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dc.contributor.authorBanerji, Mandaen
dc.contributor.authorFabian, Andrewen
dc.contributor.authorMcMahon, Richarden
dc.date.accessioned2014-07-17T14:45:12Z
dc.date.available2014-07-17T14:45:12Z
dc.date.issued2014-01-16en
dc.identifier.citationManda Banerji, A. C. Fabian, and R. G. McMahon "ULASJ1234+0907: the reddest type 1 quasar at z = 2.5 revealed in the X-ray and far-infrared" MNRAS first published online January 16, 2014 doi:10.1093/mnrasl/slt178en
dc.identifier.issn1745-3925
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/245542
dc.description.abstractWe present Herschel and XMM–Newton observations of ULASJ1234+0907 (z = 2.503), the reddest broad-line type 1 quasar currently known with (i − K)AB > 7.1. Herschel observations indicate that the quasar host is a hyperluminous infrared galaxy with a total infrared luminosity of log10(LIR/L) = 13.90 ± 0.02. A greybody fit gives a dust temperature of Td = 60 ± 3 K assuming an emissivity index of β = 1.5, considerably higher than in submillimeter bright galaxies observed at similar redshifts. The star formation rate is estimated to be >2000 M yr−1 even accounting for a significant contribution from an active galactic nucleus (AGN) component to the total infrared luminosity or requiring that only the farinfrared luminosity is powered by a starburst. XMM–Newton observations constrain the hard X-ray luminosity to beL2−10 keV = 1.3×1045 erg s−1, putting ULASJ1234+0907 among the brightest X-ray quasars known. Through very deep optical and near-infrared imaging of the field at subarcsecond seeing, we demonstrate that despite its extreme luminosity, it is highly unlikely that ULASJ1234+0907 is being lensed. We measure a neutral hydrogen column density of NH = 9.0 × 1021 cm−2 corresponding to AV ∼ 6. The observed properties of ULASJ1234+0907 – high luminosity and Eddington ratio, broad lines, moderate column densities and significant infrared emission from reprocessed dust – are similar to those predicted by galaxy formation simulations for the AGN blowout phase. The high Eddington ratio, combined with the presence of significant amounts of dust, is expected to drive strong outflows due to the effects of radiation pressure on dust.
dc.description.sponsorshipThis work is based on observations made withXMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA and the ESO telescopes at the La Silla Paranal Observatory under programme ID: 290.A-5062.
dc.languageEnglishen
dc.language.isoenen
dc.publisherOxford University Press
dc.rightsDSpace@Cambridge license
dc.subjectgalaxies: activeen
dc.subjectquasars: generalen
dc.subjectquasars: individualen
dc.titleULASJ1234+0907: the reddest type 1 quasar at z = 2.5 revealed in the X-ray and far-infrareden
dc.typeArticle
dc.description.versionThis is the version of record, which can also be found on the publisher's website at: http://mnrasl.oxfordjournals.org/content/early/2014/01/16/mnrasl.slt178 © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Societyen
prism.endingPage55
prism.publicationDate2014en
prism.publicationNameMonthly Notices of the Royal Astronomical Society: Lettersen
prism.startingPage51
prism.volume439en
dc.rioxxterms.funderSTFC
rioxxterms.versionofrecord10.1093/mnrasl/slt178en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2014-01-16en
dc.contributor.orcidBanerji, Manda [0000-0002-0639-5141]
dc.contributor.orcidFabian, Andrew [0000-0002-9378-4072]
dc.contributor.orcidMcMahon, Richard [0000-0001-8447-8869]
dc.identifier.eissn1745-3933
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/H00243X/1)
pubs.funder-project-idSTFC (ST/L001381/1)
pubs.funder-project-idSTFC (ST/K000985/1)
pubs.funder-project-idSTFC (ST/J001538/1)


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