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

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dc.contributor.authorIvison, R.J.
dc.contributor.authorSwinbank, A.M.
dc.contributor.authorJarvis, Matt
dc.date.accessioned2016-03-13T17:55:18Z
dc.date.available2016-03-13T17:55:18Z
dc.date.issued2013
dc.description.abstractPanchromatic 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 Mdyn of several ×1011M , 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.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationIvison, R.J. et al. (2013). Herschel-ATLAS: A binary HyLIRG pinpointing a cluster of starbursting protoellipticals. The Astrophysical Journal, 772(2): 137en_US
dc.identifier.issn0004-637x
dc.identifier.urihttp://hdl.handle.net/10566/2088
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherAmerican Astronomical Societyen_US
dc.rightsAAS grants back to authors the non-exclusive right of republication, subject only to giving appropriate credit to the journal in which the article was published. This non-exclusive right of republication gives authors the right to approve or deny reproduction of all or part of the article and to post the final published version online.
dc.source.urihttp://dx.doi.org/10.1088/0004-637X/772/2/137
dc.status.ispeerreviewedtrue
dc.subjectAstrophysicsen_US
dc.subjectGalaxiesen_US
dc.subjectPanchromatic observationsen_US
dc.subjectHerschelen_US
dc.subjectRadio continuumen_US
dc.subjectStarbursten_US
dc.subjectSubmillimeter galaxiesen_US
dc.subjectRadio linesen_US
dc.subjectHyperluminous infrared (IR) galaxies (HyLIRGs)en_US
dc.titleHerschel-ATLAS: A binary HyLIRG pinpointing a cluster of starbursting protoellipticalsen_US
dc.typeArticleen_US

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