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arXiv 2105.08166astro-ph.GA
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星云尘埃衰减曲线随局部成星星系团性质的变化

Variation of the Nebular Dust Attenuation Curve with the Properties of Local Star-forming Galaxies

Saeed Rezaee, Naveen Reddy, Irene Shivaei, Tara Fetherolf, Najmeh Emami, AliAhmad Khostovan

摘要:

我们利用SDSS DR 8巡天中位于$z\simeq 0.04-0.1$的$78,340$恒星形成星系样本,计算了星云尘埃的平均衰减曲线及其随星系物理性质的变化。利用前四条低阶巴耳末辐射线(H $α$,H $β$,H $γ$,H $δ$),得到了$0.41\,μ$ m ~ $0.66\,μ$ m范围内的星云衰减曲线,它与银河系消光曲线具有相似的形状和归一化(Milky Way curve)、最近导出的$z\sim2$典型成星星系的SMC曲线和星云衰减曲线。我们将星系划分成恒星质量,气相金属丰度和特定恒星形成率的箱,并推导出这些箱中的星云衰减曲线。这一分析表明,有非常小的变化,在形状的星云尘埃衰减曲线的属性用于bin的星系,并建议一个几乎普遍的形状的星云尘埃衰减曲线至少在星系和我们的样本中考虑的属性范围。

英文摘要:

We use a sample of $78,340$ star-forming galaxies at $z\simeq 0.04-0.1$ from the SDSS DR8 survey to calculate the average nebular dust attenuation curve and its variation with the physical properties of galaxies. Using the first four low-order Balmer emission lines (H$α$, H$β$, H$γ$, H$δ$) detected in the composite spectrum of all galaxies in the sample, we derive a nebular attenuation curve in the range of $0.41\,μ$m to $0.66\,μ$m that has a similar shape and normalization to that of the Galactic extinction curve (Milky Way curve), the SMC curve and the nebular attenuation curve derived recently for typical star-forming galaxies at $z\sim2$. We divide the galaxies into bins of stellar mass, gas-phase metallicity, and specific star-formation rate, and derive the nebular attenuation curve in each of these bins. This analysis indicates that there is very little variation in the shape of the nebular dust attenuation curve with the properties used to bin the galaxies, and suggests a near universal shape of the nebular dust attenuation curve at least among the galaxies and the range of properties considered in our sample.

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