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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710205.0, MPI für Astronomie / Publikationen_mpia
Discovery of eight z ~ 6 quasars from Pan-STARRS1
Authors:Bañados, E.; Venemans, B. P.; Morganson, E.; Decarli, R.; Walter, F.; Chambers, K. C.; Rix, H. -. W.; Farina, E. P.; Fan, X.; Jiang, L.; McGreer, I.; De Rosa, G.; Simcoe, R.; Weiß, A.; Price, P. A.; Morgan, J. S.; Burgett, W. S.; Greiner, J.; Kaiser, N.; Kudritzki, R. -. P.; Magnier, E. A.; Metcalfe, N.; Stubbs, C. W.; Sweeney, W.; Tonry, J. L.; Wainscoat, R. J.; Waters, C.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astronomical Journal
Issue / Number:1
Start Page:id. 14 (12 pp)
Audience:Not Specified
Abstract / Description:High-redshift quasars are currently the only probes of the growth of supermassive black holes and potential tracers of structure evolution at early cosmic time. Here we present our candidate selection criteria from the Panoramic Survey Telescope & Rapid Response System 1 and follow-up strategy to discover quasars in the redshift range 5.7 <~ z <~ 6.2. With this strategy we discovered eight new 5.7 <= z <= 6.0 quasars, increasing the number of known quasars at z > 5.7 by more than 10%. We additionally recovered 18 previously known quasars. The eight quasars presented here span a large range of luminosities (--27.3 <= M 1450 <= --25.4 19.6 <= z P1 <= 21.2) and are remarkably heterogeneous in their spectral features: half of them show bright emission lines whereas the other half show a weak or no Lyalpha emission line (25% with rest-frame equivalent width of the Lyalpha +N V line lower than 15 Å). We find a larger fraction of weak-line emission quasars than in lower redshift studies. This may imply that the weak-line quasar population at the highest redshifts could be more abundant than previously thought. However, larger samples of quasars are needed to increase the statistical significance of this finding.
Free Keywords:cosmology: observations; quasars: emission lines; quasars: general; surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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