论文标题
灰尘温度的红移演变从$ 0 <z <2 $
No Redshift Evolution of Dust Temperatures from $0 < z < 2$
论文作者
论文摘要
最近的一些文献声称，在低红移和高红移之间，星系的尘埃温度朝着较温暖（或更冷的）光谱分布（SED）有所发展。这些结论是由理论模型和经验测量所驱动的。这样的说法有时会彼此矛盾，并且容易在样品或SED拟合技术中偏见。使直接比较变得困难的是，没有适合星系的红外/毫米SED的统一方法。在这里，我们旨在通过McIrsed通过基于Python的SED拟合程序来标准化星系的灰尘温度。我们借鉴了IRA，Herschel和Scuba-2观察到的参考数据集，以测试红移进化到$ z \ sim2 $。我们将工作固定到l $ _ {ir} $ - $λ_{peak} $ plane，那里有经验观察到的IR亮度和REST-FRAME峰值波长之间的反相关（观察到亮度降低灰尘温度的观察代理），以至于$λ_{peak} =λ_{t}（{l_ {l_ {ir}}/{l_ {t}}） $λ_{t} = 92 \pm2μ$ m。我们找不到在固定的l $ _ {ir} $ $ 0 <z <z <2 $的情况下，没有> 99.99％的置信度，没有证据表明星系温度的红移演变或$λ_{peak} $。我们的发现并不能排除固定恒星质量处的灰尘温度的演变，这可以从非发展的L $ _ {ir} $ - $λ_{peak} $关系和强劲发展的sfr-m $ $ $ _ \ star $关系。给定的L $ _ {ir} $处的灰尘温度的广度可能是由于星系的尘埃几何形状和尺寸的变化而驱动的，并且不会发展。测试l $ _ {ir} $ - $λ_{peak} $向更高红移（$ z \ sim5-6 $）的演变，需要更好地对星系的灰尘SED在其峰附近（观察到的$ \ sim $ \ sim $ 200-600 $ m m），并具有$ <$ <$ 1 mjy敏感性。这对当前的仪器构成了重大挑战。
Some recent literature has claimed there to be an evolution in galaxies' dust temperatures towards warmer (or colder) spectral energy distributions (SEDs) between low and high redshift. These conclusions are driven by both theoretical models and empirical measurement. Such claims sometimes contradict one another and are prone to biases in samples or SED fitting techniques. What has made direct comparisons difficult is that there is no uniform approach to fitting galaxies' infrared/millimeter SEDs. Here we aim to standardize the measurement of galaxies' dust temperatures with a python-based SED fitting procedure, MCIRSED. We draw on reference datasets observed by IRAS, Herschel, and Scuba-2 to test for redshift evolution out to $z\sim2$. We anchor our work to the L$_{IR}$-$λ_{peak}$ plane, where there is an empirically observed anti-correlation between IR luminosity and rest-frame peak wavelength (an observational proxy for luminosity-weighted dust temperature) such that $λ_{peak}=λ_{t}({L_{IR}}/{L_{t}})^η$ where $η=-0.09\pm0.01$, L$_{t}=10^{12}$ L$_{\odot}$, and $λ_{t}=92\pm2μ$m. We find no evidence for redshift evolution of galaxies' temperatures, or $λ_{peak}$, at fixed L$_{IR}$ from $0<z<2$ with >99.99% confidence. Our finding does not preclude evolution in dust temperatures at fixed stellar mass, which is expected from a non-evolving L$_{IR}$-$λ_{peak}$ relation and a strongly evolving SFR-M$_\star$ relation. The breadth of dust temperatures at a given L$_{IR}$ is likely driven by variation in galaxies' dust geometries and sizes and does not evolve. Testing for L$_{IR}$-$λ_{peak}$ evolution toward higher redshift ($z\sim5-6$) requires better sampling of galaxies' dust SEDs near their peaks (observed $\sim$200-600$μ$m) with $<$1 mJy sensitivity. This poses a significant challenge to current instrumentation.
