论文标题
光谱能量分布和星系形态如何相互约束，并使用星系颜色应用形态选择
How the spectral energy distribution and galaxy morphology constrain each other, with application to morphological selection using galaxy colours
论文作者
论文摘要
我们介绍了一种经验方法，以研究光谱能量分布（SED）和星系形态如何相互限制，并在商品南部的HST烛台调查中对8000个星系进行实施。我们表明，SED确实限制了形态，并提出了一种量化这两个数量之间联系强度的方法。两个具有非常相似SED的星系在形态上相似的可能性也高三倍，而SED的形态最为强，对于相对较大的红色椭圆形。我们应用方法来探索使用颜色的形态选择功效的上限。我们表明，在合理的假设下，颜色选择在分离均匀形态时相对无效。即使使用多达六种颜色用于形态学选择，最终形态学类别的平均纯度也仅约为60％。虽然可以通过使用整个SED来改善结果，但增益并不显着，纯度值持续约70％或以下。
We introduce an empirical methodology to study how the spectral energy distribution (SED) and galaxy morphology constrain each other and implement this on 8000 galaxies from the HST CANDELS survey in the GOODS-South field. We show that the SED does constrain morphology and present a method that quantifies the strength of the link between these two quantities. Two galaxies with very similar SEDs are around three times more likely to also be morphologically similar, with SED constraining morphology most strongly for relatively massive red ellipticals. We apply our methodology to explore likely upper bounds on the efficacy of morphological selection using colour. We show that, under reasonable assumptions, colour selection is relatively ineffective at separating homogeneous morphologies. Even with the use of up to six colours for morphological selection, the average purity in the resultant morphological classes is only around 60 per cent. While the results can be improved by using the whole SED, the gains are not significant, with purity values remaining around 70 per cent or below.
