The Observed versus Total Population of ULXs
文献类型：期刊论文
| 作者 | Wiktorowicz,Grzegorz3,4; Lasota,Jean-Pierre1,5; Middleton,Matthew2; Belczynski,Krzysztof1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-04-16 |
| 卷号 | 875期号:1 |
| 关键词 | stars: black holes stars: neutron methods: statistical X-rays: binaries |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab0f27 |
| 英文摘要 | Abstract We have analyzed how anisotropic emission of radiation affects the observed sample of ultraluminous X-ray sources (ULXs) by performing simulations of the evolution of stellar populations, employing recent developments in stellar and binary physics, and by utilizing a geometrical beaming model motivated by theory and observation. While ULXs harboring black hole accretors (BH ULXs) are typically emitting isotropically, the majority of ULXs with neutron star accretors (NS ULXs) are found to be beamed. These findings confirm previous assertions that a significant fraction of ULXs are hidden from view due to a substantial misalignment of the emission beam and the line of sight. We find the total number of NS ULXs in regions with constant star formation (SF), solar metallicity, and ages above to be higher than the BH ULXs, although observationally both populations are comparable. For lower metallicities, BH ULX dominate both the total and observed ULX populations. As far as burst SF is concerned, young ULX populations are dominated by BH ULXs, but this changes as the population ages and, post SF, NS ULXs dominate both the observed and total ULX populations. We also compare our simulation output to a previous analytical prediction for the relative ratio of BH to NS ULXs in idealized flux-limited observations and find broad agreement for all but the lowest metallicities. In so doing, we find that in such surveys the observed ULX population should be heavily dominated by black hole systems rather than by systems containing neutron stars. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-875-1-AB0F27 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26012]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland 2.Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; gwiktoro@astrouw.edu.pl 4.School of Astronomy & Space Science, University of the Chinese Academy of Sciences, Beijing 100012, People's Republic of China 5.Institut d’Astrophysique de Paris, CNRS et Sorbonne Université, UMR 7095, 98bis Bd Arago, F-75014 Paris, France |
| 推荐引用方式 GB/T 7714 | Wiktorowicz,Grzegorz,Lasota,Jean-Pierre,Middleton,Matthew,et al. The Observed versus Total Population of ULXs[J]. The Astrophysical Journal,2019,875(1). |
| APA | Wiktorowicz,Grzegorz,Lasota,Jean-Pierre,Middleton,Matthew,&Belczynski,Krzysztof.(2019).The Observed versus Total Population of ULXs.The Astrophysical Journal,875(1). |
| MLA | Wiktorowicz,Grzegorz,et al."The Observed versus Total Population of ULXs".The Astrophysical Journal 875.1(2019). |
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来源：国家天文台
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