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arXiv 1004.1507astro-ph.CO
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盘星系的标度长度

Scalelength of disc galaxies

Kambiz Fathi, Mark Allen, Thomas Boch, Evanthia Hatziminaoglou, Reynier Peletier

摘要:

我们推导出30374个非相互作用盘星系在所有五个SDSS波段的盘尺度长度。虚拟天文台的方法和工具被用来定义,检索和分析这个前所未有的大样本分类为盘/螺旋星系的LEDA目录中的图像。交叉相关的SDSS样本与LEDA目录允许我们调查的不同类型的盘/螺旋星系的尺度长度的变化。我们进一步将不对称性、浓度和中心速度色散作为形态类型的指标,并能够评估尺度长度如何随星系类型而变化。然而,我们注意到,浓度和不对称参数必须谨慎使用时,调查类型依赖的星系结构参数。在这里,我们提出的尺度长度推导方法和大量的测试,我们已经进行了调查,我们的结果的可靠性。平均r-波段盘尺度长度为3.79千秒差距,RMS色散为2.05千秒差距,这是一个典型的值,无论通带和星系形态,浓度和不对称性。推导出的尺度长度在这里是代表一个典型的星系质量$10^{10.8\pm 0.54} \rm{M}_\odot$,和RMS色散更大的质量更大的星系。在所有其他SDSS频带中也导出了标度长度的分布和典型趋势,其线性关系指示将一个通带中的标度长度连接到另一个通带中的关系。这种转换可以用来测试即将到来的星系形成和哈勃序列演化的宇宙学模拟结果。

英文摘要:

We have derived disk scale lengths for 30374 non-interacting disk galaxies in all five SDSS bands. Virtual Observatory methods and tools were used to define, retrieve, and analyse the images for this unprecedentedly large sample classified as disk/spiral galaxies in the LEDA catalogue. Cross correlation of the SDSS sample with the LEDA catalogue allowed us to investigate the variation of the scale lengths for different types of disk/spiral galaxies. We further investigat asymmetry, concentration, and central velocity dispersion as indicators of morphological type, and are able to assess how the scale length varies with respect to galaxy type. We note however, that the concentration and asymmetry parameters have to be used with caution when investigating type dependence of structural parameters in galaxies. Here, we present the scale length derivation method and numerous tests that we have carried out to investigate the reliability of our results. The average r-band disk scale length is 3.79 kpc, with an RMS dispersion of 2.05 kpc, and this is a typical value irrespective of passband and galaxy morphology, concentration, and asymmetry. The derived scale lengths presented here are representative for a typical galaxy mass of $10^{10.8\pm 0.54} \rm{M}_\odot$, and the RMS dispersion is larger for more massive galaxies. Distributions and typical trends of scale lengths have also been derived in all the other SDSS bands with linear relations that indicate the relation that connect scale lengths in one passband to another. Such transformations could be used to test the results of forthcoming cosmological simulations of galaxy formation and evolution of the Hubble sequence.

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