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CO(1-0) Emission from Quasar Host Galaxies Beyond Redshift 4

机译:Quasar主机星系的CO(1-0)排放到超出红移4

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Molecular gas has now been detected in 15 z.> 2,QSOs through observations of high-J CO transitions using millimeter interferometers. Observations of the CO ground-state transition CO(1-0), however, have the potential to trace the molecular gas at lower excitations, which may give a better estimate of the total molecular gas, content of high-z QSOs. Here we present the first z > 4 CO(1-0) observations obtained with the NRAO Green Bank Telescope (GBT) and the MPHR Effelsberg telescope. Utilizing the K band receivers of these two 100m radio telescopes, we detect the CO(1-0) transition in the high-redshift QSOs BR1202-0725 (z = 4.7), PSSJ2322+1944 (z = 4.1),and APM08279+5255 (z = 3.9). From LVG models based on our observations out to z = 4.7, we derive that the CO emission from all observed transitions can be described by a single gas component, and that all molecular gas appears to be concentrated in a compact nuclear region. The spectral capabilities of the GBT (1 x 200MHz in high-resolution mode, 2 x 800MHz in high-bandwidth mode) allow us to cover velocity ranges of up to 22,000 km s~(-1), or △z/z = 0. 09 at z = 4, which will be imperative for future high-z studies in galaxies with known strong dust continuum but poorly constrained redshift. This is a first step towards observations with future z-machines.
机译:分子气体已经在15号Z被检测到。> 2,通过使用毫米波干涉高-J CO转变观测类星体。的CO基态跃迁CO(1-0)的观测,但是,必须跟踪分子气体在较低的激励,这可以给予总分子量气体的更好的估计,高Z类星体的内容的可能性。这里,我们提出的第一Z>与NRAO绿岸望远镜(GBT)和MPHR Effelsberg望远镜得到4 CO(1-0)观测。利用这两个百米无线电望远镜的K频接收器,我们检测CO(1-0)在高红移类星体BR1202-0725过渡(Z = 4.7),PSSJ2322 + 1944(Z = 4.1),和APM08279 + 5255 (Z = 3.9)。基于我们的观察出到z = 4.7 LVG模型,我们推导出从所有观察到的转换来CO排放可以由单个气体成分进行描述,并且所有的分子气体似乎集中在一个紧凑的区域核。的GBT(1高分辨率模式X 200MHz的,在高带宽模式2×800MHz的)的频谱的能力使我们可以达到22000公里S〜(-1)的盖速度范围,或△Z / Z = 0在z = 4,这将是必要的用于与已知的强灰尘连续星系未来高-Z研究,但约束较差红移。09。这是迈向未来的z机观察的第一步。

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