Journal article
Herschel-ATLAS: A Binary HyLIRG Pinpointing a Cluster of Starbursting Protoellipticals
The Astrophysical journal, Vol.772(2), 137
08/2013
DOI: 10.1088/0004-637X/772/2/137
Abstract
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 × 1011 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 ≈1014.6-M ⊙ cluster.
Details
- Title: Subtitle
- Herschel-ATLAS: A Binary HyLIRG Pinpointing a Cluster of Starbursting Protoellipticals
- Creators
- R. J Ivison - University of EdinburghA. M Swinbank - Durham UniversityIan Smail - Durham UniversityA. I Harris - University of Maryland, College ParkR. S Bussmann - Harvard UniversityA Cooray - University of California, IrvineP Cox - Institut de RadioAstronomie MillimétriqueH Fu - University of California, IrvineA Kovács - University of MinnesotaM Krips - Institut de RadioAstronomie MillimétriqueD Narayanan - University of ArizonaM Negrello - INAFR Neri - Institut de RadioAstronomie MillimétriqueJ Peñarrubia - University of EdinburghJ Richard - Lyon CollegeD. A Riechers - Cornell UniversityK Rowlands - University of NottinghamJ. G Staguhn - Johns Hopkins UniversityT. A Targett - University of EdinburghS Amber - Open UniversityA. J Baker - Rutgers, The State University of New JerseyN Bourne - University of NottinghamF Bertoldi - University of BonnM Bremer - University of BristolJ. A Calanog - University of California, IrvineD. L Clements - Imperial College LondonH Dannerbauer - University of ViennaA Dariush - University of CambridgeG De Zotti - Scuola Internazionale Superiore di Studi AvanzatiL Dunne - University of CanterburyS. A Eales - Cardiff UniversityD Farrah - Virginia TechS Fleuren - Queen Mary University of LondonA Franceschini - University of PaduaJ. E Geach - University of HertfordshireR. D George - University of EdinburghJ. C Helly - Durham UniversityR Hopwood - Imperial College LondonE Ibar - Pontificia Universidad Católica de ChileM. J Jarvis - University of OxfordJ.-P Kneib - École Polytechnique Fédérale de LausanneS Maddox - University of CanterburyA Omont - Centre National pour la Recherche Scientifique et Technique (CNRST)D Scott - University of British ColumbiaS Serjeant - Open UniversityM. W. L Smith - AUTRESM. A Thompson - University of HertfordshireE Valiante - Cardiff UniversityI Valtchanov - European Space AgencyJ Vieira - California Institute of TechnologyP Van Der Werf - Leiden University
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.772(2), 137
- DOI
- 10.1088/0004-637X/772/2/137
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 08/2013
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199750502771
Metrics
13 Record Views