A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2

A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2
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对 z > 2 引力透镜恒星形成星系中冷分子气体的调查

DOI:
10.1093/mnras/stw275
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发表时间:
2016
影响因子:
4.8
通讯作者:
Aravena M
Aravena M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Aravena M

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利用澳大利亚望远镜紧凑阵列,我们对南极望远镜(SPT)发现的强透镜高红移尘埃恒星形成星系(DSFG)进行了COJ= 1 − 0和J = 2 − 1谱线观测。我们的样本包括17个来源,有CO为基础的光谱红移获得的阿塔卡马大型毫米/亚毫米阵列和阿塔卡马探路者实验。我们探测所有已知红移在COJ= 1 − 0或J = 2 − 1范围内的源。在7 mm连续谱中检测到12个源。导出的CO光度值意味着气体质量在(0.5-11)× 1010 M <$m范围内,气体耗尽时间尺度estdep < 200 Myr,使用CO到气体质量的转换因子αCO= 0.8 M <$m(K km s− 1 pc 2)−1。结合CO光度和尘埃质量,沿着固定的气尘比,我们推导出α CO因子的范围为0.4-1.8 M⊙(K km s-1 pc 2)-1,与其他恒星爆发系统中发现的相似。我们发现样本中α CO值的分散性很小,尽管个别情况下灰尘和气体空间分布的固有变化可能会使基于灰尘的α CO估计值产生偏差。我们发现基于CO线宽与光度关系(μCO)的透镜放大因子是高度不可靠的,特别是当μ < 5时。最后,气体质量和动力学质量的比较表明,平均分子气体分数保持相对恒定,在SPT DSFG样品中的atz= 2-5。
Using the Australia Telescope Compact Array, we conducted a survey of COJ= 1 − 0 andJ= 2 − 1 line emission towards strongly lensed high-redshift dusty star-forming galaxies (DSFGs) previously discovered with the South Pole Telescope (SPT). Our sample comprises 17 sources that had CO-based spectroscopic redshifts obtained with the Atacama Large Millimeter/submillimeter Array and the Atacama Pathfinder Experiment. We detect all sources with known redshifts in either COJ= 1 − 0 orJ= 2 − 1. 12 sources are detected in the 7-mm continuum. The derived CO luminosities imply gas masses in the range (0.5–11) × 1010M⊙and gas depletion time-scalestdep< 200 Myr, using a CO to gas mass conversion factor αCO= 0.8 M⊙(K km s−1pc2)−1. Combining the CO luminosities and dust masses, along with a fixed gas-to-dust ratio, we derive αCOfactors in the range 0.4–1.8 M⊙(K km s−1pc2)−1, similar to what is found in other starbursting systems. We find small scatter in αCOvalues within the sample, even though inherent variations in the spatial distribution of dust and gas in individual cases could bias the dust-based αCOestimates. We find that lensing magnification factors based on the CO linewidth to luminosity relation (μCO) are highly unreliable, but particularly when μ < 5. Finally, comparison of the gas and dynamical masses suggest that the average molecular gas fraction stays relatively constant atz= 2–5 in the SPT DSFG sample.
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