Dissecting the Global Cold Dust Properties and Possible Submillimeter Excess of 13 Nearby Spiral Galaxies from the NGLS

Dissecting the Global Cold Dust Properties and Possible Submillimeter Excess of 13 Nearby Spiral Galaxies from the NGLS
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NGLS 剖析全球冷尘埃特性以及附近 13 个螺旋星系可能存在的亚毫米级过量

DOI:
10.3847/1538-4357/aba52f
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发表时间:
2020-08
影响因子:
4.9
通讯作者:
Jun Li
Jun Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhengxue Chang;Jianjun Zhou;Christine D. Wilson;Jarken Esimbek;Jianjie Qiu;Dalei Li;Minhua Zhou;Yuxin He;Weiguang Ji;Xindi Tang;Gang Wu;Jun Li

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我们从邻近星系遗产调查(NGLS)项目中选择了13个邻近螺旋星系,并在全球范围内应用双分量修正黑体模型对每个星系进行光谱能量分布拟合,目的是探索潜在的亚毫米(submm)过剩。我们发现当βc = 2.0时,NGC 2976、NGC 3351和NGC 4631在850 μm处有过量的发射。CO(3-2)、自由-自由辐射或同步辐射的贡献不能解释它们850 μm的过量。我们的研究结果表明,对于红外总光度较弱和冷尘埃质量较低的星系,850 μm的亚毫米过量可能更容易被探测到。冷粉尘温度越低,850 μm处粉尘辐射越大。在恒星质量较低的螺旋星系中很容易检测到亚毫米过量。当星系的金属丰度变差时,亚毫米级的过剩就更加明显。
We select 13 nearby spiral galaxies from the Nearby Galaxies Legacy Survey (NGLS) project and perform spectral energy distribution fitting for each galaxy applying two-component modified blackbody models on a global scale aim to probe the potential submillimeter (submm) excess. We find that NGC 2976, NGC 3351, and NGC 4631 show excess emission at 850 μm when using βc = 2.0. The contributions of CO(3–2), free–free emission or synchrotron radiation cannot explain their 850 μm excess. Our results suggest that a submm excess at 850 μm may be more easily detected for galaxies with faint total infrared luminosity and low cold dust mass. The colder temperature of cold dust, the more radiation of dust there is at 850 μm. The submm excess are prone to be detected in spiral galaxies with low stellar mass. As the metallicity of galaxies become poor, the submm excess is more obvious.
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