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The Star Formation Rate-dense Gas Relation In Galaxies As Measured By Hcn(3-2) Emission

机译:用Hcn(3-2)发射法测量星系中恒星形成率与气体密度的关系

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摘要

We present observations made with the 10 m Heinrich Hertz Submillimeter Telescope of HCN(3-2) emission from a sample of 30 nearby galaxies ranging in infrared luminosity from 10~(10) to 10~(12.5) solar luminosity and HCN(3-2) luminosity from 10~6 to 10~9 K km s~(-1) pc~2. We examine the correlation between the infrared luminosity and HCN(3-2) luminosity and find that the best-fit linear regression has a slope (in log-log space) of 0.74 ± 0.12. Including recently published data from Gracia-Carpio et al. tightens the constraints on the best-fit slope to 0.79 ± 0.09. This slope below unity suggests that the HCN(3-2) molecular line luminosity is not linearly tracing the amount of dense gas. Our results are consistent with predictions from recent theoretical models that find slopes below unity when the line luminosity depends on the average gas density with a power-law index greater than a Kennicutt-Schmidt index of 1.5.
机译:我们提出了用10 m Heinrich Hertz亚毫米望远镜对HCN(3-2)发射的观测结果,该样本来自30个附近星系的样本,其红外光度从10〜(10)到10〜(12.5)太阳光度和HCN(3- 2)光度从10〜6到10〜9 K km s〜(-1)pc〜2。我们检查了红外发光度和HCN(3-2)发光度之间的相关性,发现最佳拟合线性回归的斜率(在对数对数空间中)为0.74±0.12。包括Gracia-Carpio等人最近发布的数据。将最佳拟合斜率上的约束拧紧到0.79±0.09。低于1的斜率表明HCN(3-2)分子线的光度不是线性地跟踪致密气体的量。我们的结果与最新理论模型的预测一致,当线的亮度取决于平均气体密度且幂律指数大于Kennicutt-Schmidt指数1.5时,该理论发现斜率低于1。

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