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THE VELOCITY FUNCTION IN THE LOCAL ENVIRONMENT FROM Lambda CDM AND Lambda WDM CONSTRAINED SIMULATIONS
文献类型：期刊论文
| 作者 | Zavala, J.1,2; Jing, Y. P.1; Faltenbacher, A.1,2; Yepes, G.5; Hoffman, Y.3; Gottloeber, S.4; Catinella, B.2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-08-01 |
| 卷号 | 700期号:2页码:1779-1793 |
| 关键词 | dark matter Local Group |
| 英文摘要 | Using constrained simulations of the local universe for generic cold dark matter (CDM) and for 1 keV warm dark matter (WDM), we investigate the difference in the abundance of dark matter halos in the local environment. We find that the mass function (MF) within 20 h(-1) Mpc of the Local Group is similar to 2 times larger than the universal MF in the 10(9) - 10(13) h(-1) M(circle dot) mass range. Imposing the field of view of the ongoing Hi blind survey Arecibo Legacy Fast ALFA (ALFALFA) in our simulations, we predict that the velocity function (VF) in the Virgo-direction region (VdR) exceeds the universal VF by a factor of 3. Furthermore, employing a scheme to translate the halo VF into a galaxy VF, we compare the simulation results with a sample of galaxies from the early catalog release of ALFALFA. We find that our simulations are able to reproduce the VF in the 80-300 km s(-1) velocity range, having a value similar to 10 times larger than the universal VF in the VdR. In the low-velocity regime, 35-80 km s(-1), the WDM simulation reproduces the observed flattening of the VF. In contrast, the simulation with CDM predicts a steep rise in the VF toward lower velocities; for V(max) = 35 km s(-1), it forecasts similar to 10 times more sources than the ones observed. If confirmed by the complete ALFALFA survey, our results indicate a potential problem for the CDM paradigm or for the conventional assumptions about energetic feedback in dwarf galaxies. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | FAST ALPHA SURVEY ; WARM DARK-MATTER ; HI SOURCE CATALOG ; TULLY-FISHER RELATION ; LARGE-SCALE STRUCTURE ; VIRGO CLUSTER REGION ; DIGITAL-SKY-SURVEY ; HALO MASS FUNCTION ; SATELLITE GALAXIES ; ELLIPSOIDAL COLLAPSE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268098100071 |
| 源URL | [http://119.78.226.72/handle/331011/19559]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Shanghai Astron Observ, MPA SHAO Joint Ctr Astrophys Cosmol, Shanghai 200030, Peoples R China 2.Max Planck Inst Astrophys, D-85741 Garching, Germany 3.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel 4.Astrophys Inst Potsdam, D-14482 Potsdam, Germany 5.Univ Autonoma Madrid, Grp Astrofis, E-28049 Madrid, Spain |
| 推荐引用方式 GB/T 7714 | Zavala, J.,Jing, Y. P.,Faltenbacher, A.,et al. THE VELOCITY FUNCTION IN THE LOCAL ENVIRONMENT FROM Lambda CDM AND Lambda WDM CONSTRAINED SIMULATIONS[J]. ASTROPHYSICAL JOURNAL,2009,700(2):1779-1793. |
| APA | Zavala, J..,Jing, Y. P..,Faltenbacher, A..,Yepes, G..,Hoffman, Y..,...&Catinella, B..(2009).THE VELOCITY FUNCTION IN THE LOCAL ENVIRONMENT FROM Lambda CDM AND Lambda WDM CONSTRAINED SIMULATIONS.ASTROPHYSICAL JOURNAL,700(2),1779-1793. |
| MLA | Zavala, J.,et al."THE VELOCITY FUNCTION IN THE LOCAL ENVIRONMENT FROM Lambda CDM AND Lambda WDM CONSTRAINED SIMULATIONS".ASTROPHYSICAL JOURNAL 700.2(2009):1779-1793. |
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来源：上海天文台
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