Searching for radiative pumping lines of OH masers: II. The 53.3 mu m absorption line towards 1612 MHz OH maser sources
文献类型：期刊论文
| 作者 | He JH(何金华) ; Chen PS(陈培生)
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| 刊名 | NEW ASTRONOMY
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| 出版日期 | 2004-09 |
| 卷号 | 9期号:7页码:545-564 |
| 关键词 | masers stars : AGB and post AGB circumstellar matter supergiants HII regions radio lines : stars |
| ISSN号 | 1384-1076 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | He, JH (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China. |
| 英文摘要 | This is the second paper in a series aiming at searching for infrared pumping lines for galactic 1612 MHz OH masers. Our paper I is devoted to the 34.6 mum absorption lines in ISO SWS spectra towards a large sample of galactic OH/IR sources. This paper analyzes the 53.3 mum line in the ISO LWS spectra towards a similar sample of OH/IR sources. A search with position radius of 1 arcmin in ISO Data Archive (IDA) results in 137 LWS spectra covering 53.3 mum associated with 47 galactic OH/IR sources and 4 ones associated with megamasers Arp 220 and NGC 253. (These two magamasers are included for comparison purpose only.) Ten of these galactic OH/IR sources are found to show and another 5 ones tentatively show the 53.3 mum absorption while another 7 sources (our group U1 and U2 sources) highly probably do not show this line. The source class is found to be correlated with the type of spectral profile: red supergiants (RSGs) and AGB stars tend to show strong blue-shifted filling emission in their 53.3 mum absorption line profiles while H II regions tend to show a weak red-shifted filling emission in the line profile. GC sources and megamasers mainly show symmetrical profile in the line core while megamasers tend to show an additional absorption tail on the blue side of the line profile. It is argued that the filling emission might be the manifestation of an unresolved half emission half absorption profile of the 53.3 mum, doublet which might be produced by the transitions among the two levels: (2)Pi(1/2)(J=3/2) and (2)Pi(1/2)(J=5/2) and their closely related levels. The 53.3 to 34.6 mum equivalent width (EW) ratio is close to unity for RSGs but much larger than unity for GC sources and megamasers while H II regions only show the 53.3 mum line. The pump rate defined as maser to IR photon flux ratio is approximately 5% for RSGs. The pump rates of GC sources are three order of magnitude smaller. Both the large 53.3 to 34.6 mum EW ratio and the small pump rate of the GC OH masers reflect that the two detected 'pumping lines' in these sources are actually of interstellar origin. The pump rate of Arp 220 is 32%-much larger than that of RSGs, which indicates that the contribution of other pumping mechanisms to this megamaser is important. A handful of non-detections of the 34.6 or 53.3 mum line or both can be explained partly by the genuinely weakness of the OH masers and partly by some other mechanisms weakening the IR pumping lines, such as clumpy OH shell or limb filling emission. (C) 2004 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GIANT BRANCH STARS ; IRAS POINT SOURCES ; OH/IR STARS ; LRS SPECTRA ; GALACTIC-CENTER ; EMISSION ; ISO ; OBJECTS ; REGION ; PLANE |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S1384107604000417 |
| 语种 | 英语 |
| WOS记录号 | WOS:000224734500005 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4407]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China |
| 推荐引用方式 GB/T 7714 | He JH,Chen PS. Searching for radiative pumping lines of OH masers: II. The 53.3 mu m absorption line towards 1612 MHz OH maser sources[J]. NEW ASTRONOMY,2004,9(7):545-564. |
| APA | He JH,&Chen PS.(2004).Searching for radiative pumping lines of OH masers: II. The 53.3 mu m absorption line towards 1612 MHz OH maser sources.NEW ASTRONOMY,9(7),545-564. |
| MLA | He JH,et al."Searching for radiative pumping lines of OH masers: II. The 53.3 mu m absorption line towards 1612 MHz OH maser sources".NEW ASTRONOMY 9.7(2004):545-564. |
入库方式： OAI收割
来源：云南天文台
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