The effects of interactions on spiral galaxies. II - Disk star-formation rates
The effects of interactions on spiral galaxies. II - Disk star-formation rates
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DOI：
10.1086/114384
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发表时间：
1987-05
期刊：
影响因子：
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通讯作者：
R. Kennicutt;K. Roettiger;W. Keel;J. Hulst;E. Hummel
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文献类型：
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作者：
R. Kennicutt;K. Roettiger;W. Keel;J. Hulst;E. Hummel
本文利用相互作用的螺旋星系和不规则星系的H-α发射线和IRAS远红外观测来评估相互作用对其全球恒星形成率的影响。观测到了两个相互作用的星系样本：一个是近距离星系的完整样本，另一个是特殊星系的Arp图谱样本。与单个星系的对照样本相比，两个相互作用系统的样本平均显示出系统更高的H-α和红外发射水平，以及更大的发射性质离散。非常活跃的系统中的发射水平与相互作用的性质比与星系本身的内部性质更密切相关。强烈的圆盘发射几乎总是伴随着异常强烈的核活动。简单的恒星形成爆发模型可以再现观测到的大多数星系的H-α等宽和宽带颜色。爆发的时间相对较短(1000万年的几倍)，很少涉及超过星系总质量的1%-2%。参考文献56篇。
H-alpha emission-line and IRAS far-IR observations of interacting spiral and irregular galaxies are here used to assess the influence of interactions on their global star-formation rates. Two samples of interacting galaxies were observed: a complete sample of close pairs, and an Arp atlas sample of peculiar systems. When compared to a control sample of single galaxies, both samples of interacting systems exhibit systematically higher levels of H-alpha and infrared emission on average, and a larger dispersion in emission properties. Emission levels in the very active system are much more strongly correlated with the properties of the interaction than with the internal properties of the galaxies themselves. Strong disk emission is almost always accompanied by unusually strong nuclear activity. Simple star-formation burst models can reproduce the observed H-alpha equivalent widths and broadband colors of most of the galaxies. The bursts are relatively short (few times 10 million yr) and rarely involve more than 1-2 percent of a galaxy's total mass. 56 references.