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hal.structure.identifierSTMicroelectronics [Crolles] [ST-CROLLES]
dc.contributor.authorSALOMÉ, Pascal
dc.contributor.authorGUELIN, M.
dc.contributor.authorDOWNES, D.
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorCOX, P.
hal.structure.identifierAMOR 2012
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
dc.contributor.authorOMONT, A.
hal.structure.identifierInstitut d'Astrophysique de Paris [IAP]
dc.contributor.authorGAVAZZI, R.
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorNERI, R.
dc.date.created2012-09-07
dc.date.issued2012
dc.identifier.issn0004-6361
dc.description.abstractEnThe radio-quiet quasar BR1202-0725 (z=4.695) is a remarkable source with a bright Northwest (NW) companion detected at submm and radio wavelengths but invisible in the optical. In the absence of amplification by gravitational lensing, BR1202-0725 would be the most luminous binary CO and FIR source in the Universe. In this paper, we report observations with the IRAM Plateau de Bure interferometer of BR1202-0725 in the redshifted emission of the CO(5-4) and (7-6) lines, the [C I](3P2-3P1) line, a high angular resolution (0.3 x 0.8 arcsec) 1.3 mm map of the rest-frame, far-IR dust continuum, and a search for the CO(11-10) line. We compare these results with recent ALMA data in the [C II] line. Both the quasar host galaxy and its NW companion are spatially resolved in the molecular line emission and the dust continuum. The CO profile of the NW companion is very broad with a full width at half maximum of 1000 +/- 130 km/s, compared to 360 +/- 40 km/s for the quasar host galaxy to the Southeast (SE). The difference in linewidths and center velocities, and the absence of any lens candidate or arc-like structure in the field, at any wavelength, show that the obscured NW galaxy and the SE quasar host galaxy cannot be lensed images of the same object. Instead, we find morphological and kinematic evidence for sub-structures in both the NW and SE sources. We interpret these results as strong indications that the BR1202-0725 complex is a group of young, interacting, and highly active starburst galaxies.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.engalaxies: high-redshift
dc.subject.engalaxies: star clusters: individual: BR1202-0725
dc.subject.entechniques: interferometric
dc.subject.encosmology: observations
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201219955
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1207.6722
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A57
bordeaux.volume545
bordeaux.peerReviewedoui
hal.identifierhal-00863527
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00863527v1
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