Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840810w&link_type=abstract
American Astronomical Society, AAS Meeting #218, #408.10; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new observations of the CO (2-1) line emission toward five z 6 quasars using the Ka-band receiver on the Expand Very Large Array (EVLA) and two of them have been detected. CO (2-1) transition is an ideal indicator of the total molecular gas masses, as it is suggested to be thermalized in the quasar host galaxies. The new Ka band receiver on the EVLA opens a unique and important window for observations of the CO (2-1) line emission toward the earliest quasars with ideal spectral sensitivity. The observations, together with the previous measurements of the CO (6-5) and (5-4) lines, reveals important constraints on the molecular gas properties and CO excitation in the quasar host galaxies. Additionally, we have resolve the CO (2-1) line emission in the z=6.2 quasar J1429+5447 into two distinct peaks. The result suggests a possible gas-rich, major merging system at the earliest epoch.
Beelen Alexander
Bertoldi Frank
Carilli Chris
Cox Pierre
Fan Xiaohui
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