GAMA/H-ATLAS：连接亚毫米检测和未检测的早期型镓的性质：I. z $\le$ 0.06样品
GAMA/H-ATLAS: Linking the Properties of Sub-mm Detected and Undetected Early-Type Galaxies: I. z$\le$0.06 Sample
摘要：
我们提出了两个大的，附近的（0.013 $\le$ z $\le$ 0.06）早期型星系（ETG）的样本：一个视觉分类的样本220 ETG，创建使用源匹配的数据从银河系和质量大会（GAMA）数据库与FIR/亚毫米探测从$Herschel$ -ATLAS;和视觉分类的样本551 ETG是未检测到的$Herschel$ -ATLAS。利用光发射谱线诊断技术从我们的样品中去除了活动星系核。对这些样品进行仔细检查，以确定检测到的亚毫米ETG与未检测到的ETG的特征。我们发现两个ETG样本的恒星质量分布相似，但测试其他属性发现显着差异。被检测到的亚毫米样品的浓度和Sérsic指数低于未被检测到的样品-这可能与前者中存在灰尘有关。光学和紫外光学颜色也显示出更蓝，表明尘埃与最近的恒星形成有关。对于亚毫米检测的ETG，固有有效半径平均大1.5倍。从GAMA数据库的表面密度和组数据进行检查的两个样本，导致的结论是，尘埃ETG居住稀疏的环境比非尘埃ETG在附近的宇宙，虽然环境中最明亮的ETG显示出不同的最少。修正的普朗克函数与H-ATLAS探测到的PACS和SPIRE通量进行拟合，得到的冷尘埃温度T $_{d}$ =22.1K，范围为9- 30 K，其中ETG的亚毫米级通量密度在350 $μ$ m SPIRE波段至少为3 $σ$。相应的平均尘埃质量为1.8 $\times10^{7}$ M $_{\odot}$，范围为（0.08-35.0）$\times10^{7}$ M $_{\odot}$。从这些拟合计算出的尘埃质量，按恒星质量归一化，显示出随着恒星质量的减少和更蓝的颜色而增加。
英文摘要：
We present two large, nearby (0.013$\le$z$\le$0.06) samples of Early-Type Galaxies (ETGs): a visually classified sample of 220 ETGs, created using source-matched data from the Galaxy and Mass Assembly (GAMA) database with FIR/sub-mm detections from $Herschel$-ATLAS; and a visually classified sample of 551 ETGs which are undetected with $Herschel$-ATLAS. Active galactic nuclei (AGN) are removed from our samples using optical emission line diagnostics. These samples are scrutinised to determine characteristics of sub-mm detected versus undetected ETGs. We find similarities in the stellar mass distributions of the two ETG samples but testing other properties uncovers significant differences. The sub-mm detected sample is shown to have lower concentration and Sérsic indices than those in the undetected sample - a result which may be linked to the presence of dust in the former. Optical and UV-optical colours are also shown to be much bluer, indicating that the dust is linked with recent star formation. The intrinsic effective radii are on average 1.5 times larger for the sub-mm detected ETGs. Surface densities and groups data from the GAMA database are examined for the two samples, leading to the conclusion that dusty ETGs inhabit sparser environments than non-dusty ETGs in the nearby universe, although environments of the brightest ETGs are shown to differ the least. Modified Planck functions are fit to the H-ATLAS detected PACS and SPIRE fluxes for ETGs with sub-mm flux densities of at least 3$σ$ in the 350$μ$m SPIRE band, giving a resultant mean cold dust temperature of T$_{d}$=22.1K, with a range of 9-30K. The corresponding mean dust mass is 1.8$\times10^{7}$M$_{\odot}$, with a range of (0.08-35.0)$\times10^{7}$M$_{\odot}$. The dust masses calculated from these fits, normalised by stellar mass, are shown to increase with decreasing stellar mass and bluer colours.
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