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arXiv 2411.04583astro-ph.GA
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确认过去50亿年间星系尘埃质量函数的演化

Confirming the Evolution of the Dust Mass Function in Galaxies over the past 5 Billion Years

R A Beeston, H L Gomez, L Dunne, S Maddox, S A Eales, M W L Smith

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Accepted for publication in MNRAS
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AI总结：

基于H-ATLAS的29,241个星系样本，利用MAGPHYS和叠加分析，确认了尘埃质量函数在过去50亿年的演化，并修正了本地尘埃质量密度。

摘要：

在过去五十亿年的宇宙历史中，星系尘埃含量的演化程度在文献中存在争议。本文基于赫歇尔天体物理太赫兹巡天（H-ATLAS）的数据，对红移范围0<z<0.5的29,241个星系样本进行了远红外尘埃普查。我们使用光谱能量分布拟合工具MAGPHYS和叠加分析，研究了远红外选择的星系的尘埃质量和温度随光度及红移的演化。在低红移处，我们发现叠加分析得到的质量加权和光度加权尘埃温度均呈现出更亮的星系具有更温暖尘埃的趋势。在较高红移区间，我们看到质量加权和光度加权尘埃温度随红移均有一定演化，但该效应在光度加权温度中最为显著。在z<0.1处测量的星系尘埃含量（尘埃质量函数）的形状与使用同一天空区域光学选择的星系得出的形状不同。我们将本地尘埃质量密度（z<0.1）修正为ρ_d = (1.37±0.08)×10^5 M⊙ Mpc⁻³ h₇₀⁻¹，对应于储存在尘埃中的重子（按质量计）总比例为f_mb（尘埃）= (2.22±0.13)×10⁻⁵。我们确认了过去几十亿年间光度密度和尘埃质量密度的演化（ρ_d ∝ (1+z)^{2.6±0.6}），其演化比先前远红外选择研究中观测到的更为平缓。我们将ρ_L和ρ_m的演化归因于尘埃质量的演化。

英文摘要：

The amount of evolution in the dust content of galaxies over the past five billion years of cosmic history is contested in the literature. Here we present a far-infrared census of dust based on a sample of 29,241 galaxies with redshifts ranging from 0 < z < 0.5 using data from the Herschel Astrophysical Terahertz Survey (H-ATLAS). We use the spectral energy distribution fitting tool MAGPHYS and a stacking analysis to investigate the evolution of dust mass and temperature of far-infrared-selected galaxies as a function of both luminosity and redshift. At low redshifts, we find that the mass-weighted and luminosity-weighted dust temperatures from the stacking analysis both exhibit a trend for brighter galaxies to have warmer dust. In higher redshift bins, we see some evolution in both mass-weighted and luminosity-weighted dust temperatures with redshift, but the effect is strongest for luminosity-weighted temperature. The measure of dust content in galaxies at z<0.1 (the Dust Mass Function) has a different shape to that derived using optically-selected galaxies from the same region of sky. We revise the local dust mass density (z<0.1) to $ρ_{\rm d} =(1.37\pm0.08)\times 10^5 {\rm\,M_{\odot}\,Mpc^{-3}}\,h_{70}^{-1}$; corresponding to an overall fraction of baryons (by mass) stored in dust of $f_{\rm mb} {(\rm dust)} = (2.22\pm 0.13) \times 10^{-5}$. We confirm evolution in both the luminosity density and dust mass density over the past few billion years ($ρ_{\rm d} \propto (1+z)^{2.6 \pm 0.6}$), with a flatter evolution than observed in previous FIR-selected studies. We attribute the evolution in $ρ_L$ and $ρ_m$ to an evolution in the dust mass.

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