Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..446...43x&link_type=abstract
Galaxy evolution: Infrared to millimeter wavelength perspective. Proceedings of a conference held at Guilin, China 25-29 October
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the detections of molecular gas in 15/19 infrared ultraluminous QSOs (IR QSOs) using the IRAM 30m. The gas reservoir in these objects is several times 109M&sun; to 1010M&sun; that is much higher than those of optically selected Palomar-Green QSOs. In addition, the star formation efficiency, indicating by LFIR and L'CO, and the CO (1-0) line widths for IR QSOs are similar to those of ULIRGs. With a typical star formation rate of few times 100 myear, the cold molecular gas will be consumed within several times 107 to 108 years. By comparing with low-z and high-z CO detected QSOs, we find that there exists tight correlation between LFIR and L'CO for all QSOs, implying that the far infrared emission is mainly from star formation for QSOs.
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