致密气体恒星形成效率和LHCN(4−3)' /LHCO+(4−3)'比值:来自红外明亮恒星形成星系统计研究的见解

IF 2.6 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Frontiers in Astronomy and Space Sciences Pub Date : 2023-10-03 DOI:10.3389/fspas.2023.1246978

Qian Jiao, Yu Gao, Qinghua Tan, Yang Gao

引用次数: 0

摘要

本文对26个红外明亮恒星形成(SF)星系的HCN(4-3)、HCO +(4-3)谱线的致密分子气体示踪剂和[C i]的分子示踪剂进行了统计研究，并对CO观测结果进行了分析。我们研究了HCN(4-3)、HCO+(4 -3)(即LIR/LHCN(4-3) '和LIR/LHCO+(4 -3) ')和LHCN(4-3) '的光度比对星际介质条件敏感的L[C i] (1-0) ' /LCO(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])的[C i]-CO比值的依赖关系。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[CI] -CO比值均无显著相关性。我们比较了AGN和SF星系的LHCN(4-3)′/LHCO+(4−3)′比值，发现虽然较高的LHCN(4-3)′/LHCO+(4−3)′比值主要出现在AGN中，但SF星系的LHCN(4-3)′/LHCO+(4−3)′值与AGN中的大部分LHCN(4-3)′值相当。根据我们的研究结果，LHCN (4-3) ' /LHCO+(4 -3) '比率可能不是AGN存在的可靠指标，尽管需要进一步的研究来证实这一结论。

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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

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)′/LHCO+(4−3)′ ratios are mainly found in AGN, the majority of the LHCN (4-3)′/LHCO+(4−3)′ values in SF galaxies are comparable to those in AGN. Based on our findings, it appears that the LHCN (4-3)′/LHCO+(4−3)′ ratio may not be a reliable indicator of the presence of an AGN, although further investigation is needed to confirm this conclusion.

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来源期刊

Frontiers in Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-

CiteScore

3.40

自引率

13.30%

发文量

363

审稿时长

14 weeks