Unbiased Spectroscopic Study of the Cygnus Loop with LAMOST. I. Optical Properties of Emission Lines and the Global Spectrum
文献类型：期刊论文
| 作者 | Seok, Ji2,3; Koo, Bon-Chul4; Zhao, Gang1,2; Raymond, John C.5 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2020-04-01 |
| 卷号 | 893期号:1页码:22 |
| 关键词 | Supernova remnants Shocks Interstellar line emission |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab800b |
| 英文摘要 | We present an unbiased spectroscopic study of the Galactic supernova remnant (SNR) Cygnus Loop using the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) DR5. LAMOST features both a large field of view and a large aperture, which allow us to simultaneously obtain 4000 spectra at similar to 3700-9000 A with R 1800. The Cygnus Loop is a prototype of middle-aged SNRs, which has the advantages of being bright, large in angular size, and relatively unobscured by dust. Along the line of sight to the Cygnus Loop, 2747 LAMOST DR5 spectra are found in total, which are spatially distributed over the entire remnant. This spectral sample is free of the selection bias of most previous studies, which often focus on bright filaments or regions bright in [O iii]. Visual inspection verifies that 368 spectra (13% of the total) show clear spectral features to confirm their association with the remnant. In addition, 176 spectra with line emission show ambiguity of their origin but have a possible association to the SNR. In particular, the 154 spectra dominated by the SNR emission are further analyzed by identifying emission lines and measuring their intensities. We examine distributions of physical properties such as electron density and temperature, which vary significantly inside the remnant, using theoretical models. By combining a large number of the LAMOST spectra, a global spectrum representing the Cygnus Loop is constructed, which presents characteristics of radiative shocks. Finally, we discuss the effect of the unbiased spectral sample on the global spectrum and its implication to understand a spatially unresolved SNR in a distant galaxy. |
| WOS关键词 | FAST SHOCK-WAVE ; SUPERNOVA-REMNANTS ; X-RAY ; COLLISION STRENGTHS ; NONRADIATIVE SHOCK ; INFRARED-EMISSION ; MAGELLANIC CLOUDS ; SKY SURVEY ; ULTRAVIOLET ; SPECTROPHOTOMETRY |
| 资助项目 | NSFC[11988101] ; NSFC[11650110436] ; NSFC[11890694] ; Chinese Academy of Sciences (CAS) ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning[2017R1A2A2A05001337] ; National Development and Reform Commission |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000528536300001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | NSFC ; NSFC ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning ; National Development and Reform Commission ; National Development and Reform Commission |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55111]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Seok, Ji |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100010, Peoples R China 3.Korea Astron & Space Sci Inst, Daejeon 305348, South Korea 4.Seoul Natl Univ, Seoul 151742, South Korea 5.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA |
| 推荐引用方式 GB/T 7714 | Seok, Ji,Koo, Bon-Chul,Zhao, Gang,et al. Unbiased Spectroscopic Study of the Cygnus Loop with LAMOST. I. Optical Properties of Emission Lines and the Global Spectrum[J]. ASTROPHYSICAL JOURNAL,2020,893(1):22. |
| APA | Seok, Ji,Koo, Bon-Chul,Zhao, Gang,&Raymond, John C..(2020).Unbiased Spectroscopic Study of the Cygnus Loop with LAMOST. I. Optical Properties of Emission Lines and the Global Spectrum.ASTROPHYSICAL JOURNAL,893(1),22. |
| MLA | Seok, Ji,et al."Unbiased Spectroscopic Study of the Cygnus Loop with LAMOST. I. Optical Properties of Emission Lines and the Global Spectrum".ASTROPHYSICAL JOURNAL 893.1(2020):22. |
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来源：国家天文台
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