Pairwise velocity dispersion of galaxies at high redshift: Theoretical predictions
文献类型：期刊论文
| 作者 | Zhao, DH; Jing, YP; Borner, G |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2002-12-20 |
| 卷号 | 581期号:2页码:876-885 |
| 关键词 | cosmology : theory galaxies : high-redshift galaxies : kinematics and dynamics |
| 英文摘要 | We investigate the feasibility of determining the pairwise velocity dispersion (PVD) for Lyman break galaxies (LBGs) and of using this quantity as a discriminator among theoretical models. We find that within a given cosmological model, different schemes of galaxy formation lead to significant changes of the PVD. We propose a simple phenomenological model for the formation of LBGs, determined by the formation interval parameter Delta(z) and the halo mass threshold M-h. With a reasonable choice for these two parameters, our model predicts an occupation number distribution of galaxies in halos that agrees very well with the predictions of semianalytical models. We also consider a range of galaxy formation models by adjusting the two model parameters. We find that model LBGs can have the same two-point correlation function (TPCF) over the range of observable separations, even though the cosmology and/or galaxy formation model are different. Moreover, with similar galaxy formation models, currently popular cosmologies can result in both the same TPCF and the same PVD. However, with the same cosmology, different galaxy formation models may show quite different PVDs, even though the TPCF is the same. Our test with mock samples shows furthermore that one can discriminate among such models already with currently available observational samples ( if the measurement error of the redshift is negligible), which have a typical error of 80 km s(-1). The error will be reduced by a factor of 2 if the samples are increased 4 times. We also show that an erroneous assumption about the geometry of the universe and different infall models only slightly change the results. Therefore, the PVD will become another promising statistic to test galaxy formation models with redshift samples of LBGs. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | LYMAN-BREAK GALAXIES ; HUBBLE-DEEP-FIELD ; DARK-MATTER HALOS ; COSMOLOGICAL CONSTANT ; PECULIAR VELOCITIES ; STAR-FORMATION ; Z-SIMILAR-TO-3 ; EVOLUTION ; STATISTICS ; DENSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000179914300010 |
| 源URL | [http://119.78.226.72/handle/331011/18244]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Astrophys, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Max Planck Inst Astrophys, D-85748 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Zhao, DH,Jing, YP,Borner, G. Pairwise velocity dispersion of galaxies at high redshift: Theoretical predictions[J]. ASTROPHYSICAL JOURNAL,2002,581(2):876-885. |
| APA | Zhao, DH,Jing, YP,&Borner, G.(2002).Pairwise velocity dispersion of galaxies at high redshift: Theoretical predictions.ASTROPHYSICAL JOURNAL,581(2),876-885. |
| MLA | Zhao, DH,et al."Pairwise velocity dispersion of galaxies at high redshift: Theoretical predictions".ASTROPHYSICAL JOURNAL 581.2(2002):876-885. |
入库方式： OAI收割
来源：上海天文台
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