suggests it is being displaced and redistributed within the merger, although with line-of-sight velocities of vertical bar v vertical bar < 500 km s(-1), this gas will probably not escape the system. The processes that drive the redistribution of cold gas are likely related to either the gravitational interaction between two kpc-scale discs, or starburst/AGN-driven outflows. We estimate that the rate at which the molecular gas is redistributed is at least. M similar to 1200 +/- 500 M-circle dot yr(-1), and could perhaps even approach the star formation rate of similar to 3000 +/- 800 M-circle dot yr(-1). The fact that the gas depletion and gas redistribution timescales are similar implies that dynamical processes can be important in the evolution of massive high-z galaxies.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- submillimeter
- submillimeter: galaxies
- galaxies: high-redshift
- galaxies: active
- infrared: galaxies
- galaxies: interactions
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Emonts, B.
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De Breuck, C.
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Lehnert, M.
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Vernet, J.
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Gullberg, B.
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Villar-Martin, M ...
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show more...
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Nesvadba, N.
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Drouart, Guillau ...
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Ivison, R. J.
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Seymour, N.
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Wylezalek, D.
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Barthel, P. D.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
- By the university
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Chalmers University of Technology