MOLECULAR GAS IN z ∼ 6 QUASAR HOST GALAXIES
MOLECULAR GAS IN z ∼ 6 QUASAR HOST GALAXIES
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DOI：
10.1088/0004-637x/714/1/699
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发表时间：
2010-02
期刊：
影响因子：
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通讯作者：
Ran Wang;C. Carilli;R. Neri;D. Riechers;J. Wagg;F. Walter;F. Bertoldi;K. Menten;A. Omont;P. Cox;Xiaohui Fan
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文献类型：
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作者：
Ran Wang;C. Carilli;R. Neri;D. Riechers;J. Wagg;F. Walter;F. Bertoldi;K. Menten;A. Omont;P. Cox;Xiaohui Fan
我们报告了我们的新观测红移一氧化碳排放从六个z 106类星体，使用IRAM高原德布雷干涉仪。6种污染源中均检测到CO（6-5）或（5-4）谱线发射。加上其他两个以前的CO检测，这些观测提供了独特的约束，在这些类星体系统的分子气体排放特性接近宇宙再电离结束。补充的结果也提出了低J CO线观察到的绿色银行望远镜和甚大阵列，尘埃连续从这些来源的SHARC-II测辐射热仪相机在加州理工学院亚毫米波天文台。然后，我们提出了一个研究的分子气体的性质，在我们的合并样本的8个CO检测类星体在z 106。高阶CO线发射在这些对象中的检测表明存在高度激发的分子气体，估计质量的类星体宿主星系内的订单1010 M返。我们的z <$6类星体与CO探测到的1.4 <$z <$5类星体和亚毫米星系样品的气体质量和CO线宽分布没有显著差异。大多数的CO探测到的类星体在z 106遵循远红外-CO光度关系定义的活跃的恒星形成星系在低和高红移。这表明，正在进行的星星形成在他们的主机显着贡献的尘埃加热远红外波段。这一结果与早期类星体-宿主系统中星系形成与超大质量黑洞（SMBH）吸积同步的图象是一致的。我们调查我们的类星体样本的黑洞，隆起的关系，使用CO动力学作为类星体主机的动态质量的示踪剂。黑洞与核球质量比的估计值中值比目前的0.0014高出约15倍。这对最大质量的SMBH-球状宿主系统在最高红移处的形成和演化产生了重要的限制。
We report our new observations of redshifted carbon monoxide emission from six z ∼ 6 quasars, using the IRAM Plateau de Bure Interferometer. CO (6–5) or (5–4) line emission was detected in all six sources. Together with two other previous CO detections, these observations provide unique constraints on the molecular gas emission properties in these quasar systems close to the end of the cosmic re-ionization. Complementary results are also presented for low-J CO lines observed at the Green Bank Telescope and the Very Large Array, and dust continuum from five of these sources with the SHARC-II bolometer camera at the Caltech Submillimeter Observatory. We then present a study of the molecular gas properties in our combined sample of eight CO-detected quasars at z ∼ 6. The detections of high-order CO line emission in these objects indicates the presence of highly excited molecular gas, with estimated masses on the order of 1010 M☉ within the quasar host galaxies. No significant difference is found in the gas mass and CO line width distributions between our z ∼ 6 quasars and samples of CO-detected 1.4 ⩽ z ⩽ 5 quasars and submillimeter galaxies. Most of the CO-detected quasars at z ∼ 6 follow the far-infrared–CO luminosity relationship defined by actively star-forming galaxies at low and high redshifts. This suggests that ongoing star formation in their hosts contributes significantly to the dust heating at FIR wavelengths. The result is consistent with the picture of galaxy formation co-eval with supermassive black hole (SMBH) accretion in the earliest quasar–host systems. We investigate the black hole–bulge relationships of our quasar sample, using the CO dynamics as a tracer for the dynamical mass of the quasar host. The median estimated black hole–bulge mass ratio is about 15 times higher than the present-day value of ∼0.0014. This places important constraints on the formation and evolution of the most massive SMBH-spheroidal host systems at the highest redshift.