Dense Molecular Gas in Lenticular Galaxies
Dense Molecular Gas in Lenticular Galaxies
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DOI：
10.1093/pasj/54.4.555
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发表时间：
2002-06
影响因子：
2.3
通讯作者：
N. Kuno;N. Nakai;K. Sorai;K. Nishiyama;B. Vila-Vlaro
中科院分区：
文献类型：
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作者：
N. Kuno;N. Nakai;K. Sorai;K. Nishiyama;B. Vila-Vlaro
我们对透镜星系NGC 404、NGC 3593和NGC 4293进行了CO和HCN的同步观测，在NGC 3593和NGC 4293中探测到HCN的发射，在所有星系中探测到CO。NGC 3593和NGC 4293的IHCN/ICO比值分别为0.025 ±0.006和0.066 ±0.005，与晚型旋涡星系相当。包括晚型在内的12个邻近旋涡星系中心的IHCN/ICO比值的平均值为0.055 ±0.028。CO和HCN发射的谱线轮廓在两个星系中呈现出不同的形状。HCN峰不在这些星系的系统速度处，而CO峰则在系统速度附近。这些结果表明，在这些星系的中心周围，致密分子气体的比例很高。
We made CO and HCN simultaneous observations of lenticular galaxies (NGC 404, NGC 3593, and NGC 4293) and detected HCN emission in NGC 3593 and NGC 4293 as well as CO in all the galaxies. The IHCN/ICO ratios were 0.025 ±0.006 and 0.066 ±0.005 in NGC 3593 and NGC 4293, respectively, which are comparable to that of late-type spiral galaxies. The average of the IHCN/ICO ratios at the center of 12 nearby spiral galaxies including the late type was 0.055 ±0.028. The line profiles of CO and HCN emission showed different shape in both galaxies. The HCN peaks were not at the systemic velocity of these galaxies, while the CO peaks were near the systemic velocity. These results suggest that the fraction of dense molecular gas is high around the center of these galaxies.