Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717016r&link_type=abstract
American Astronomical Society Meeting 207, #170.16; Bulletin of the American Astronomical Society, Vol. 37, p.1429
Astronomy and Astrophysics
Astronomy
Scientific paper
Molecular gas has now been detected in 15 z > 2 QSOs through observations of high-J CO observations using millimeter interferometers. Observations of the CO ground-state transition, CO(1-0), however, have the potential to trace the molecular gas at lower excitations which may give a better estimate for the total molecular gas content in high-z QSOs. Here we present first z > 4 CO(1-0) observations obtained with the NRAO Green Bank Telescope and the MPIfR Effelsberg telescope. With these two 100m class telescopes, we detect the CO(1-0) transition in the high-redshift QSOs BR 1202-0725 (z=4.7), PSS J2322+1944 (z=4.1), and APM 08279+5255 (z=3.9). We find that the CO/FIR luminosity ratios of these high-z sources follow the same trend as seen for low-z galaxies. Utilizing large velocity gradient (LVG) models based on previous results for higher-J CO transitions, we derive that all CO emission can be described by a single gas component and that all molecular gas appears to be concentrated in a compact nuclear region. We thus find no evidence for luminous, extended CO(1-0) components in the molecular gas reservoirs around our target quasars.
Benford Dominic J.
Bertoldi Frank
Carilli Chris L.
Henkel Carsten
Hunter Todd Russell
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