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arXiv 2109.05039astro-ph.GA
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倾斜相关衰减对恒星形成历史的影响:来自大天文台盘状星系的结果

On the Impact of Inclination-Dependent Attenuation on Derived Star Formation Histories: Results from Disk Galaxies in the Great Observatories Origins Deep Survey Fields

Keith Doore, Rafael T. Eufrasio, Bret D. Lehmer, Erik B. Monson, Antara Basu-Zych, Kristen Garofali, Andrew Ptak

摘要:

我们开发和实施的光谱能量分布(SED)拟合和研究其对派生的恒星形成历史的影响依赖于倾角的衰减处方。我们应用我们的处方内的SED拟合代码闪电的一个干净的样本82,z=0.21-1.35盘为主的星系在大天文台起源深调查南北领域。为了将我们的倾斜相关衰减处方与更传统的拟合处方进行比较,我们还使用与倾斜无关的Calzetti等人(2000)衰减曲线拟合SED。从这个比较中,我们发现,在我们的样本中的一个子集的58,z < 0.7星系,利用Calzetti等人(2000)的处方,恢复类似的趋势与倾角依赖拟合的远紫外波段衰减和最近的恒星形成率。然而,我们发现处方之间的光学衰减(AV)差异与倾斜度密切相关(p值< 10^-11)。对于更多的正面星系,i < 50度,(边缘上,i = 90度),平均推导出的AV是0.31 +\- 0.11等低(0.56 +\- 0.16等高)的倾角依赖模型相比,传统的方法。此外,恒星质量的比值也随倾角的变化而呈现出显著的趋势(p值< 10^-2)。对于i = 0-65 deg,恒星质量在拟合之间是系统一致的,log(Mstar_inc/Mstar_Calzetti)= -0.05 +/- 0.03 dex,分散度为0.11 dex。然而,对于i = 80-90 deg,Calzetti等人(2000年)拟合的恒星质量较低,平均因子为0.17 ± 0.03 dex,分散度为0.13 dex。因此,这些结果表明,假设Calzetti等人(2000)衰减定律的SED拟合可能低估了高度倾斜盘主导星系中的恒星质量。

英文摘要:

We develop and implement an inclination-dependent attenuation prescription for spectral energy distribution (SED) fitting and study its impact on derived star-formation histories. We apply our prescription within the SED fitting code Lightning to a clean sample of 82, z=0.21-1.35 disk-dominated galaxies in the Great Observatories Origins Deep Survey North and South fields. To compare our inclination-dependent attenuation prescription with more traditional fitting prescriptions, we also fit the SEDs with the inclination-independent Calzetti et al. (2000) attenuation curve. From this comparison, we find that fits to a subset of 58, z < 0.7 galaxies in our sample, utilizing the Calzetti et al. (2000) prescription, recover similar trends with inclination as the inclination-dependent fits for the far-UV-band attenuation and recent star-formation rates. However, we find a difference between prescriptions in the optical attenuation (AV) that is strongly correlated with inclination (p-value < 10^-11). For more face-on galaxies, with i < 50 deg, (edge-on, i = 90 deg), the average derived AV is 0.31 +\- 0.11 magnitudes lower (0.56 +\- 0.16 magnitudes higher) for the inclination-dependent model compared to traditional methods. Further, the ratio of stellar masses between prescriptions also has a significant (p-value < 10^-2) trend with inclination. For i = 0-65 deg, stellar masses are systematically consistent between fits, with log(Mstar_inc/Mstar_Calzetti) = -0.05 +/- 0.03 dex and scatter of 0.11 dex. However, for i = 80-90 deg, derived stellar masses are lower for the Calzetti et al. (2000) fits by an average factor of 0.17 +\- 0.03 dex and scatter of 0.13 dex. Therefore, these results suggest that SED fitting assuming the Calzetti et al. (2000) attenuation law potentially underestimates stellar masses in highly inclined disk-dominated galaxies.

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