Dense gas star formation efficiency and the LHCN (4−3)′/LHCO+(4−3)′ ratio: insights from a statistical study of infrared bright star-forming galaxies
Dense gas star formation efficiency and the LHCN (4−3)′/LHCO+(4−3)′ ratio: insights from a statistical study of infrared bright star-forming galaxies
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DOI：
10.3389/fspas.2023.1246978
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发表时间：
2023-10
影响因子：
3
通讯作者：
Qian Jiao;Yu Gao;Q. Tan;Yang Gao
中科院分区：
文献类型：
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作者：
Qian Jiao;Yu Gao;Q. Tan;Yang Gao
我们对 26 个红外亮恒星形成 (SF) 星系样本的 HCN (4-3)、HCO+ (4-3) 线的致密分子气体示踪剂和 [C i] 分子示踪剂以及 CO 观测进行了统计研究。我们研究了由 HCN (4–3)、HCO+ (4–3)（即 LIR/LHCN (4-3)' 和 LIR/LHCO+(4−3)'）追踪的致密气体恒星形成效率以及 LHCN (4-3)'/LHCO+(4−3)' 的光度比对 L[C I] (1-0)'/LCO 的 [C i]-CO 比率的依赖性(1-0)'、L[C I] (2-1)'/LCO (1-0)' 和 L[C I] (2-1)'/L[C I] (1-0)' (以下简称 R[CI]) 对星际介质条件敏感。我们的研究结果表明，LIR/LHCN (4-3)' 和 LIR/LHCO+(4−3)' 与 L[C I] (2-1)'/LCO (1-0)' 和 R[CI] 具有中等相关性，而 LHCN (4-3)'/LHCO+(4−3)' 与任何 [C i]-CO 比率没有显示出任何显着相关性。我们比较了 AGN 和 SF 星系的 LHCN (4-3)′/LHCO+(4−3)′ 比率，发现虽然较高的 LHCN (4-3)′/LH<mml:mi mathvariant="n
We present a statistical study on dense molecular gas tracers of HCN (4–3), HCO+ (4–3) lines and molecular tracers of [C i], and CO observations for a sample of 26 infrared bright star-forming (SF) galaxies. We investigate the dependence of dense gas star formation efficiency traced by HCN (4–3), HCO+ (4–3) (that is LIR/LHCN (4-3)′, and LIR/LHCO+(4−3)′), and luminosity ratio of LHCN (4-3)′/LHCO+(4−3)′ on [C i]-CO ratios of L[C I] (1-0)′/LCO (1-0)′, L[C I] (2-1)′/LCO (1-0)′ and L[C I] (2-1)′/L[C I] (1-0)′ (hereafter R[CI]) which are sensitive to interstellar medium conditions. Our findings show that both LIR/LHCN (4-3)′ and LIR/LHCO+(4−3)′ have moderate correlations with L[C I] (2-1)′/LCO (1-0)′ and R[CI], while LHCN (4-3)′/LHCO+(4−3)′ does not show any significant correlations with any of the [C i]-CO ratios. We compare the LHCN (4-3)′/LHCO+(4−3)′ ratios of AGN and SF galaxies, and find that although the higher LHCN (4-3)′/LH<mml:mi mathvariant="n