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Planck's dusty GEMS...
Planck's dusty GEMS IV. Star formation and feedback in a maximum starburst at z=3 seen at 60-pc resolution
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- Canameras, R. (author)
- Université Paris-Sud XI,University of Paris-Sud XI
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- Nesvadba, N. (author)
- Université Paris-Sud XI,University of Paris-Sud XI
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- Kneissl, R. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Frye, B. (author)
- University of Arizona
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Gavazzi, R. (author)
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- König, Sabine, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Le Floc'H, E. (author)
- Centre national de la recherche scientifique (CNRS)
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- Limousin, M. (author)
- Laboratoire d'Astrophysique de Marseille
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- Oteo, I. (author)
- University of Edinburgh,European Southern Observatory (ESO)
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- Scott, D. (author)
- University of British Columbia (UBC)
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(creator_code:org_t)
- 2017-08-23
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 604, s. Article no A117 -
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Abstract
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- We present an analysis of high-resolution ALMA interferometry of CO(4-3) line emission and dust continuum in the "Ruby" (PLCK_G244.8+54.9), a bright, gravitationally lensed galaxy at z = 3.0 discovered with the Planck all-sky survey. The Ruby is the brightest of Planck's dusty GEMS, a sample of 11 of the brightest gravitationally lensed high-redshift galaxies on the extragalactic sub-mm sky. We resolve the high-surface-brightness continuum and CO line emission of the Ruby in several extended clumps along a partial, nearly circular Einstein ring with 1.4 '' diameter around a massive galaxy at z = 1.5. Local star-formation intensities are up to 2000 M-circle dot yr(-1) kpc(-2), amongst the highest observed at high redshift, and clearly in the range of maximal starbursts. Gas-mass surface densities are a few x10(4) M-circle dot pc(-2). The Ruby lies at, and in part even above, the starburst sequence in the Schmidt-Kennicutt diagram, and at the limit expected for star formation that is self-regulated through the kinetic energy injection from radiation pressure, stellar winds, and supernovae. We show that these processes can also inject sufficient kinetic energy and momentum into the gas to explain the turbulent line widths, which are consistent with marginally gravitationally bound molecular clouds embedded in a critically Toomre-stable disk. The star-formation efficiency is in the range 1-10% per free-fall time, consistent with the notion that the pressure balance that sets the local star-formation law in the Milky Way may well be universal out to the highest star-formation intensities. AGN feedback is not necessary to regulate the star formation in the Ruby, in agreement with the absence of a bright AGN component in the infrared and radio regimes.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Conversion Factor
- galaxies: star
- galaxies: evolution
- Ultraluminous Infrared Galaxies
- Forming Galaxies
- Formation Law
- Interstellar-Medium
- submillimeter: galaxies
- Molecular
- High-Redshift
- Gravitational-Instability
- Alma
- Lensed Submillimeter Galaxy
- Dense Gas Disk
- galaxies: starburst
- galaxies: high-redshift
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Canameras, R.
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Nesvadba, N.
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Kneissl, R.
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Frye, B.
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Gavazzi, R.
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König, Sabine, 1 ...
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show more...
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Le Floc'H, E.
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Limousin, M.
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Oteo, I.
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Scott, 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 ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology