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Herschel-ATLAS: A Binary HyLIRG Pinpointing a Cluster of Starbursting Protoellipticals

Ivison, R. J. and Vieira, J. (2013) Herschel-ATLAS: A Binary HyLIRG Pinpointing a Cluster of Starbursting Protoellipticals. Astrophysical Journal, 772 (2). Art. No. 137. ISSN 0004-637X. doi:10.1088/0004-637X/772/2/137.

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Panchromatic observations of the best candidate hyperluminous infrared galaxies from the widest Herschel extragalactic imaging survey have led to the discovery of at least four intrinsically luminous z = 2.41 galaxies across an 100 kpc region—a cluster of starbursting protoellipticals. Via subarcsecond interferometric imaging we have measured accurate gas and star formation surface densities. The two brightest galaxies span ~3 kpc FWHM in submillimeter/radio continuum and CO J = 4-3, and double that in CO J = 1-0. The broad CO line is due partly to the multitude of constituent galaxies and partly to large rotational velocities in two counter-rotating gas disks—a scenario predicted to lead to the most intense starbursts, which will therefore come in pairs. The disks have M_(dyn) of several × 10^(11) M ☉, and gas fractions of ~40%. Velocity dispersions are modest so the disks are unstable, potentially on scales commensurate with their radii: these galaxies are undergoing extreme bursts of star formation, not confined to their nuclei, at close to the Eddington limit. Their specific star formation rates place them 5 × above the main sequence, which supposedly comprises large gas disks like these. Their high star formation efficiencies are difficult to reconcile with a simple volumetric star formation law. N-body and dark matter simulations suggest that this system is the progenitor of a B(inary)-type 10^(14.6)-M ☉ cluster.

Item Type:Article
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URLURL TypeDescription Paper DOIArticle
Ivison, R. J.0000-0001-5118-1313
Alternate Title:Herschel-ATLAS: a binary HyLIRG pinpointing a cluster of starbursting proto-ellipticals
Additional Information:© 2013 The American Astronomical Society. Received 2013 February 12; accepted 2013 June 11; published 2013 July 17. R.J.I. acknowledges support from the European Research Council (ERC) in the form of Advanced Grant, cosmicism. The Herschel-ATLAS is a project with Herschel, which is an ESA Space Observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. The H-ATLAS Web site is US participants in H-ATLAS acknowledge support from NASA through a contract from JPL. I.R.S. acknowledges support from STFC and ERC. M.N. and G.dZ. acknowledge financial support from ASI/INAF Agreement I/072/09/0. Facilities: CARMA, CSO, Herschel, HST, IRAM: Interferometer, VLA, Keck:II, SMA, Spitzer, ESO: VISTA
Funding AgencyGrant Number
European Research Council (ERC) Advanced Grant CosmicismUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
European Research Council (ERC)UNSPECIFIED
Subject Keywords:galaxies: high-redshift – galaxies: starburst – infrared: galaxies – radio continuum: galaxies – radio lines: galaxies – submillimeter: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20130828-091925316
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Official Citation:Herschel-ATLAS: A Binary HyLIRG Pinpointing a Cluster of Starbursting Protoellipticals R. J. Ivison et al. 2013 ApJ 772 137
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40968
Deposited By: Tony Diaz
Deposited On:30 Aug 2013 18:05
Last Modified:10 Nov 2021 04:24

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