S0-Scd星系反截断星盘的光度标度关系
Photometric scaling relations of antitruncated stellar discs in S0-Scd galaxies
摘要：
最近发现S 0星系反截盘的特征光度参数遵循紧标度关系。我们调查，如果类似的标度关系满足其他形态类型的星系。我们分析了几个光度平面的趋势有关的特征表面亮度和scalelands的休息和内部和外部光盘的本地antristuncated S 0-Scd星系，使用已公布的数据和拟合进行的表面亮度轮廓的两个样本的III型星系在R和斯皮策3.6微米波段。我们对每个平面上不同星系类型的相关性进行了线性拟合，并进行了几次统计检验以确定其重要性。我们发现：（1）从Sa到Scd的所有类型星系的反截盘在R和3.6 μ m尺度上都服从严格的标度关系，如在S 0 s中所观察到的那样，（2）这些相关性中的大多数对于可用的数据样本数是显著的，（3）当特征标度标度标（4）当特征标度归一化为星系的光学半径时，内外盘特征表面亮度和破裂点与各特征标度的相关性显著提高。结果表明，III型光盘的标度关系是独立的形态类型和存在（或不存在）的酒吧内的观测不确定性的现有数据集，虽然更大，更深的样本需要确认这一点。这些标度关系所暗示的紧密结构耦合，对解释整个哈勃序列星系中反截顶星盘形成的机制施加了强有力的约束。
英文摘要：
It has been recently found that the characteristic photometric parameters of antitruncated discs in S0 galaxies follow tight scaling relations. We investigate if similar scaling relations are satisfied by galaxies of other morphological types. We have analysed the trends in several photometric planes relating the characteristic surface brightness and scalelengths of the breaks and the inner and outer discs of local antitruncated S0-Scd galaxies, using published data and fits performed to the surface brightness profiles of two samples of Type-III galaxies in the R and Spitzer 3.6 microns bands. We have performed linear fits to the correlations followed by different galaxy types in each plane, as well as several statistical tests to determine their significance. We have found that: 1) the antitruncated discs of all galaxy types from Sa to Scd obey tight scaling relations both in R and 3.6 microns, as observed in S0s; 2) the majority of these correlations are significant accounting for the numbers of the available data samples; 3) the trends are clearly linear when the characteristic scalelengths are plotted on a logarithmic scale; and 4) the correlations relating the characteristic surface brightnesses of the inner and outer discs and the breaks with the various characteristic scalelengths significantly improve when the latter are normalized to the optical radius of the galaxy. The results suggest that the scaling relations of Type-III discs are independent of the morphological type and the presence (or absence) of bars within the observational uncertainties of the available datasets, although larger and deeper samples are required to confirm this. The tight structural coupling implied by these scaling relations impose strong constraints on the mechanisms proposed for explaining the formation of antitruncated stellar discs in the galaxies across the whole Hubble Sequence (Abridged).
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