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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 11055.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Imaging low-order CO emission from the z = 4.12 quasi-stellar object PSS J2322+1944
Authors:Carilli, C. L.; Cox, P.; Bertoldi, F.; Menten, K. M.; Omont, A.; Djorgovski, S. G.; Petric, A.; Beelen, A.; Isaak, K. G.; McMahon, R. G.
Date of Publication (YYYY-MM-DD):2002-08-10
Title of Journal:Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Issue / Number:1
Start Page:145
End Page:149
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present observations of CO (1-0) and CO (2-1) emission from the z = 4.12 quasi-stellar object (QSO) PSS J2322+1944 using the Very Large Array.(1) The CO emission is extended on a spatial scale of 2". This extension could reflect the double nature of the QSO, as seen in the optical, or could be diffuse emission with a (redshift-corrected) mean brightness temperature of 2.8 K for the CO (2-1) line. We find that CO excitation conditions are lower than in two other IR-luminous z > 4 QSOs, suggesting the presence of a significant contribution from cooler, lower density molecular gas [n(H-2) similar to 5 x 10(3) cm(3), although such a conclusion is complicated by the possibility of differential gravitational magnification.
Free Keywords:galaxies : evolution; galaxies : starburst; infrared : galaxies; quasars : individual (PSS J2322+1944); radio continuum : galaxies; radio lines : galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Natl Radio Astron Observ, POB O, Socorro, NM 87801 USA; Natl Radio Astron Observ, Socorro, NM 87801 USA; Univ Paris 11, Inst Astrophys Spatial, F-91405 Orsay, France; Max Planck Inst Radioastron, D-53121 Bonn, Germany; Inst Astrophys, CNRS, F-75014 Paris, France; CALTECH, Dept Astron, Pasadena, CA 91125 USA; Columbia Univ, Dept Astron, New York, NY 10027 USA; Univ Cambridge, Cambridge CB2 1TN, England; Univ Cambridge, Astron Inst, Cambridge CB2 1TN, England
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