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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660949.0, MPI für Astronomie / Publikationen_mpia
Resolved [CII] emission in a lensed quasar at z = 4.4
Authors:Gallerani, S.; Neri, R.; Maiolino, R.; Martín, S.; De Breuck, C.; Walter, F.; Caselli, P.; Krips, M.; Meneghetti, M.; Nagao, T.; Wagg, J.; Walmsley, M.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Astronomy and Astrophysics
Volume:543
Start Page:id.A114
Audience:Not Specified
Abstract / Description:We present one of the first resolved maps of the [CII] 158 μm line, a powerful tracer of the star forming inter-stellar medium, at high redshift. We use the new IRAM PdBI receivers at 350 GHz to map this line in BRI 0952-0115, the host galaxy of a lensed quasar at z = 4.4 previously found to be very bright in [CII] emission. The [CII] emission is clearly resolved and our data allow us to resolve two [CII] lensed images associated with the optical quasar images. We find that the star formation, as traced by [CII], is distributed over a region of about 1 kpc in size near the quasar nucleus, and we infer a star formation surface density ≳ 150 M&sun; yr-1 kpc-2, similar to that observed in local ULIRGs. We also reveal another [CII] component, extended over ~12 kpc, and located at about 10 kpc from the quasar. We suggest that this component is a companion disk galaxy, in the process of merging with the quasar host, whose rotation field is distorted by the interaction with the quasar host, and where star formation, although intense, is more diffuse. These observations suggest that galaxy merging at high-z can enhance star formation at the same time in the form of more compact regions, in the vicinity of the accreting black hole, and in more extended star forming galaxies. Based on observations made with the IRAM Plateau de Bure Interferometer.
Free Keywords:galaxies: high-redshift; galaxies: ISM; quasars: individual: BRI 0952-0115; submillimeter: galaxies; infrared: galaxies; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012A%26A...543A.11...
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