Molecular Gas Distribution in Barred and Nonbarred Galaxies along the Hubble Sequence
Molecular Gas Distribution in Barred and Nonbarred Galaxies along the Hubble Sequence
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DOI：
10.1086/590469
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
S. Komugi;Y. Sofue;K. Kohno;H. Nakanishi;S. Onodera;F. Egusa;K. Muraoka
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文献类型：
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作者：
S. Komugi;Y. Sofue;K. Kohno;H. Nakanishi;S. Onodera;F. Egusa;K. Muraoka
我们给出了用Nobeama射电天文台45m望远镜对68个附近星系中心区的12Co(J=1-0)谱进行测量的结果，这些谱的角分辨率为16“，目的是表征恒星形成分子气体的性质。结合文献中类似分辨率的观测，汇编的166个星系样本集涵盖了广泛的星系属性。检测到了以前在CO中未检测到的NGC 4380。这一系列的第一篇论文将集中于样本的数据和气体性质，特别是从早期(S0/Sa)到晚期(Sd/Sm)有棒和无棒的早期(S0/Sa)到晚期(Sd/Sm)星系中分子气体的中心集中程度。与星系中心几千帕秒的分子中心集中度相比，分子中心集中度随哈勃类型的变化是平稳的，因此早期类型星系的中心集中度较大。对早期和晚期星系中的条状星系和非条状星系的比较表明，哈勃类型的差异是比条状星系更重要的将气体集中到中心区域的因素。哈勃类型代表了凸起的影响。
We present results from a survey of 12CO (J = 1–0) spectra obtained for the central regions of 68 nearby galaxies at an angular resolution of 16″ using the Nobeyama Radio Observatory 45 m telescope, aimed at characterizing the properties of star-forming molecular gas. Combined with observations of similar resolution in the literature, the compiled sample set of 166 galaxies span a wide range of galactic properties. NGC 4380, which was previously undetected in CO, was detected. This initial paper of a series will focus on the data and the gaseous properties of the samples, and particularly on the degree of central concentration of molecular gas in a range of morphological types, from early (S0/Sa) to late (Sd/Sm) galaxies with and without bars. The degree of molecular central concentration in the central kiloparsec, compared with the central several kiloparsecs of galaxies, is found to vary smoothly with Hubble type, so that early-type galaxies show larger central concentration. The comparison of barred and nonbarred galaxies within early- and late-type galaxies suggest that difference in Hubble type, representing the effect of bulges, is the more important factor in concentrating gas into the central regions than bars.