An Ultralong-wavelength Sky Model with Absorption Effect
文献类型：期刊论文
| 作者 | Cong,Yanping1,4; Yue,Bin1; Xu,Yidong1 ; Huang,Qizhi1; Zuo,Shifan1,3; Chen,Xuelei1,2,4
|
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 914期号:2 |
| 关键词 | Radio continuum emission Interstellar emissions Galaxy structure H II regions Extragalactic radio sources |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abf55c |
| 英文摘要 | Abstract The radio sky at frequencies below ～10 MHz is still largely unknown; this remains the last unexplored part of the electromagnetic spectrum in astronomy. The upcoming space experiments aiming at such low frequencies (ultralong wavelengths or ultralow frequencies) would benefit from reasonable expectations of the sky brightness distribution at relevant frequencies. In this work, we develop a radio sky model that is valid down to ～1 MHz. In addition to discrete H ii objects, we take into account the free–free absorption by thermal electrons in the Milky Way’s warm ionized medium. This absorption effect becomes obvious at ?10 MHz, and could make the global radio spectrum turn over at ～3 MHz. Our sky map shows unique features at the ultralong wavelengths, including a darker Galactic plane in contrast to the sky at higher frequencies, and huge shadows of the spiral arms on the sky map. It will be a useful guide for designing future ultralong-wavelength observations. Our Ultralong-wavelength Sky Model with Absorption (ULSA) model can be downloaded at doi:10.5281/zenodo.4454153. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-914-2-ABF55C |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57285]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yue,Bin |
| 作者单位 | 1.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People's Republic of Chinayuebin@nao.cas.cn, xuyd@nao.cas.cn, xuelei@cosmology.bao.ac.cn 2.Center of High Energy Physics, Peking University, Beijing 100871, People's Republic of China 3.Department of Astronomy, Tsinghua University, Beijing 100084, People's Republic of China 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Cong,Yanping,Yue,Bin,Xu,Yidong,et al. An Ultralong-wavelength Sky Model with Absorption Effect[J]. The Astrophysical Journal,2021,914(2). |
| APA | Cong,Yanping,Yue,Bin,Xu,Yidong,Huang,Qizhi,Zuo,Shifan,&Chen,Xuelei.(2021).An Ultralong-wavelength Sky Model with Absorption Effect.The Astrophysical Journal,914(2). |
| MLA | Cong,Yanping,et al."An Ultralong-wavelength Sky Model with Absorption Effect".The Astrophysical Journal 914.2(2021). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。