2012ApJ...750...92X -
Astrophys. J., 750, 92 (2012/May-2)
Molecular gas in infrared ultraluminous QSO hosts.
XIA X.Y., GAO Y., HAO C.-N., TAN Q.H., MAO S., OMONT A., FLAQUER B.O., LEON S. and COX P.
Abstract (from CDS):
We report CO detections in 17 out of 19 infrared ultraluminous QSO (IR QSO) hosts observed with the IRAM 30 m telescope. The cold molecular gas reservoir in these objects is in a range of (0.2-2.1)x1010 M☉ (adopting a CO-to-H2 conversion factor αCO= 0.8 M☉(K km/s.pc2)–1). We find that the molecular gas properties of IR QSOs, such as the molecular gas mass, star formation efficiency (LFIR/L'CO), and CO (1-0) line widths, are indistinguishable from those of local ultraluminous infrared galaxies (ULIRGs). A comparison of low- and high-redshift CO-detected QSOs reveals a tight correlation between LFIR and L'CO(1–0)for all QSOs. This suggests that, similar to ULIRGs, the far-infrared emissions of all QSOs are mainly from dust heated by star formation rather than by active galactic nuclei (AGNs), confirming similar findings from mid-infrared spectroscopic observations by Spitzer. A correlation between the AGN-associated bolometric luminosities and the CO line luminosities suggests that star formation and AGNs draw from the same reservoir of gas and there is a link between star formation on ∼kpc scale and the central black hole accretion process on much smaller scales.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - galaxies: evolution - galaxies: high-redshift - galaxies: starburst - radio lines: galaxies
Simbad objects:
32
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