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Herschel-ATLAS : a binary HyLIRG pinpointing a cluster of starbursting protoellipticals.

Ivison, R. J. and Swinbank, A. M. and Smail, Ian and Harris, A. I. and Bussmann, R. S. and Cooray, A. and Cox, P. and Fu, H. and Kovács, A. and Krips, M. and Narayanan, D. and Negrello, M. and Neri, R. and Peñarrubia, J. and Richard, J. and Riechers, D. A. and Rowlands, K. and Staguhn, J. G. and Targett, T. A. and Amber, S. and Baker, A. J. and Bourne, N. and Bertoldi, F. and Bremer, M. and Calanog, J. A. and Clements, D. L. and Dannerbauer, H. and Dariush, A. and De Zotti, G. and Dunne, L. and Eales, S. A. and Farrah, D. and Fleuren, S. and Franceschini, A. and Geach, J. E. and George, R. D. and Helly, J. C. and Hopwood, R. and Ibar, E. and Jarvis, M. J. and Kneib, J.-P. and Maddox, S. and Omont, A. and Scott, D. and Serjeant, S. and Smith, M. W. L. and Thompson, M. A. and Valiante, E. and Valtchanov, I. and Vieira, J. and van der Wef, P. (2013) 'Herschel-ATLAS : a binary HyLIRG pinpointing a cluster of starbursting protoellipticals.', Astrophysical journal., 772 (2). p. 137.


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.

Item Type:Article
Keywords:Galaxies, High-redshift, Starburst, Infrared, Radio continuum, Radio lines, Submillimeter.
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Publisher statement:© 2013. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
Date accepted:No date available
Date deposited:05 September 2013
Date of first online publication:2013
Date first made open access:No date available

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