论文标题
Z $ \ sim $ 0.8的灰尘衰减曲线来自lega-c：斜坡上的精确约束和2175 $Å$ bump强度
Dust Attenuation Curves at z $\sim$ 0.8 from LEGA-C: Precise Constraints on the Slope and 2175$Å$ Bump Strength
论文作者
论文摘要
We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M$_*$ $>$ 10$^{10}$ M$_{\odot}$ based on deep optical spectra from the VLT/VIMOS LEGA-C survey and multi-band photometry in the COSMOS field.最重要的是，我们发现其余框架的衰减曲线$ 3000-4500 $通常几乎是银河系，LMC，SMC和Calzetti衰减曲线的陡峭的两倍，这与最近对当今星系综合光的研究一致。 $ 4500 $ A的衰减和斜率与星系倾斜密切相关：与边缘星系相比，面对面的星系显示出更少的衰减和陡峭的曲线，这表明几何效应占据了衰减的观察到的变化。我们的新方法可为260个单独的星系产生$ 2175 $ A UV BUMP检测。即使没有紫外线凹凸强度与全球星系属性之间的明显相关性，但最常见于面对面的较低质量星系（10 $ <$ log $ _ {10} $（m $ _*$ _*$ _*$ _ $ _ {\ odot} $ 10.5）$ <$ <$ 10.5），其整体可及其整体可及其整体可纳）。最后，我们以$ z \ sim0.8 $的形式生成了一个典型的星形星系衰减曲线；该处方比常用的衰减定律更准确地代表了灰尘对高红色星系综合光谱能量分布的影响。
We present a novel approach to measure the attenuation curves of 485 individual star-forming galaxies with M$_*$ $>$ 10$^{10}$ M$_{\odot}$ based on deep optical spectra from the VLT/VIMOS LEGA-C survey and multi-band photometry in the COSMOS field. Most importantly, we find that the attenuation curves in the rest-frame $3000-4500$A range are typically almost twice as steep as the Milky Way, LMC, SMC, and Calzetti attenuation curves, which is in agreement with recent studies of the integrated light of present-day galaxies. The attenuation at $4500$A and the slope strongly correlate with the galaxy inclination: face-on galaxies show less attenuation and steeper curves compared to edge-on galaxies, suggesting that geometric effects dominate observed variations in attenuation. Our new method produces $2175$A UV bump detections for 260 individual galaxies. Even though obvious correlations between UV bump strength and global galaxy properties are absent, strong UV bumps are most often seen in face-on, lower-mass galaxies (10 $<$ log$_{10}$(M$_*$/M$_{\odot}$) $<$ 10.5) with low overall attenuation. Finally, we produce a typical attenuation curve for star-forming galaxies at $z\sim0.8$; this prescription represents the effect of dust on the integrated spectral energy distributions of high-redshift galaxies more accurately than commonly used attenuation laws.
