The Dependence of the IR–Radio Correlation on the Metallicity
文献类型：期刊论文
| 作者 | Qiu,Jianjie2,4; Shi,Yong2,4; Wang,Junzhi3; Zhang,Zhi-Yu1; Zhou,Luwenjia2,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-08-31 |
| 卷号 | 846期号:1 |
| 关键词 | galaxies: dwarf galaxies: ISM infrared: galaxies radio continuum: galaxies |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa832c |
| 英文摘要 | Abstract We have compiled a sample of 26 metal-poor galaxies with 12 + log(O/H) < 8.1 with both infrared continuum and 1.4 GHz radio continuum data. By comparing to galaxies at higher metallicity, we have investigated the IR–radio relationship’s dependence on metallicity at the 24, 70, 100, and 160 μm bands, as well as the integrated FIR luminosity. It is found that metal-poor galaxies have on average lower than metal-rich ones, with larger offsets at longer IR wavelengths, from ?0.06 dex in to ?0.6 dex in . The of all galaxies as a whole at 160 μm show positive trends with the metallicity and IR-to-FUV ratio and negative trends with the IR color, while those at lower IR wavelengths show weaker correlations. We propose a mechanism that invokes the combined effects of low obscured-SFR-to-total-SFR fraction and warm dust temperature at low metallicity to interpret the above behavior of , with the former reducing the IR radiation and the latter further reducing the IR emission at longer IR wavelengths. Other mechanisms that are related to the radio emission, including the enhanced magnetic field strength and increased thermal radio contribution, are unable to reconcile the IR-wavelength-dependent differences of between metal-poor and metal-rich galaxies. In contrast to , the mean total-SFR-to-radio ratio of metal-poor galaxies is the same as that for metal-rich galaxies, indicating the 1.4 GHz radio emission is still an effective tracer of SFRs at low metallicity. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-846-1-AA832C |
| 出版者 | The American Astronomical Society |
| 源URL | [http://119.78.226.72/handle/331011/32111]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK 2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China 4.School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China; yshipku@gmail.com |
| 推荐引用方式 GB/T 7714 | Qiu,Jianjie,Shi,Yong,Wang,Junzhi,et al. The Dependence of the IR–Radio Correlation on the Metallicity[J]. The Astrophysical Journal,2017,846(1). |
| APA | Qiu,Jianjie,Shi,Yong,Wang,Junzhi,Zhang,Zhi-Yu,&Zhou,Luwenjia.(2017).The Dependence of the IR–Radio Correlation on the Metallicity.The Astrophysical Journal,846(1). |
| MLA | Qiu,Jianjie,et al."The Dependence of the IR–Radio Correlation on the Metallicity".The Astrophysical Journal 846.1(2017). |
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来源：上海天文台
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