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arXiv 1902.09435astro-ph.GA
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恒星形成星系的衰减曲线是什么?

Which attenuation curves for star-forming galaxies?

Buat, V., Corre, D., Boquien, M., Malek, K

摘要:

尘埃衰减塑造了星系的光谱能量分布,其光谱能量分布的任何建模和拟合程序都必须考虑到这一过程。我们提出了最近的两项工作的结果,致力于测量尘埃衰减曲线在恒星形成星系的红移从0.5到3,通过拟合连续(光度)和线(光谱)测量同时与CIGALE使用可变衰减规律的基础上灵活的食谱。两项研究都得出了各种各样的有效衰减规律,当遮蔽增加时,衰减规律变平。星云谱线有一个额外的衰减。与辐射转移模型的比较意味着近红外波长的衰减规律的平坦化,这是很好地再现了受Charlot和Fall配方启发的幂律配方。在这里,我们提出了一个全球性的修改Calzetti衰减定律,以更好地再现辐射转移模型的结果。

英文摘要:

Dust attenuation shapes the spectral energy distributions of galaxies and any modelling and fitting procedure of their spectral energy distributions must account for this process. We present results of two recent works dedicated at measuring the dust attenuation curves in star forming galaxies at redshift from 0.5 to 3, by fitting continuum (photometric) and line (spectroscopic) measurements simultaneously with CIGALE using variable attenuation laws based on flexible recipes. Both studies conclude to a large variety of effective attenuation laws with an attenuation law flattening when the obscuration increases. An extra attenuation is found for nebular lines. The comparison with radiative transfer models implies a flattening of the attenuation law up to near infrared wavelengths, which is well reproduced with a power-laws recipe inspired by the Charlot and Fall recipe. Here we propose a global modification of the Calzetti attenuation law to better reproduce the results of radiative transfer models.

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