JINGLE V: Dust properties of nearby galaxies derived from hierarchical Bayesian SED fitting
JINGLE V: Dust properties of nearby galaxies derived from hierarchical Bayesian SED fitting
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DOI：
10.1093/mnras/stz2311
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发表时间：
2019-08
影响因子：
4.8
通讯作者：
I. Lamperti;A. Saintonge;I. de Looze;Gioacchino Accurso;C. Clark;Matthew W. L. Smith;C. Wilson
中科院分区：
文献类型：
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作者：
I. Lamperti;A. Saintonge;I. de Looze;Gioacchino Accurso;C. Clark;Matthew W. L. Smith;C. Wilson
我们使用 22-850$\mu$m 范围内的光度数据研究了 JINGLE 巡天中 192 个附近星系的尘埃特性。我们使用单一修正黑体模型 (SMBB) 拟合星系的光谱能量分布 (SED)，得出星系的总尘埃质量、温度 T 和发射率指数 β。我们应用分层贝叶斯方法来减少 T 和 β 之间已知的简并性。应用分层方法，T-β 反相关的强度从皮尔逊相关系数 R = -0.79 降低到 R = -0.52。对于 JINGLE 星系，我们测量了 17 – 30 K 范围内的尘埃温度和 0.6 – 2.2 范围内的尘埃发射率指数 β。我们将 SMBB 模型与破碎发射率修正黑体 (BMBB) 模型和两种修正黑体 (TMBB) 模型进行比较。 SMBB 和 TMBB 得出的结果非常一致，因此应用自由参数较少的 SMBB 不会影响 JINGLE 样品中冷尘特性的测量。我们在 JINGLE 和赫歇尔参考巡天 (HRS) 样本中研究了 T 和 β 以及其他全球星系特性之间的关系。我们发现β与恒星质量表面密度相关（R = 0.62），与HI质量分数（MHI/M*，R = -0.65）反相关，而尘埃温度与由尘埃质量归一化的恒星形成率（R = 0.73）密切相关。这些关系可用于估计星系中的 T 和 β，但光度数据不足，无法通过 SED 拟合直接测量它们。
We study the dust properties of 192 nearby galaxies from the JINGLE survey using photometric data in the 22-850$\mu$m range. We derive the total dust mass, temperature T and emissivity index β of the galaxies through the fitting of their spectral energy distribution (SED) using a single modified black-body model (SMBB). We apply a hierarchical Bayesian approach that reduces the known degeneracy between T and β. Applying the hierarchical approach, the strength of the T-β anti-correlation is reduced from a Pearson correlation coefficient R = −0.79 to R = −0.52. For the JINGLE galaxies we measure dust temperatures in the range 17 − 30 K and dust emissivity indices β in the range 0.6 − 2.2. We compare the SMBB model with the broken emissivity modified black-body (BMBB) and the two modified black-bodies (TMBB) models. The results derived with the SMBB and TMBB are in good agreement, thus applying the SMBB, which comes with fewer free parameters, does not penalize the measurement of the cold dust properties in the JINGLE sample. We investigate the relation between T and β and other global galaxy properties in the JINGLE and Herschel Reference Survey (HRS) sample. We find that β correlates with the stellar mass surface density (R = 0.62) and anti-correlates with the HI mass fraction (MHI/M*, R = −0.65), whereas the dust temperature correlates strongly with the SFR normalized by the dust mass (R = 0.73). These relations can be used to estimate T and β in galaxies with insufficient photometric data available to measure them directly through SED fitting.