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
中科院分区:
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
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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DOI:
10.1088/0004-637x/778/1/51
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The Astrophysical Journal
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DOI:
--
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