%0 Generic %1 husemann2017integral %A Husemann, B. %A Davis, T. A. %A Jahnke, K. %A Dannerbauer, H. %A Urrutia, T. %A Hodge, J. %D 2017 %K feedback gas molecular quasar %T Integral field spectroscopy of nearby QSOs II. The molecular gas content and condition for star formation %U http://arxiv.org/abs/1705.03076 %X We present single-dish CO(1-0) and CO(2-1) observations for 14 low-redshift quasi-stellar objects (QSOs). In combination with optical integral field spectroscopy we study how the cold gas content relates to the star formation rate (SFR) and black hole accretion rate. CO(1-0) is detected in 8 of 14 targets and CO(2-1) is detected in 7 out of 11 cases. The majority of disc-dominated QSOs reveal gas fractions and depletion times well matching normal star forming systems. Two gas-rich major mergers show clear starburst signatures with higher than average gas fractions and shorter depletion times. Bulge-dominated QSO hosts are mainly undetected in CO(1-0) which corresponds, on average, to lower gas fractions than in disc-dominated counterparts. Their SFRs however imply shorter than average depletion times and higher star formation efficiencies. Negative QSO feedback through removal of cold gas seems to play a negligible role in our sample. We find a trend between black hole accretion rate and total molecular gas content for disc-dominated QSOs when combined with literature samples. We interpret this as an upper envelope for the nuclear activity and is well represented by a scaling relation between the total and circum-nuclear gas reservoir accessible for accretion. Bulge-dominated QSOs significantly differ from that scaling relation and appear uncorrelated with the total molecular gas content. This could be explained either by a more compact gas reservoir, blow out of the gas envelope through outflows, or a different ISM phase composition.

@misc{husemann2017integral, abstract = {We present single-dish CO(1-0) and CO(2-1) observations for 14 low-redshift quasi-stellar objects (QSOs). In combination with optical integral field spectroscopy we study how the cold gas content relates to the star formation rate (SFR) and black hole accretion rate. CO(1-0) is detected in 8 of 14 targets and CO(2-1) is detected in 7 out of 11 cases. The majority of disc-dominated QSOs reveal gas fractions and depletion times well matching normal star forming systems. Two gas-rich major mergers show clear starburst signatures with higher than average gas fractions and shorter depletion times. Bulge-dominated QSO hosts are mainly undetected in CO(1-0) which corresponds, on average, to lower gas fractions than in disc-dominated counterparts. Their SFRs however imply shorter than average depletion times and higher star formation efficiencies. Negative QSO feedback through removal of cold gas seems to play a negligible role in our sample. We find a trend between black hole accretion rate and total molecular gas content for disc-dominated QSOs when combined with literature samples. We interpret this as an upper envelope for the nuclear activity and is well represented by a scaling relation between the total and circum-nuclear gas reservoir accessible for accretion. Bulge-dominated QSOs significantly differ from that scaling relation and appear uncorrelated with the total molecular gas content. This could be explained either by a more compact gas reservoir, blow out of the gas envelope through outflows, or a different ISM phase composition.}, added-at = {2017-05-10T10:19:23.000+0200}, author = {Husemann, B. and Davis, T. A. and Jahnke, K. and Dannerbauer, H. and Urrutia, T. and Hodge, J.}, biburl = {https://www.bibsonomy.org/bibtex/2b435d64e51310a137461e14f22674db5/miki}, description = {[1705.03076] Integral field spectroscopy of nearby QSOs II. The molecular gas content and condition for star formation}, interhash = {552c548134463506214a2b9ad2ff1c3b}, intrahash = {b435d64e51310a137461e14f22674db5}, keywords = {feedback gas molecular quasar}, note = {cite arxiv:1705.03076Comment: 17 pages, 6 figures, 4 tables, accepted for publication in MNRAS}, timestamp = {2017-05-10T10:19:23.000+0200}, title = {Integral field spectroscopy of nearby QSOs II. The molecular gas content and condition for star formation}, url = {http://arxiv.org/abs/1705.03076}, year = 2017 }