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arXiv 0905.0909astro-ph.COastro-ph.GA
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E+A和星暴后星系的作用- II。光谱能量分布及与观测值的比较

The role of E+A and post-starburst galaxies - II. Spectral energy distributions and comparison with observations

M. A. Falkenberg, R. Kotulla, U. Fritze

摘要:

在之前的论文(Falkenberg,Kotulla & Fritze 2009,arXiv:0901.1665)中,我们已经证明了E+A星系的经典定义排除了大量的后星暴星系。我们建议,分析宽带光谱能量分布(SED)是一个更全面的方法来选择和区分poststarburst星系比经典的定义测量等效宽度的(Hdelta)和[OII]线。在本文中,我们将仔细研究这种新方法,并通过比较我们的模型网格的后星暴星系观察到的E+A星系从MORPHS目录进行评估。我们发现,星暴后模型可以区分未受干扰的螺旋星系,S 0和E星系和星系在其星暴阶段的基础上,他们的SED。甚至可以通过它们的SED来区分大多数不同的后星爆。通过与观测结果的比较,我们发现MORPHS星表中所有观测到的E+A星系都可以与我们的模型相匹配。然而,只有恒星形成率下降时间尺度较短的模型才是观测到的E+A星系的可能场景,这与我们在第一篇论文中的结果一致(参见Falkenberg,Kotulla & Fritze 2009 a)。(节略)

英文摘要:

In a previous paper (Falkenberg, Kotulla & Fritze 2009, arXiv:0901.1665) we have shown that the classical definition of E+A galaxies excludes a significant number of post-starburst galaxies. We suggested that analysing broad-band spectral energy distributions (SEDs) is a more comprehensive method to select and distinguish poststarburst galaxies than the classical definition of measuring equivalent widths of (Hdelta) and [OII] lines. In this paper we will carefully investigate this new method and evaluate it by comparing our model grid of post-starburst galaxies to observed E+A galaxies from the MORPHS catalog. We find that the post-starburst models can be distinguished from undisturbed spiral, S0 and E galaxies and galaxies in their starburst phase on the basis of their SEDs. It is even possible to distinguish most of the different post-starburst by their SEDs. From the comparison with observations we find that all observed E+A galaxies from the MORPHS catalog can be matched by our models. However only models with short decline timescales for the star formation rate are possible scenarios for the observed E+A galaxies in agreement with our results from the first paper (see Falkenberg, Kotulla & Fritze 2009a). (abridged)

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