宇宙恒星形成史的再认识--对尘埃修正和恒星形成率换算中不确定性的警示
Revisiting the Cosmic Star Formation History: Caution on the Uncertainties in Dust Correction and Star Formation Rate Conversion
摘要：
宇宙星形成率密度（CSFRD）已观测到红移z~10.然而，大多数星系形成的理论模型都低估了z>1时的CSFRD。由于理论模型再现了观测到的光度函数（LF）、光度密度（LD）和恒星质量密度在每个红移，这种不一致并不意味着理论模型应该包含一些缺失的星系形成的未知物理过程。在这里，我们研究这种不一致的紫外线波长的原因，通过使用一个半解析模型的星系形成所产生的星系模拟目录。我们发现，这种不一致性是由于两个观测的不确定性：尘埃遮蔽校正和转换从紫外光度恒星形成率（SFR）。与直接从我们的模拟星表中获得的结果相比，观测研究中使用的遮蔽校正和SFR转换方法分别导致CSFRD的高估~ 0.1-0.3 dex和~ 0.1-0.2 dex。我们提出了新的经验校准灰尘衰减和转换从观察到的紫外线LF和LD到CSFRD。
英文摘要：
The cosmic star formation rate density (CSFRD) has been observationally investigated out to redshift z~10. However, most of theoretical models for galaxy formation underpredict the CSFRD at z>1. Since the theoretical models reproduce the observed luminosity functions (LFs), luminosity densities (LDs), and stellar mass density at each redshift, this inconsistency does not simply imply that theoretical models should incorporate some missing unknown physical processes in galaxy formation. Here, we examine the cause of this inconsistency in UV wavelengths by using a mock catalog of galaxies generated by a semi-analytic model of galaxy formation. We find that this inconsistency is due to two observational uncertainties: dust obscuration correction and conversion from UV luminosity to star formation rate (SFR). The methods for correction of obscuration and SFR conversion used in observational studies result in the overestimation of CSFRD by ~ 0.1-0.3 dex and ~ 0.1-0.2 dex, respectively, compared to the results obtained directly from our mock catalog. We present new empirical calibrations for dust attenuation and conversion from observed UV LFs and LDs into CSFRD.
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