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arXiv 2007.10351astro-ph.GAastro-ph.HE
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类星体、外流和喷流所在的局部星系中的高分子气体含量和恒星形成率

High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets

M. E. Jarvis, C. M. Harrison, V. Mainieri, G. Calistro Rivera, P. Jethwa, Z. -Y. Zhang, D. M. Alexander, C. Circosta, T. Costa, C. De Breuck, D. Kakkad, P. Khar… 展开作者

M. E. Jarvis, C. M. Harrison, V. Mainieri, G. Calistro Rivera, P. Jethwa, Z. -Y. Zhang, D. M. Alexander, C. Circosta, T. Costa, C. De Breuck, D. Kakkad, P. Kharb, G. B. Lansbury, A. P. Thomson

摘要:

我们使用了一个强大的z~0.1的2型类星体(“遮蔽”; log[L(AGN)/erg/s]>~45)的样本,其中主机千秒级的电离外流和喷流,以确定可能的AGN反馈的总分子气体库的主机星系的签名。具体来说,我们提出了阿塔卡马探路者实验(APEX)的CO(2-1)过渡的九个来源和CO(6-5)的一个子集的三个观察。我们发现我们的大部分样本都位于星暴星系中(平均比恒星形成率为1.7/Gyr),其中7个CO探测到的类星体也具有大的分子气体库(平均Mgas = 1.3x10^10Msun),尽管我们没有对恒星形成或分子气体性质进行预选。尽管存在类星体和外流,我们发现分子气体分数(Mgas/Mstar = 0.1-1.2)和耗尽时间(Mgas/SFR = 0.16-0.95Gyr)与预期的整体星系人口与匹配的恒星质量和特定的恒星形成率是一致的。此外,对于三个目标中的至少两个目标所需的测量,CO(6-5)/CO(2-1)的发射线比是一致的恒星形成主导CO激发在这个范围内的过渡。我们研究中的目标代表了星系演化的富含气体的阶段,同时具有高水平的恒星形成和核活动;此外,喷流和外流不会对全球分子气体储层产生直接的明显影响。

英文摘要:

We use a sample of powerful z~0.1 type 2 quasars ('obscured'; log[L(AGN)/erg/s]>~45), which host kiloparsec-scale ionized outflows and jets, to identify possible signatures of AGN feedback on the total molecular gas reservoirs of their host galaxies. Specifically, we present Atacama Pathfinder EXperiment (APEX) observations of the CO(2-1) transition for nine sources and the CO(6-5) for a subset of three. We find that the majority of our sample reside in starburst galaxies (average specific star formation rates of 1.7/Gyr), with the seven CO-detected quasars also having large molecular gas reservoirs (average Mgas = 1.3x10^10Msun), even though we had no pre-selection on the star formation or molecular gas properties. Despite the presence of quasars and outflows, we find that the molecular gas fractions (Mgas/Mstar = 0.1-1.2) and depletion times (Mgas/SFR = 0.16-0.95Gyr) are consistent with those expected for the overall galaxy population with matched stellar masses and specific star formation rates. Furthermore, for at least two of the three targets with the required measurements, the CO(6-5)/CO(2-1) emission-line ratios are consistent with star formation dominating the CO excitation over this range of transitions. The targets in our study represent a gas-rich phase of galaxy evolution with simultaneously high levels of star formation and nuclear activity; furthermore, the jets and outflows do not have an immediate appreciable impact on the global molecular gas reservoirs.

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