Author
Cañameras, R.Nesvadba, N.
Kneissl, R.
Frye, B.
Gavazzi, R.
Koenig, S.
Le Floc’h, E.
Limousin, M.
Oteo, I.
Scott, D.
Affiliation
Univ Arizona, Steward ObservIssue Date
2017-08-23Keywords
galaxies: starburstgalaxies: high-redshift
submillimeter: galaxies
galaxies: evolution
galaxies: star formation
galaxies: ISM
Metadata
Show full item recordPublisher
EDP SCIENCES S ACitation
Planck’s dusty GEMS 2017, 604:A117 Astronomy & AstrophysicsJournal
Astronomy & AstrophysicsRights
© ESO, 2017.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
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.Note
Open access journal.ISSN
0004-63611432-0746
Version
Final published versionSponsors
JAO visitor grant; CNRS; CNES; European Research Council in the form of the Advanced Investigator Programme [321302, COSMICISM]Additional Links
http://www.aanda.org/10.1051/0004-6361/201630186ae974a485f413a2113503eed53cd6c53
10.1051/0004-6361/201630186