Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..375..148r&link_type=abstract
From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies ASP Conference Series, Vol. 375, proceedings of the conference
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Molecular gas has now been detected in 15 z > 2 QSOs through observations of high-J CO transitions 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 of the total molecular gas content of high-z QSOs. Here we present the first z > 4 CO(1--0) observations obtained with the NRAO Green Bank Telescope (GBT) and the MPIfR Effelsberg telescope. Utilizing the K band receivers of these two 100 m radio telescopes, we detect the CO(1--0) transition in the high-redshift QSOs BR1202-0725 (z=4.7), PSS J2322+1944 (z=4.1), and APM08279+5255 (z=3.9). From LVG models based on our observations out to z = 4.7, we derive that the CO emission from all observed transitions can be described by a single gas component, and that all molecular gas appears to be concentrated in a compact nuclear region. The spectral capabilities of the GBT (1 × 200 MHz in high-resolution mode, 2 × 800 MHz in high-bandwidth mode) allow us to cover velocity ranges of up to 22,000 km s-1, or Δ z/z = 0.09 at z = 4, which will be imperative for future high-z studies in galaxies with known strong dust continuum but poorly constrained redshift. This is a first step towards observations with future z-machines.
Benford Dominic J.
Bertoldi Frank
Carilli Chris L.
Henkel Carsten
Hunter Todd Russell
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