arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.3961astro-ph.CO
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MAGPHYS:解释观测到的星系SED的公开可用工具

MAGPHYS: a publicly available tool to interpret observed galaxy SEDs

Elisabete da Cunha, Stephane Charlot, Loretta Dunne, Dan Smith, Kate Rowlands

摘要:

我们提出了一个简单的,物理动机的模型来解释一致的发射星系在紫外线,光学和红外波长。我们将该模型与贝叶斯方法相结合,以获得描述星系恒星含量、恒星形成活动和尘埃含量的关键参数的鲁棒统计约束。我们的模型现在可以通过用户友好的代码包MAGPHYS在www.iap.fr/magphys上公开获得。我们提出了一个应用程序,这个模型来解释一个样本的~1400本地(z<0.5)星系的H-ATLAS调查。我们发现,对于这些星系来说,主要由年龄超过1000万年的恒星提供动力的漫射星际介质约占总红外亮度的一半。我们讨论了这一结果的影响,使用恒星形成率指标的基础上,总红外光度。

英文摘要:

We present a simple, physically-motivated model to interpret consistently the emission from galaxies at ultraviolet, optical and infrared wavelengths. We combine this model with a Bayesian method to obtain robust statistical constraints on key parameters describing the stellar content, star formation activity and dust content of galaxies. Our model is now publicly available via a user-friendly code package, MAGPHYS at www.iap.fr/magphys. We present an application of this model to interpret a sample of ~1400 local (z<0.5) galaxies from the H-ATLAS survey. We find that, for these galaxies, the diffuse interstellar medium, powered mainly by stars older than 10 Myr, accounts for about half the total infrared luminosity. We discuss the implications of this result to the use of star formation rate indicators based on total infrared luminosity.

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