热门
A binary model for the UV-upturn of elliptical galaxies
文献类型：期刊论文
| 作者 | Han ZW(韩占文)1 ; Podsiadlowski, P2; Lynas-Gray, AE2
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2007-09-21 |
| 卷号 | 380期号:3页码:1098-1118 |
| 关键词 | binaries : close subdwarfs galaxies : elliptical and lenticular, cD galaxies : starburst ultraviolet : galaxies |
| ISSN号 | 0035-8711 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Han, Z (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | The discovery of a flux excess in the far-ultraviolet (FUV) spectrum of elliptical galaxies was a major surprise in 1969. While it is now clear that this UV excess is caused by an old population of hot helium-burning stars without large hydrogen-rich envelopes, rather than young stars, their origin has remained a mystery. Here we show that these stars most likely lost their envelopes because of binary interactions, similar to the hot subdwarf population in our own Galaxy. We have developed an evolutionary population synthesis model for the FUV excess of elliptical galaxies based on the binary model developed by Han et al. for the formation of hot subdwarfs in our Galaxy. Despite its simplicity, it successfully reproduces most of the properties of elliptical galaxies with a UV excess: the range of observed UV excesses, both in (1550 - V) and (2000 - V), and their evolution with redshift. We also present colour-colour diagrams for use as diagnostic tools in the study of elliptical galaxies. The model has major implications for understanding the evolution of the UV excess and of elliptical galaxies in general. In particular, it implies that the UV excess is not a sign of age, as had been postulated previously, and predicts that it should not be strongly dependent on the metallicity of the population, but exists universally from dwarf ellipticals to giant ellipticals. |
| 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] | SUBDWARF-B-STARS ; HORIZONTAL-BRANCH STARS ; MASS-RATIO DISTRIBUTION ; EVOLUTIONARY POPULATION SYNTHESIS ; SPECTRAL ENERGY-DISTRIBUTIONS ; FAR-ULTRAVIOLET EMISSION ; PALOMAR-GREEN SURVEY ; EVOLVED STELLAR POPULATIONS ; ABSORPTION-FEATURE INDEXES ; ASYMPTOTIC GIANT BRANCH |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/380/3/1098 |
| 语种 | 英语 |
| WOS记录号 | WOS:000249844900021 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4436]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China 2.Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH |
| 推荐引用方式 GB/T 7714 | Han ZW,Podsiadlowski, P,Lynas-Gray, AE. A binary model for the UV-upturn of elliptical galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,380(3):1098-1118. |
| APA | Han ZW,Podsiadlowski, P,&Lynas-Gray, AE.(2007).A binary model for the UV-upturn of elliptical galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,380(3),1098-1118. |
| MLA | Han ZW,et al."A binary model for the UV-upturn of elliptical galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 380.3(2007):1098-1118. |
入库方式： OAI收割
来源：云南天文台
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。