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Predictions for the intrinsic UV continuum properties of star-forming galaxies and the implications for inferring dust extinction.

机译:预测恒星形成星系固有的UV连续谱特性及其对粉尘灭绝的影响。

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摘要

The observed ultraviolet continuum (UVC) slope is potentially a powerful diagnostic of dust obscuration in star-forming galaxies. However, the intrinsic slope is also sensitive to the form of the stellar initial mass function and to the recent star formation and metal enrichment histories of a galaxy. Using the GALFORM semi-analytical model of galaxy formation, we investigate the intrinsic distribution of UVC slopes. For star-forming galaxies, we find that the intrinsic distribution of UVC slopes at z= 0, parametrized by the power-law index β, has a standard deviation of σβ≃ 0.30. This suggests an uncertainty on the inferred ultraviolet (UV) attenuation of Afuv≃ 0.7 (assuming a Calzetti attenuation curve) for an individual object, even with perfect photometry. Furthermore, we find that the intrinsic UVC slope correlates with star formation rate, intrinsic UV luminosity, stellar mass and redshift. These correlations have implications for the interpretation of trends in the observed UVC slope with these quantities irrespective of the sample size or quality of the photometry. Our results suggest that in some cases the attenuation by dust has been incorrectly estimated.
机译:观测到的紫外线连续谱(UVC)斜率可能是诊断恒星形成星系中尘埃模糊的有力诊断工具。但是,本征斜率也对恒星初始质量函数的形式以及星系最近的恒星形成和金属富集历史敏感。使用星系形成的GALFORM半解析模型,我们研究了UVC斜率的固有分布。对于形成恒星的星系,我们发现由幂律指数β参数化的,z = 0时UVC斜率的固有分布具有σβ≃0.30的标准偏差。这表明,即使使用完美的光度法,对于单个物体推断的Afuv≃0.7的紫外线(UV)衰减(假设Calzetti衰减曲线)也不确定。此外,我们发现固有的UVC斜率与恒星形成率,固有的UV光度,恒星质量和红移相关。这些相关性对于解释具有这些数量的观察到的UVC斜率的趋势具有影响,而与样品大小或光度测定的质量无关。我们的结果表明,在某些情况下,粉尘的衰减已被错误估算。

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