论文标题
发现[CI] - 素，共同光明的星系：合并Galaxy NGC 6052的Alma观察结果
Discovery of a [CI]-faint, CO-bright Galaxy: ALMA Observations of the Merging Galaxy NGC 6052
论文作者
论文摘要
我们报告敏感[\ ion {c} {1}]〜$^3p_1 $ - $^3p_0 $和$^{12} $ co〜 $ j $ = 4--3观察附近的Galaxy Ngc 6052使用Morita（Atacama Compact）Alma的阵列。我们检测到NGC 6052北部的$^{12} $ co〜 $ j $ = 4--3，但是[\ ion {c} {1} {1}]〜$^3p_1 $ - $^3p_0 $未在[\ ion $^{12} $ co〜 $ j $ = 4--3行光度比为$〜\ sillsim0.07 $。根据光解离区域的模型，[\ ion {c} {1}]〜$^3p_1 $ - $^3p_0 $相对于$^{12} $ co〜 $ j $ = 4--3的异常弱点可以解释，如果螺母介质具有大于$ 10^5 \ \ cm，则可以解释是否大于$ 10^5 \ c。自然出现在NGC 6052中正在进行的合并过程中。它的[\ ion {C} {1}]这表明[\ ion {c} {1}]〜$^3p_1 $ - $^3p_0 $可能不是该星系中分子气体质量的可靠示踪剂。 NGC 6052是研究合并过程如何影响分子气体分布的独特实验室。
We report sensitive [\ion{C}{1}]~$^3P_1$--$^3P_0$ and $^{12}$CO~$J$=4--3 observations of the nearby merging galaxy NGC 6052 using the Morita (Atacama Compact) Array of ALMA. We detect $^{12}$CO~$J$=4--3 toward the northern part of NGC 6052, but [\ion{C}{1}]~$^3P_1$--$^3P_0$ is not detected with a [\ion{C}{1}]~$^3P_1$--$^3P_0$ to $^{12}$CO~$J$=4--3 line luminosity ratio of$~\lesssim0.07$. According to models of photodissociation regions, the unusual weakness of [\ion{C}{1}]~$^3P_1$--$^3P_0$ relative to $^{12}$CO~$J$=4--3 can be explained if the interstellar medium has a hydrogen density larger than $10^5\,{\rm cm}^{-3}$, conditions that might arise naturally in the ongoing merging process in NGC 6052. Its [\ion{C}{1}]~$^3P_1$--$^3P_0$ emission is also weaker than expected given the molecular gas mass inferred from previous measurements of $^{12}$CO~$J$=1--0 and $^{12}$CO~$J$=2--1. This suggests that [\ion{C}{1}]~$^3P_1$--$^3P_0$ may not be a reliable tracer of molecular gas mass in this galaxy. NGC 6052 is a unique laboratory to investigate how the merger process impacts the molecular gas distribution.
