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arXiv 1402.4908astro-ph.GAastro-ph.CO
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螺旋半导体圆盘形貌的环境依赖性

Environment Dependence of Disk Morphology of Spiral Galaxies

H. B. Ann

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13 pages, 14 figures
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摘要：

我们使用局部背景密度（$Σ_{n}$）、投影距离（$r_{p}$）和潮汐指数（$TI$）作为环境的度量，分析了邻近旋涡星系盘形态（臂类、哈勃型、棒型）对星系环境的依赖性。有一个强烈的依赖性的臂类和哈勃类型的星系环境，而酒吧型表现出弱的依赖性，在高密度区的SB星系的频率高。随着$Σ_{n}$、$1/r_{p}$和$TI$的增加，大设计分数和早型分数增加，而絮状螺旋和晚型螺旋分数减少。多臂和中间型螺旋表现出几乎恒定的分数与弱趋势类似的大设计和早期型螺旋。虽然酒吧类型只显示一个边际依赖于$Σ_{n}$，他们显示了一个相当明显的依赖于$r_{p}$与高频率的SB星系在小$r_{p}$。臂类与$r_{p}$的相关性也强于$Σ_{n}$和$TI$，而Hubble型与$Σ_{n}$和$r_{p}$的相关性相似。这表明臂类主要受最近邻星系的影响，而哈勃类型则受邻近星系和最近邻星系贡献的局部密度的影响。

英文摘要：

We analyze the dependence of disk morphology (arm class, Hubble type, bar type) of nearby spiral galaxies on the galaxy environment by using local background density ($Σ_{n}$), projected distance ($r_{p}$), and tidal index ($TI$) as measures of the environment. There is a strong dependence of arm class and Hubble type on the galaxy environment, while the bar type exhibits a weak dependence with a high frequency of SB galaxies in high density regions. Grand design fractions and early-type fractions increase with increasing $Σ_{n}$, $1/r_{p}$, and $TI$, while fractions of flocculent spirals and late-type spirals decrease. Multiple-arm and intermediate-type spirals exhibit nearly constant fractions with weak trends similar to grand design and early-type spirals. While bar types show only a marginal dependence on $Σ_{n}$, they show a fairly clear dependence on $r_{p}$ with a high frequency of SB galaxies at small $r_{p}$. The arm class also exhibits a stronger correlation with $r_{p}$ than $Σ_{n}$ and $TI$, whereas the Hubble type exhibits similar correlations with $Σ_{n}$ and $r_{p}$. This suggests that the arm class is mostly affected by the nearest neighbor while the Hubble type is affected by the local densities contributed by neighboring galaxies as well as the nearest neighbor.

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