The Redshift Search Receiver Observations of Local ULIRGs

Details The Redshift Search Receiver Observations of Local ULIRGs The Redshift Search Receiver Observations of Local ULIRGs

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21334906c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #349.06; Bulletin of the American Astronomical Society, Vol. 41, p.486

Astronomy and Astrophysics

Astronomy

Scientific paper

We present 12CO (J=1-0) observations of ultraluminous infrared galaxies (ULIRGs) obtained using the redshift search receiver (RSR) on the Five Colleges Radio Astronomy Observatory 14-m telescope. The RSR is a novel, dual-beam, dual-polarization receiver equipped with an ultra-wideband spectrometer backend that is being built as a facility receiver for the Large Millimeter Telescope. Our sample consists of 29 ULIRGs in the redshift range of 0.04-0.11, including 18 objects that were never observed at this wavelength before. We have detected 25 systems (a detection rate of 86%), including sixteen ULIRGs that are detected in CO for the first time. Our study has doubled the number of local ULIRGs with CO measurement and probed deeper into the CO faint objects compared to previous similar surveys. As a result, we find 1) a smoother transition between ULIRG population and local QSOs in LFIR-LCO' ("star formation efficiency") space, and 2) a broader range of LFIR/L CO' flux ratio (a few tens to 103 Lsun [K km/s pc2]) than previously reported. In our new survey, we also have found a small number of ULIRGs with extreme LFIR/LCO' which had been known to be rare. In this paper, we have investigated the mid-IR color and radio-excess of 58 local ULIRGs as a function of FIR-to-CO flux ratio, and compared it with those of spirals/starburst galaxies and low-z QSOs. Using a large sample of local ULIRGs, we explore the origin of their current power source and potential evolution to QSOs.

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