arXiv 2203.166552022-03-30astro-ph.GA

$0 < z < 2$尘埃温度的无红移演化

No Redshift Evolution of Dust Temperatures from $0 < z < 2$

Patrick M. Drew, Caitlin M. Casey

备注：: 27 pages, 10 figures. Accepted for publication in the Astrophysical Journal on March 23, 2022
DOI：: 10.3847/1538-4357/ac6270

摘要：

一些最近的文献声称，在星系的尘埃温度朝着温暖（或寒冷）的光谱能量分布（SED）之间的低和高红移的演变。这些结论是由理论模型和实证测量驱动的。这种说法有时相互矛盾，并且容易在样本或SED拟合技术中产生偏差。使直接比较变得困难的是，没有统一的方法来拟合星系的红外/毫米波SED。在这里，我们的目标是标准化的测量星系的尘埃温度与蟒蛇为基础的SED拟合程序，MCIRSED。我们利用IRAS，Herschel和Scuba-2观测到的参考数据集来测试红移演化到$z\sim2$。我们将我们的工作锚定在L $λ_{peak}$平面上，其中根据经验观察到IR发光度和静止帧峰值波长（发光度加权尘埃温度的观测代理）之间存在反相关性，例如$λ_{peak}=λ_{t}({L_{IR}}/{L_{t}})^η$，其中$η=-0.09\pm0.01$、L $_{t}=10^{12}$ L $_{\odot}$和$λ_{t}=92\pm2μ$ m。我们发现没有证据表明红移演化的星系的温度，或$λ_{peak}$，在固定的L $_{IR}$从$0<z<2$与>99.99%的置信度。我们的发现并不排除在固定恒星质量的尘埃温度的演变，这是预期从一个非演变的L $_{IR}$ - $λ_{peak}$关系和一个强烈的演变SFR-M $_\star$关系。在给定的L $_{IR}$中，尘埃温度的宽度很可能是由星系尘埃几何形状和大小的变化所驱动的，并且不会演变。测试L $_{IR}$ - $λ_{peak}$向更高红移（$z\sim5-6$）的演化需要更好地采样星系尘埃SED的峰值附近（观测到的$\sim$ 200-600 $μ$ m）与$<$ 1 mJy的灵敏度。这对当前的仪器构成了重大挑战。

英文摘要：

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.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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