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The Star Formation in Radio Survey: 3–33 GHz Imaging of Nearby Galaxy Nuclei and Extranuclear Star-forming Regions
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2020-05-27 , DOI: 10.3847/1538-4365/ab8a4d
S. T. Linden 1 , E. J. Murphy 2 , D. Dong 3 , E. Momjian 4 , R. C. Kennicutt Jr. 5 , D. S. Meier 6 , E. Schinnerer 7 , J. L. Turner 8
Affiliation  

We present 3, 15, and 33 GHz imaging toward galaxy nuclei and extranuclear star-forming regions using the Karl G. Jansky Very Large Array as part of the Star Formation in Radio Survey. With 3–33 GHz radio spectra, we measured the spectral indices and corresponding thermal (free–free) emission fractions for a sample of 335 discrete regions having significant detections in at least two radio bands. After removing 14 likely background galaxies, we find that the median thermal fraction at 33 GHz is 92% ± 0.8% with a median absolute deviation of 11%, when a two-component power-law model is adopted to fit the radio spectrum. Limiting the sample to 238 sources that are confidently identified as star-forming regions and not affected by potential AGN contamination (i.e., having galactocentric radii r G ≥ 250 pc) results in a median thermal fraction of 93% ± 0.8% with a median absolute deviation of 10%. We further measure the thermal fraction at 33 GHz for 163 regions id...

中文翻译:

无线电调查中的恒星形成:附近星系核和核外恒星形成区域的3–33 GHz成像

我们使用Karl G.Jansky超大型阵列作为射电调查中恒星形成的一部分,向星系核和核外恒星形成区域呈现3 GHz,15 GHz和33 GHz成像。利用3–33 GHz的无线电频谱,我们测量了335个离散区域的样本的光谱指数和相应的热(自由-自由)发射分数,这些样本在至少两个无线电频带中具有明显的检测能力。去除14个可能的背景星系后,我们发现,当采用两分量幂律模型拟合无线电频谱时,在33 GHz处的中值热分数为92%±0.8%,中值绝对偏差为11%。将样品限制在238个被确定为恒星形成区域且不受潜在AGN污染影响的来源(即,准中心半径r G≥250 pc)的中值热分数为93%±0.8%,中值绝对偏差为10%。我们进一步测量了163个区域ID在33 GHz时的热分数...
更新日期:2020-05-27
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